Text preview for : NEO TV-2115TX Ch.EX-1A1 SM.pdf part of NEO TV-2115TX Ch.EX-1A1
CPU TDA938x/5x (N100)
VIDEO
IF
AUDIO TDA7057AQ (N600)
TONE CONTROL TDA7449 (N650)
CRT DRIVE
hef4053 (N402)
V.O.TDA8356 (N401)
H.O.BU2508DX (V502)
POWER STR-G5653 (N861)
HS817 (N801)
TUNER TDQ-5B6M
Back to : NEO TV-2115TX Ch.EX-1A1 S | Home
FILE NO. SM-CTV-O-160
COLOR TELEVISION
SERVICE MANUAL
MODEL NO. TV-2115TX
CHASSIS NO. EX-1A1
Please read this manual carefully before service
TABLE OF CONTENTS
SPECIFICATIONS··················································································································1
SAFETY INSTRUCTIONS AND MAINTENANCE ········································2
X-RAY RADIATION PRECAUTION ···································································································2
SAFETY PRECAUTION ····················································································································2
PRODUCT SAFETY NOTICE············································································································3
SAFETY SYMBOL DESCRIPTION ···································································································3
MAINTENANCE·································································································································4
ADJUSTMENTS ······················································································································5
SET-UP ADJUSTMENTS···················································································································5
CIRCUIT ADJUSTMENTS ·················································································································8
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION ··············· 14
STRUCTURE BLOCK DIAGRAM··································································································· 14
BLOCK DIAGRAM FOR SUPPLY VOLTAGE SYSTEM ································································· 15
CHASSIS DESCRIPTION··············································································································· 16
SERVICE DATA ···················································································································· 17
TECHNICAL DATA OF KEY ICS····································································································· 17
WAVEFORMS OF KEY POINTS ···································································································· 35
SERVICE DATA OF KEY ICS ········································································································· 37
REPLACEMENT OF PARTS ·········································································································· 41
APPENDIX
1. CIRCUIT DIAGRAM
2. PRINTED CIRCUIT BOARD DIAGRAMS
3. FINAL WIRING DIAGRAM
4. FINAL ASSEMBLY DIAGRAM
SERVICE MANUAL
SPECIFICATIONS
Model Number TV-2115TX
Color system PAL4.43, SECAM, NTSC3.58, NTSC4.43
RF system
Sound system B/G, D/K ,I,M
VHF C1¡«C12 (49.75-85.25MHz, 168.25-216.25MHz)
Receiving UHF C13¡«C57 (471.25-863.25MHz)
channel CATV Z1¡«Z7 (111-167MHz)
Z8¡«Z35 (223-447MHz)
Programs preset 236(0-235)
Antenna input 75¦¸(unbalanced)
Picture tube (Approx.)
406¡Á305mm
Effective screen dimensions
Audio output (THD¡Ü7%) 3W+3W
Power source 110-240V ~, 50/60Hz
Weight (Approx.) 23kg
Dimensions
591¡Á458¡Á503mm
(W¡ÁH¡ÁD) (Approx.)
Rated power consumption 69W
Designs and specifications are subject to change without notice.
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SERVICE MANUAL
INSTRUCTIONS FOR SERVICE SAFETY AND MAINTENANCE
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE ¡° X-RAY RADIATION PRECAUTION¡± ,
¡° SAFETY PRECAUTION¡± AND ¡° PRODUCT SAFETY NOTICE¡± INSTRUCTION BELOW.
X-RAY RADIATION PRECAUTION
1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit
X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any
operating circumstances must not exceed the rated value. When checking the EHT, use the High
Voltage Check procedure in this manual using an accurate EHT voltmeter.
2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY radiation, which
ensures safety during normal operation. To prevent X-ray radiation, the replacement CRT must be
identical to the original fitted as specified in the parts list.
3. Some components used in this TV have safety related characteristics preventing the CRT from
emitting X-ray radiation. For continued safety, replacement component should be made after
referring the PRODUCT SAFETY NOTICE below.
4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of the CRT
anode. So ensure that the maximum EHT voltage does not exceed the rated value after service
and adjustment.
SAFETY PRECAUTION
WARNING: REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when working
on the TV with the back removed.
1.1 Do not attempt to service this TV if you are not conversant with the precautions and procedures for
working on high voltage equipment.
1.2 When handling or working on the CRT, always discharge the anode to the TV chassis before
removing the anode cap in case of electric shock.
1.3 The CRT, if broken, will violently expel glass fragments. Use shatterproof goggles and take extreme
care while handling.
1.4 Do not hold the CRT by the neck as this is a very dangerous practice.
2. It is essential that to maintain the safety of the customer all power cord forms be replaced exactly
as supplied from factory.
3. Voltage exists between the hot and cold ground when the TV is in operation. Install a suitable
isolating transformer of beyond rated overall power when servicing or connecting any test
equipment for the sake of safety.
4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below 35W).
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SERVICE MANUAL
5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke assembly to
avoid electronic gun magnetized and decrement in convergence of the CRT.
6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons,
switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the
original place.
7. Replace blown fuses within the TV with the fuse specified in the parts list.
8. When replacing wires or components to terminals or tags, wind the leads around the terminal
before soldering. When replacing safety components identified by the international hazard symbols
on the circuit diagram and parts list, it must be the company-approved type and must be mounted
as the original.
9. Keep wires away from high temperature components.
PRODUCT SAFETY NOTICE
CAUTION: FOR YOU PROTECTION, THE FOLLOWING PRODUCT SAFETY NOTICE SHOULD BE
READ CAREFULLY BEFORE OPERATING AND SERVICING THIS TV SET.
1. Many electrical and mechanical components in this chassis have special safety-related
characteristics. These characteristics are often passed unnoticed by a visual inspection and the
X-ray radiation protection afforded by them cannot necessarily be obtained by using replacements
rated at higher voltages or wattage, etc. Components which have these special safety
characteristics in this manual and its supplements are identified by the international hazard
symbols on the circuit diagram and parts list. Before replacing any of these components read the
parts list in this manual carefully. Substitute replacement components which do not have the same
safety characteristics as specified in the parts list may create X-ray radiation.
2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.
3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so may result
in too large load, causing fire.
4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from being
walked on, modified, cut or pinched, particularly at plugs.
5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do not install
the TV near any heat sources such as radiators, heat registers, stove, or other apparatus that
produce heat.
6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use and
servicing of this TV set. Otherwise, the resulted damage is not protected by the manufacturer.
SAFETY SYMBOL DESCRIPTION
The lightning symbol in the triangle tells you that the voltage inside this product may be
strong enough to cause an electric shock. Extreme caution should be exercised when
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SERVICE MANUAL
working on the TV with the back removed.
This is an international hazard symbol, telling you that the components identified by the
symbol have special safety-related characteristics.
FDA This symbol tells you that the critical components identified by the FDA marking have
special safety-related characteristics.
UL This symbol tells you that the critical components identified by the UL marking have
special safety-related characteristics.
C UL This symbol tells you that the critical components identified by the C-UL marking have
been evaluated to the UL and C-UL standards and have special safety-related
characteristics.
VDE This symbol tells you that the critical components identified by the VDE marking have
special safety-related characteristics.
MAINTENANCE
1. Install the TV set on a stable and level surface. Do not place the set near or over a radiator or heat
register, or where it is exposed to direct sunlight.
2. Do not install the TV set in a place exposed to rain, water, excessive dust, mechanical vibrations or
impacts.
3. Allow enough space (at least 10cm) between the TV and wall or enclosures for proper ventilation.
4. Slots and openings in the cabinet should never be blocked by clothes or other objects.
5. Please power off the TV set and disconnect it from the wall immediately if any abnormal condition
are met, such as bad smell, belching smoke, sparkling, abnormal sound, no picture/sound/raster.
Hold the plug firmly when disconnecting the power cord.
6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft cloth for
cleaning the exterior of the TV set or CRT screen. Do not use liquid cleaners or aerosol cleaners.
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SERVICE MANUAL
ADJUSTMENTS
SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new picture
tube is installed.
Perform the adjustments in the following order:
1. Color purity
2. Convergence
3. White balance
Notes:
¢Ù The purity/convergence magnet assembly and rubber wedges need mechanical positioning.
¢Ú For some picture tubes, purity/ convergence adjustments are not required.
1. Color Purity Adjustment
Preparation:
Before starting this adjustment, adjust the vertical sync, horizontal sync, vertical amplitude and
focus.
1.1 Face the TV set north or south.
1.2 Connect the power plug into the wall outlet and turn on the main power switch of the TV set.
1.3 Operate the TV for at least 15 minutes.
1.4 Degauss the TV set using a specific degaussing coil.
1.5 Set the brightness and contrast to maximum.
1.6 Counter clockwise rotate the R/B low brightness potentiometers to the end and rotate the green low
brightness potentiometer to center.
1.7 Receive green raster pattern signals.
1.8 Loosen the clamp screw holding the deflection yoke assembly and slide it forward or backward to
display a vertical green zone on the screen. Rotate and spread the tabs of the purity magnet
around the neck of the CRT until the green zone is located vertically at the center of the screen.
1.9 Slowly move the deflection yoke assembly forward or backward until a uniform green screen is
obtained.
1.10 Tighten the clamp screw of the assembly temporarily. Check purity of the red raster and blue raster
until purities of the three rasters meet the requirement.
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SERVICE MANUAL
Dummy Wedge
Deflection Coil
Rubber Wedge
Adhesive
Purity/Convergence
Magnet Module Deflection Yoke
Glass Cloth Tapes
Fig. 1
6-pole Magnet
Fixed
4-pole Magnet
Adjust the Angle (Vertical Lines)
Rotate Two Tabs At the
Same Time (Horizontal Lines)
Purity Magnet Adjustment of Magnets
Convergence Magnet Assembly
Fig. 2
2. Convergence Adjustment
Preparation:
Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes.
2.1 Center convergence adjustment
2.1.1 Receive dot pattern.
2.1.2 Adjust the brightness/contrast controls to obtain a sharp picture.
2.1.3 Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue
vertical lines are superimposed each other on the center of the screen.
2.1.4 Turn both tabs at the same time keeping the angle constant to superimpose red and blue
horizontal on the center of the screen.
2.1.5 Adjust two tabs of the 6-pole magnet to superimpose red/blue line and green line.
2.1.6 Remember red and blue movement. Repeat steps2.1.3¡« 2..1.5 until optimal convergence is
6
SERVICE MANUAL
obtained.
2.2 Circumference convergence adjustment
2.2.1 Loosen the clamp screw holding the deflection yoke assembly and allow it tilting.
2.2.2 Temporarily put the first wedge between the picture tube and deflection yoke assembly. Move
front of the deflection yoke up or down to obtain better convergence in circumference. Push the
mounted wedge in to fix the yoke temporarily.
2.2.3 Put the second wedge into bottom.
2.2.4 Move front of the deflection yoke to the left or right to obtain better convergence in
circumference.
2.2.5 Fix the deflection yoke position and put the third wedge in either upper space. Fasten the
deflection yoke assembly on the picture tube.
2.2.6 Detach the temporarily mounted wedge and put it in either upper space. Fasten the deflection
yoke assembly on the picture tube.
2.2.7 After fastening the three wedges, recheck overall convergence and ensure to get optimal
convergence. Tighten the lamp screw holding the deflection yoke assembly.
BLU Red Red/BLU
BLU Red/BL
Red U
4-pole Magnet Movement 6-pole Magnet
Movement
Incline the Yoke up (or down) Incline the Yoke Right(or left)
Circumference Convergence by DEF Yoke
Fig. 3
3. White Balance Adjustment
Generally, white balance adjustment is made with professional equipment. It's not practical to get
good white balance only through manual adjustment. For TVs with I2C bus control, change the bus
data to adjust white balance.
7
SERVICE MANUAL
CIRCUIT ADJUSTMENTS
Preparation:
Circuit adjustments should be made only after completion of set-up adjustments.
Circuit adjustments can be performed using the adjustable components inside the TV set. For TVs with
I2C bus control, first change the bus data.
1. Degaussing
A degaussing coil is built inside he TV set. Each time the TV is powered on, the degaussing coil will
automatically degauss the TV. If the TV is magnetized by external strong magnetic field, causing
color spot on the screen, use a specific degausser to demagnetize the TV in the following ways.
Otherwise, color distortion will be shown on the screen.
1.1 Power on the TV set and operate it for at least 15 minutes.
1.2 Receive red full-field pattern.
1.3 Power on the specific degausser and face it to the TV screen.
1.4 Turn on the degausser. Slowly move it around the screen and slowly take it away from the TV.
1.5 Repeat the above steps until the TV is degaussed completely.
2. Supply Voltage Adjustment
Caution: +B voltage has close relation to high voltage. To prevent X-ray radiation, set +B voltage to
the rated voltage.
2.1 Make sure that the supply voltage is within the range of the rated value.
2.2 Connect a digital voltmeter to the +B voltage output terminal of the TV set. Power on the TV and set
the brightness and sub-brightness to minimum.
2.3 Regulate voltage adjustment components on the power PCB to make the voltmeter read 115±1V.
3. High Voltage Inspection
Caution: No high voltage adjustment components inside the chassis. Please perform high voltage
inspection in the following ways.
3.1 Connect a precise static high voltmeter to the second anode (inside the high voltage cap) of the
picture tube.
3.2 Plug in the supply socket (110-240V, AC, 50/60Hz) and turn on the TV. Set the brightness and contrast
to minimum (0¦ÌA).
3.3 The high voltage reading should be less than the EHT limitation.
3.4 Change the brightness from minimum to maximum, and ensure high voltage not beyond the
limitation in any case.
Nominal EHT voltage: 26.5¡À1.5KV
Limited EHT voltage: 27.5KV(For LG or Seg Hitachi CRT) or 29.5KV(For others)
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the
FBT.
4.2 Power on the TV and preheat it for 15 min.
8
SERVICE MANUAL
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit
current of 10mA) between all naked metal and cold ground. Test every point for 3 min. and ensure
no arcing and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be infinity
with a DC-500 high resistance meter and insulation resistance between the naked metal and
degaussing coil to be over 20M¦¸ .
6. DESIGN/SERVICE mode
6.1 To enter the USER SERVICE mode
Caution: The user service mode adjustment can be changed only when service personnel adjust
the whole set data during servicing. As the control data have dramatic effects on functions and
performance of the TV, service personnel should not tell user how to
enter the SERVICE mode to avoid improper data settings. S
6.1.1 Set the volume to 0. Then press and hold the MUTE button on VS 0-3F 25
the remote control, and press the MENU button on the TV to xxxxxxxx
enter the SERVICE mode. (In this case, the S mode cannot be
stored in the EEPROM. To exit from the S mode, turn off the TV set. )
6.1.2 After entering the S mode, Red ¡° S¡± is displayed on the upper center of the screen and MENU1
is default. Use the POS+/- buttons to highlight an adjustment and the VOL+/- buttons to adjust
it. The adjusted data are immediately output and stored in the EEPROM
6.2 Bus data in the S mode
Item Adjustment Description Remarks
CORE 03 Coring (for some CPU only)
0-IF 20 Sound adjustment setting (for some CPU only)
5PAR/6P
1F Parallelogram correction (for large-screen only)
AR
5BOW/6
1F Curve correction (for large-screen only)
BOW
Horizontal center in the TV mode for 50Hz/60Hz
5HSH/6H Set to the
For 50Hz, ¡° 5HSH¡± is displayed for 60Hz, ¡°
£» 6HSH¡± *
SH optimal mode
is displayed.
5EWW/6
1F East-West correction (for large-screen only)
EWW
5EWP/6 East-West parabola correction (for large-screen
1F
EWP only)
(continued)
9
SERVICE MANUAL
5UCR/6 Upper corner parabola correction (for large-screen
1F
UCR only)
5LCR/6L Lower corner parabola correction (for large-screen
1F
CR only)
5EWT/6
1F Trapezoidal correction (for large-screen only)
EWT
5VSL/6V
1F Vertical slope (for large-screen only) *
SL
5VAM/6V Vertical amplitude; For 50Hz, ¡° 5VAM¡± is displayed£»
1F *
AM for 60Hz, ¡° 6VAM¡± is displayed.
5SCL/6S Set to the
S correction *
CL optimal mode
Vertical center in the TV mode for 50Hz/60Hz. For
5VSH/6V Set to the
50Hz, ¡° 5VSH¡± is displayed£» for 60Hz, ¡° 6VSH¡± is *
SH optimal mode
displayed.
5VOF/6V Set to the
OSD vertical center *
OF optimal mode
VX 19 Vertical zoom (for large-screen only)
RED 20 Red gun cutoff voltage *
GRN 20 Green gun cutoff voltage *
WPR 1F Red gun drive voltage *
WPG 1F Green gun drive voltage *
WPB 1F Blue gun drive voltage *
YDFP/Y
07 PAL brightness delay time/ NTSC brightness delay time
DFN
TOP 10-1F UOC AGC *
TV audio output power can be adjusted by means of
UOC audio output amplitude. Generally, UOC audio
output amplitude is set to 26 for 21" models with stereo
VOL 26 *
output of 3W+3W; 2C for 21" models with stereo output
of 5W+5W; 24 for 14" models with mono output of
2WX2; 22 for 14" models with mono output of 1WX2.
IFFS 03£¨ 02£© PIF (02-38.9MHz, 03-38MHz)
HDOL 00-07 Cathode drive level (typical: 04-07)
AGC 03 IF ACG speed
VG2 brightness setting(VG2B): 3A for 21" models;
2E for 14" models;
Contrast Max. setting (MCON): 30 for 21" Malaysia
VG2B 3A
Matsushita or BMCC CRT with ferrite mask;
MCON: 30; VG2B: 30, HDOL: 04 for 21" Chunghwa
CRT
(continued)
10
01
SERVICE MANUAL
SBRI 1F Sub brightness
MBRI 30 Brightness Max.
SCON 20 Sub contrast
MCON 39 Contrast Max.
SCOL 32 Sub color
OP1 CF Option set byte 1 *
OP2 09 Option set byte 2 *
OP3 FF Option set byte 3 *
OP4 F6 Option set byte 4 *
OP5 76 Option set byte 5 *
OP6 7C Option set byte 6 *
INIT EEPROM initialization
VG2 Adjusting screen voltage with VG2
VSD Vertical output off
STS0/1/2 System status byte
Notes:
¢Ù The data marked with ¡° *¡± have been adjusted in the MANUFACTURE mode. Take care when in
service and adjustment.
¢Ú To write in logo, use the ¡ý /¡ü buttons to highlight an adjustment and the ¡û /¡ú buttons to adjust.
¢Û The data sheet may differ dependent on different models.
¢Ü The data sheet may differ dependent on different CRTs for the same model.
6.3 Option set
With remote control system software TDA935X, all options can be set in the SERVICE mode and
stored in EEPROM. Data related to picture, sound and geometric adjustment are also stored in
EEPROM.
Function Option Bit Setting
Bit Item Description Data
0 OP_HOTEL 1
1 OP_236 1
2 OP_NTSC NTSC color system options: 1: Yes, 0: No 1
Two sets of AV inputs: 1: Two sets of separate AV inputs
3 OP_AV2
OP1 0£º Two sets of parallel AV inputs or one set of AV inputs 1/0
4 OP-SVSH S-Video terminal: 1: Yes, 0: No 1
5 OP-DVD DVD component input: 1: Yes 1
6 OP-RGB RGB input: 1: Yes, 0: No 1
7 OP-OSO 1
(continued)
11
SERVICE MANUAL
0 OP_AVL 1
AV RF output: 1: RF output (for models with SCART jack
1 OP_RFTOAV except EX-1A) 0/1
0: Monitor output (for models with RCA jack)
2 OP_NOT_1 Teletext language setting (OP-NOT-3/2/1): 0
3 OP_NOT_2 1XX-English/Arabic 0
011-English/Farsi
OP2
010-English/Russian
4 OP_NOT_3 0
001-English/Ukrainian
000- English/Paneuro
OP_USER-LOG
5 0
O
6 OP_ON-BLACK 0
7 OP_FSL 0
0 OP_ENGLISH English 1
1 OP_FARSI Farsi or Czech 1
2 OP_ARABIC Arabic or Slovakian 1
3 OP_RUSSIAN Russian 1
OP3
4 OP_FRENCH French 1
5 OP_GERMAN German 1
6 OP_ITALY Italian, Indonesian or Hungarian 1
7 OP_SPANISH Spanish, Malay or Croatian 1
0 OP_FMWS 0
OP_DIRECT_SW
1
1 ITCH_ON
2 OP_HCO 1
3 OP_LOGO 0
4 OP_SOUND_DK Sound system-D/K option setting 1
OP4
5 OP_SOUND_BG Sound system-B/G option setting 1
6 OP_SOUND_I Sound system-I option setting 1
7 OP_SOUND_M Sound system-M option setting 1
OP5
0 OP_TUNER 0
(continued)
12
SERVICE MANUAL
OP_AUTO_LAN Outgoing language option setting:
1 0
G0 (OP-AUTO-LANG2/1/0):
OP_AUTO_LAN English (000)
2 0
G1 Farsi (001)
Arabic (010)
Russian (011)
OP_AUTO_LAN French (100)
3 0
G2 German (101)
Italian or Indonesian (110)
Spanish or Malay (111)
4 OP_FORF 1
5 OP_FORS 1
6 OP_AVON 1
OP_ONPOSITIO
7 0
N
0 OP_AUTOTEST Auto test when power-on (set to 0 typically) 0
1 OP_PSNS 0
2 OP_BSCREEN 1
3 OP_SECAM SECAM color system option: 1: Yes 1
4 OP_DFL 1
5 OP_SIF External SIF amplifier: 1: Yes, 0: No 1
OP6 6 OP_EXT_SIF0 Sound system options for external circuit 1
(OP-EXT-SIF1/0):
D/K: 00£¬ B/G: 01£¬ I: 10£¬ M: 11.
1: Sets sound system of external SIF as the appropriate
7 OP_EXT_SIF1 0
one and also sets sound system in the course of auto
demo as the appropriate one
0: Changes sound system in the course of auto demo.
Notes:
¢Ù Do not change the data marked with ¡° ¡± in ¡° Data¡± column.
13
SERVICE MANUAL
STRUCTURE AND CHASSIS FUNCTION DESCRIPTION
1. STRUCTURE BLOCK DIAGRAM
From
Antenna IF Pre-
Tuner Amplifier Analog Switc h Audio/Video
A101 + HEF4053 Input/Output
SAWF
Band 1,2
Vt,AGC
EEPROM IIC BUS
AT24C08
R CRT
Video
Microcontroller and small signal processor G Amplifier
Formed of
Rem ote UOC
R em ote CH05T0106 B VY01-VY09
Sensor
c on t rol HS0038
Circui for
Buttons On
The TV
Audio
Input Audio Prec essor V.OUT
H.Drive
TDA7449 TDA8356J
Audio Amp lifier
TDA7057AQ FBT
H.OUT
T402
+115V
110-240V~,50/60Hz Power Supply Circuit
R
STR-F6654 or +15V
STR-G5653
Speaker
+5V-1 +3.3V
L
Fig.4 S t r u c t u r e B l o c k D i a g r a m f o r E X - 1 A 1 C h a s s i s S e r i e s
14
SERVICE MANUAL
2. BLOCK DIAGRAM FOR SUPPLY VOLT-AGE SYSTEM
VD491 +190V
To CRT RGB PCB
VD451 +45V
To A100,N401
FBT VD461 +16V
T400 To N401
VD471
+8V To A100,
N442 N100,
+115V N650
VD891
VD871 +15-S
+5V-2
N441 To A100
Bridge Rectifying To N600
Power Regulat ion Switch
Filter
and Control Circuit Transformer
VD803~VD806 VD881 +15V-H
STR-G5653/F6654 T804
C802,C807
Regulator
Line Filter
Feedback Circuit V115
L801,C801,
N801
C802
To H Out
EEPROM
+5V-1 R/C Input
Error Signal +3.3V
Regulator
V871, To N100
VD882 Keyboard
110-240V~,50/60Hz
Fig .5 Block Diagram for EX-1A1 Supply Voltage System
15
SERVICE MANUAL
3. CHASSIS DESCRIPTION
1). General Description
EX-1A1 chassis series are applied in TV-2115TX respectively which uses mainly Philips'
advanced UOC-ultimate chip TDA935X/6X/8X and I2C-bus controlled IC. With combination of
microcontroller and small signal processor, the TDA935X/6X/8X series feature high-integration,
high-performance-to-price ratio and high-reliability and advanced functions with fewer external
components, which provide much convenience for manufacturing and technical service.
2). The EX-1A1chassis series mainly use the following ICs and assemblies.
Table 1 Key ICs and Assemblies
Serial Position Type Function Description
No.
1 N100 TDA935X/6X/8X Microcontroller and small signal processor(UOC)
(CH05T0106)
2 N200 AT24C08 EEPROM
3 N650 TDA7449 Audio processor
4 N401 TDA8356/N6 Vertical scan output stage circuit
5 N600 TDA7057AQ Sound power amplifier
6 N861 STR-G5653/F6654 Power supply circuit
7 N402 HEF4053 Analog switch
8 A100 TDQ-5B6M Tuner
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SERVICE MANUAL
SERVICE DATA
1. KEY ICS TECHNICAL DATA
1.1 Microcontroller and small signal processor TDA935X/6X/8X
The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are shown
as follows.
TDA9351£¨ 48K£© PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350£¨ 48K£© PAL/NTSC+1 PAGE TELETEST
TDA9361£¨ 64K£© PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360£¨ 64K£© PAL/NTSC+10 PAGE TELETEST
TDA9380£¨ 32K£© PAL/NTSC
TDA9387£¨ 32K£© NTSC
TDA935X/6X/8X PS/N2 series TV signal processor-Teletext decoder with embedded
¡ -Controller
1) General Descripion
The various versions of theTDA935X/6X/8X PS/N2 series combine the functions of a TV signal
processor together with a ¡ -Controller and US Closed Caption decoder. Most versions have a
Teletext decoder on board. The Teletext decoder has an internal RAM memory for 1or 10 page text.
The ICs are intended to be used in economy television receivers with 90¡ and 110 picture tubes.
¡ ¡ ¡
The ICs have supply voltages of 8 V and 3.3 V and they are mounted in S-DIP envelope with 64
pins.
The features are given in the following feature list. The differences between the various ICs are
given in the table on page 4.
2) Features
TV-signal processor
¡ñ Multi-standard vision IF circuit with alignment-free PLL demodulator
¡ñ Internal (switchable) time-constant for the IF-AGC circuit
¡ñ A choice can be made between versions with mono intercarrier sound FM demodulator and
versions with QSS IF amplifier.
¡ñ The mono intercarrier sound versions have a selective FM-PLL demodulator which can be switched
to the different FM sound frequencies (4.5/5.5/6.0/6.5 MHz).
The quality of this system is such that the external band-pass filters can be omitted.
¡ñ Source selection between `internal' CVBS and external CVBS or Y/C signals
¡ñ Integrated chrominance trap circuit
¡ñ Integrated luminance delay line with adjustable delay time
¡ñ Picture improvement features with peaking (with variable centre frequency and positive/negative
overshoot ratio) and black stretching
¡ñ Integrated chroma band-pass filter with switchable centre frequency
¡ñ Only one reference (12 MHz) crystal required for the
¡ñ -Controller, Teletext- and the colour decoder
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SERVICE MANUAL
¡ñ PAL/NTSC or multi-standard colour decoder with automatic search system
¡ñ Internal base-band delay line
¡ñ RGB control circuit with `Continuous Cathode Calibration', white point and black level offset
adjustment so that the colour temperature of the dark and the light parts of the screen can be
chosen independently.
¡ñ Linear RGB or YUV input with fast blanking for external RGB/YUV sources. The Text/OSD signals
are internally supplied from the ¡ -Controller/Teletext decoder
¡ñ Contrast reduction possibility during mixed-mode of OSD and Text signals
¡ñ Horizontal synchronization with two control loops and alignment-free horizontal oscillator
¡ñ Vertical count-down circuit
¡ñ Vertical driver optimized for DC-coupled vertical output stages
¡ñ Horizontal and vertical geometry processing
¡ñ Horizontal and vertical zoom function for 16 : 9 applications
¡ñ Horizontal parallelogram and bow correction for large screen picture tubes
¡ñ Low-power start-up of the horizontal drive circuit
TV signal processor-Teletext decoder with embedded ¡ -Controller TDA935X/6X/8X PS/N2
series
¡ñ -Controller
¡ñ 80C51 ¡ -controller core standard instruction set and timing
¡ñ 1 ¡ s machine cycle
¡ñ 16 - 128Kx8-bit late programmed ROM
¡ñ 3 - 12Kx8-bit DATA RAM (shared between Display, Acquisition and Auxiliary Ram)
¡ñ Interrupt controller for individual enable/disable with two level priority
¡ñ Two 16-bit Timer/Counter registers
¡ñ One 16 bit Timer with 8-bit Pre-scaler
¡ñ WatchDog timer
¡ñ Auxiliary RAM page pointer
¡ñ 16-bit Data pointer
¡ñ Stand-by, Idle and Power Down (PD) mode
¡ñ 14 bits PWM for Voltage Synthesis Tuning
¡ñ 8-bit A/D converter
¡ñ 4 pins which can be programmed as general I/O pin, ADC input or PWM (6-bit) output
Data Capture
¡ñ Text memory for 0, 1 or 10 pages
¡ñ In the 10 page versions inventory of transmitted Teletext pages stored in the Transmitted Page
Table (TPT) and Subtitle Page Table (SPT)
¡ñ Data Capture for US Closed Caption
¡ñ Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit
decoding
¡ñ Automatic selection between 525 WST/625 WST
¡ñ Automatic selection between 625 WST/VPS on line 16 of VBI
¡ñ Real-time capture and decoding for WST Teletext in Hardware, to enable optimized ¡ -processor
throughput
18
SERVICE MANUAL
¡ñ Automatic detection of FASTEXT transmission
¡ñ Real-time packet 26 engine in Hardware for processing accented, G2 and G3 characters
¡ñ Signal quality detector for video and WST/VPS data types
¡ñ Comprehensive teletext language coverage
¡ñ Full Field and Vertical Blanking Interval (VBI) data capture of WST data
Display
¡ñ Teletext and Enhanced OSD modes
¡ñ Features of level 1.5 WST and US Close Caption
¡ñ Serial and Parallel Display Attributes
¡ñ Single/Double/Quadruple Width and Height for characters
¡ñ Scrolling of display region
¡ñ Variable flash rate controlled by software
¡ñ Enhanced display features including overlining, underlining and italics
¡ñ Soft colours using CLUT with 4096 colour palette
¡ñ Globally selectable scan lines per row (9/10/13/16) and character matrix [12x10, 12x13, 12x16
(VxH)]
¡ñ Fringing (Shadow) selectable from N-S-E-W direction
¡ñ Fringe colour selectable
¡ñ Meshing of defined area
¡ñ Contrast reduction of defined area
¡ñ Cursor
¡ñ Special Graphics Characters with two planes, allowing four colours per character
¡ñ 32 software redefinable On-Screen display characters
¡ñ 4 WST Character sets (G0/G2) in single device (e.g. Latin, Cyrillic, Greek, Arabic)
¡ñ G1 Mosaic graphics, Limited G3 Line drawing characters
¡ñ WST Character sets and Closed Caption Character set in single device
Functional Difference Between The Various IC Versions
IC Version (TDA) 9350 9351 9352 9353 9360 9361 9362 9363 9364 9365 9366 9367 9380 9381 9382
9383 9384 9385 9386 9387 9388 9389
3) Block Diagram
19
3) Block Diagram
20
SERVICE MANUAL
Fig.6 Block Diagram for TDA935×/6×8×PS/N2 with Mono Intercarrier Sound Demodulator
21
SERVICE MANUAL
Fig.7 Block Diagram for TDA935×/6×8×PS/N2 with QSS IF Sound Channel
SERVICE MANUAL
4) pinning
SYMBOL PIN DESCRIPTION
P1.3/T1 1 port 1.3 or Counter/Timer 1 input
P1.6/SCL 2 port 1.6 or I2C-bus clock line
P1.7/SDA 3 port 1.7 or I2C-bus data line
P2.0/TPWM 4 port 2.0 or Tuning PWM output
P3.0/ADCO/PWMO 5 port 3.0 or ADC0 input or PWM0 output
P3.1/ADC1/PWM1 6 port 3.1 or ADC1 input or PWM1 output
P3.2/ADC1/PWM2 7 port 3.2 or ADC2 input or PWM2 output
P3.3/ADC3/PWM3 8 port 3.3 or ADC3 input or PWM3 output
VSSC/P 9 digital ground for ¦Ì -Controller core and periphery
P0.5 10 port 0.5 (8mA current sinking capability for direct drive of LEDs)
P0.6 11 port 0.6 (8mA current sinking capability for direct drive of LEDs)
VSSA 12 analog ground of Teletext decoder and digital ground of TV-processor
SECPLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor (+8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 phase-2 filter
PH1LF 17 phase-1 filter
GND3 18 ground 3 for TV-processor
DECBG 19 bandgap decoupling
AVL/EWD(1) 20 Automatic Volume Levelling/East-West drive output
VDRB 21 vertical drive B output
VDRA 22 vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 reference current input
VSC 26 vertical sawtooth capacitor
TUNERAGC 27 tuner AGC output
AUDEEM/SIFIN1(1) 28 audio deemphasis or SIF input 1
DECSDEM/SIFIN2(1) 29 decoupling sound demodulator or SIF input2
GND2 30 ground 2 for TV processor
SNDPLL/SIFAGC(1) 31 narrow band PLL filter/AGC sound IF
AVL/SNDIF/REFO/ Automatic Volume Levelling/sound IF input/subcarrier reference
32
AMOUT(1) output/AM output
HOUT 33 (non controlled)
FBISO 34 horizontal output
AUDEXT/ flyback input/sand castle output
35
QSSO/AMOUT(1)
EHTO external audio input/QSS intercarrier out/AM audio output (non
36
controlled)
PLLIF 37 EHT/overvoltage protection input
IFVO/SVO 38 IF-PLL loop filter
VP1 39 IF video output/selected CVBS output
CVBSINT 40 main supply voltage TV-processor (+8V)
GND1 41 internal CVBS input
CVBS/Y 42 ground 1 for TV-processor
CHROMA 43 external CVBS/Y input
AUDOUT/AMOUT(1) 44 chrominance input (SVHS)
INSSW2 45 2nd RGB/YUV insertion input
R2/VIN 46 2nd R input/V (R-Y) input
G2/YIN 47 2nd G input/U input
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SERVICE MANUAL
SYMBOL PIN DESCRIPTION
B2/UIN 48 2nd B input/U (B-Y) input
BCLIN 49 beam current limiter input/(V-guard input, note2)
BLKIN 50 black current input/(V-guard input, note2)
RO 51 Red output
GO 52 Green output
BO 53 Blue output
VDDA analog supply of Teletext decoder and digital supply of TV-processor
54
(3.3V)
VPE 55 OTP programming Voltage
VDDC 56 digital supply to core (3.3V)
OSCGND 57 oscillator ground supply
XTALIN 58 crystal oscillator input
XTALOUT 59 crystal oscillator output
RESET 60 reset
VDDP 61 digital supply to periphery (+3.3V)
P1.0/INT1 62 port 1.0 or external interrupt 1 input
P1.1/TO 63 port 1.1 or Counter/Timer 0 input
P1.2/INTO 64 port 1.2 or external interrupt 0 input
Notes
1)The function of pin 20, 28, 29, 31, 32, 35 and 44 is dependent on the IC version (mono intercarrier
FM demodulator/QSS IF amplifier and East-West output or not) and on some software control bits.
The valid combinations are given in table 2.
2)The vertical guard function can be controlled via pin 49 or pin 50. The selection is made by means of
the IVG bit in subaddress 2BH.
Table 2 Pin functions for various versions
IC version FM-PLL Version QSS Version
East-West
N Y N Y
Y/N
CMB1/CM
00 01/10/11 00 01/10/11 00 01/10/11 00 01/10/11
BO bits
AM bit - - - - - 0 1 - 0 1
Pin 20 AVL EWD AVL EWD
Pin 28 AUDEEM SIFIN1
Pin 29 DECSDEM SIFIN2
Pin 31 SNDPLL SIFAGC
(1) (2) (1) (2) (2) (2)
Pin 32 SNDIR REFO AVL/SNDIF REFO AMOUT REFO AMOUT REFO
Pin 35 AUDEXT AUDEXT QSSO AMOUT AUDEXT QSSO AMOUT
Pin44 AUDOUT Controlled AM or audio out
Notes
1)When additional(external) selectivity is required for FM-PLL system pin 32 can be used as sound IF
input. This function is selected by means of SIF bit in subaddress 28H.
2)The reference output signal is only available for the CMB1/CMBO setting of 0/1. For the other setings
this pin is a switch output.
23
SERVICE MANUAL
Fig.8 Pin Configuration (SDIP 64)
24
SERVICE MANUAL
1.2 Electronic switch circuit HEF4053
Triple 2-channel Analog
Multiplexer/Demultiplexer
1). Description (low impedance ON-state) by Sn. With E
The HEF4053 is a triple 2-channel analog HIGH, all switches are in the high impedance
multiplexer/demultiplexer with a common enable OFF-state, independent of SA to SC.
input ( E ). Each multiplexer/demultiplexer has two VDD and VSS are the supply voltage connections
indepen- for the digital control inputs (SA to SC and E ).
dent inputs/outputs (Y0 and Y1), a common The VDD to VSS range is 3 to 15V.The analog
input/output (Z), and select inputs (Sn). Each also inputs/outputs (Y0, Y1 and Z) can swing
contains two-bidirectional analog switches, each between VDD as a positive limit and VEE as a
with one side connected to an independent negative limit. VDD-VEE may not exceed 15 V.
input/output (Y0 and Y1) and the other side For operation as a digital
connected to a common input/output (Z). multiplexer/demultiplexer, VEE is connected to
With ( E ) LOW, one of the two switches is selected VSS (typically ground).
2). Block Diagrams
Fig.9 Functional Diagram
25
SERVICE MANUAL
Pinning
Y0A to Y0C Independent inputs/outputs
Y1A to Y1C Independent inputs/outputs
SA to Sc Select inputs
E Enable input (active LOW)
ZA to ZC Common inputs/outputs
3. Function Table
Fig. 10 Pinning Diagram Inputs Channel
E Sn On
HEF4053P(N): 16-lead DIL; plastic L L Y0n-Zn
(SOT38-1) L H Y1n-Zn
HEF4053D(F): 16-lead DIL; ceramic H X none
(cerdip)
(SOT74) Notes
HEF4053T(D): 16-lead S0; plastic H=HIGH state (the more positive voltage)
(SOT109-1) L=LOW state (the less positive voltage)
(): Package Designator North America X=STATE is immaterial
Fig. 21 Schematic Diagram (One Switch)
Fig 11
Ratings
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Supply voltage (with reference to VDD) VEE -18 to + 0,5 V
Note
To avoid drawing VDD current out of terminal Z, when switch current flows into terminals Y, the voltage
drop across the bidirecctional switch must not exceed 0, 4 V. If the switch current flows into terminal
Z, no VDD current will flow out of terminals Y, in this case there is no limit for the voltage drop across
the switch, but the voltages at Y and Z may not exceed VDD or VEE.
26
SERVICE MANUAL
1.3 Sound power amplifier TDA7057AQ
2×8W Stereo BTL Audio Output Amplifier with DC Volume Control
1). Features 2). General Description
¡¤ DC volume control The TDA7057AQ is a stereo BTL output amplifier
¡¤ Few external components with DC volume control. The device is designed for
¡¤ Mute mode use in TVs and monitiors, but is also suitable for
¡¤ Thermal protection battery-fed portable recorders and radios.
¡¤ Short-circuit proof
¡¤ No switch-on and switch-off clicks Missing Current Limiter (MCL)
¡¤ Good overall stability A MCL protection circuit is built-in. The MCL circuit is
¡¤ Low power consumption activated when the difference in current between the
¡¤ Low HF radiation output terminal of each amplifier exceeds 100 mA
¡¤ ESD protected on all pins. (typical 300 Ma). This level of 100 mA allows for
single-ended headphone applications.
3). Block Diagram
Fig.12
27
SERVICE MANUAL
1.4 Vertical scan output stage circuit TDA8356/N6
DC-coupled vertical deflection circuit TDA8356
1) Features
¡ñ Few external components
¡ñ Highly efficient fully DC-coupled vertical output bridge circuit
¡ñ Vertical flyback switch
¡ñ Guard circuit
¡ñ Protection against:
Short-circuit of the output pins (7 and 4)