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MODEL LC-15B2EA
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LC-15B2EA
SERVICE MANUAL
S42H2LC15B2EA
LCD COLOUR TELEVISION
MODEL LC-15B2EA
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
CONTENTS
Page Page
» IMPORTANT SERVICE SAFETY Ë MAIN UNIT ................................................ 26
PRECAUTION.................................................... 2 Ë TUNER UNIT ............................................. 38
» SPECIFICATIONS ............................................. 3 Ë INVERTER UNIT ....................................... 46
» OPERATION MANUAL ...................................... 4 » PRINTED WIRING BOARD ASSEMBLIES ..... 47
» DIMENSIONS .................................................... 5 » PARTS LIST
» REMOVING OF MAJOR PARTS ....................... 6 Ë ELECTRICAL PARTS ................................ 51
» ADJUSTING PROCEDURE OF Ë MAIN UNIT ................................................ 51
EACH SECTION ................................................ 9 Ë TUNER UNIT ............................................. 55
» TROUBLE SHOOTING TABLE ........................ 12 Ë INVERTER UNIT ....................................... 59
» CHASSIS LAYOUT .......................................... 18 Ë RC/LED UNIT ............................................ 60
» BLOCK DIAGRAM ........................................... 20 Ë OPERATION UNIT ..................................... 60
» OVERALL WIRING DIAGRAM ........................ 22 Ë CABINET AND MECHANICAL PARTS ..... 60
» DESCRIPTION OF SCHEMATIC DIAGRAM .. 24 Ë ACCESSORIES PARTS ............................ 62
» SCHEMATIC DIAGRAM Ë PACKING PARTS ....................................... 62
Ë RC/LED and OPERATION UNIT ............... 25 » PACKING OF THE SET ................................... 63
SHARP CORPORATION
LC-15B2EA
IMPORTANT SERVICE SAFETY PRECAUTION
Ë Service work should be perfomed only by qualified service technicians who are thoroughly
familiar with all safety checks and the servicing guidelines which follow:
WARNING · Use an AC voltmeter having with 5000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
1. For continued safety, no modification of any circuit across the resisor.
should be attempted. · Connect the resistor connection to all exposed metal
2. Disconnect AC power before servicing. parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
CAUTION: FOR CONTINUED PROTECTION escutcheon, etc.) and measure the AC voltage drop
AGAINST A RISK OF FIRE REPLACE ONLY WITH across the resistor.
SAME TYPE F1(T1.25AL, 250V), F2(T1.25AL, 250V), All checks must be repeated with the AC cord plug
F6500 (T1.25AL, 250V) AND F6501 (T1.25AL, 250V) connection reversed. (If necessary, a nonpolarized
FUSE. adaptor plug must be used only for the purpose of
completing these checks.)
BEFORE RETURNING THE RECEIVER Any reading of 0.75V peak (this corresponds to 0.5
(Fire & Shock Hazard) milliamp. peak AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
Before returning the receiver to the user, perform before returning the monitor to the owner.
the following safety checks:
1. Inspect all lead dress to make certain that leads are
not pinched, and check that hardware is not lodged
between the chassis and other metal parts in the
receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulation materials, cabinet backs, DVM
adjustment and compartment covers or shields, AC SCALE
isolation resistor-capacitor networks, mechanical
50k ohm
insulators, etc. 10W
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
· Plug the AC cord directly into a 110~240 volt AC outlet,
and connect the DC power cable into the receiver's
0.15 µF
DC jack. (Do not use an isolation transformer for this TEST PROBE
test).
· Using two clip leads, connect a 50k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all
exposed metal cabinet parts and a known earth ground, TO EXPOSED
such as electrical conduit or electrical ground connected CONNECT TO
METAL PARTS
KNOWN EARTH
to an earth ground. GROUND
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SAFETY NOTICE
Many electrical and mechanical parts in LCD television and shaded areas in the Replacement Parts Lists and
have special safety-related characteristics. Schematic Diagrams.
These characteristics are often not evident from visual For continued protection, replacement parts must be
inspection, nor can protection afforded by them be identical to those used in the original circuit.
necessarily increased by using replacement components The use of a substitute replacement parts which do not
rated for higher voltage, wattage, etc. have the same safety characteristics as the factory
Replacement parts which have these special safety recommended replacement parts shown in this service
characteristics are identified in this manual; electrical manual, may create shock, fire or other hazards.
components having such features are identified by " å"
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21210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
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2
LC-15B2EA
Specifications
Items 15" LCD COLOUR TV, Model: LC-15B2EA
LCD panel 15" Advanced Super View & BLACK TFT LCD
Number of dots 921,600 dots
Video colour system PAL/SECAM/NTSC
TV TV-Standard (CCIR) B/G, I, D/K, L
Function TV-Tuning System Auto preset 200 ch.
STEREO/BILINGUAL NICAM, IGR
AUTO PRESET Yes
CATV ~Hyper Band
Brightness 430 cd/m2
Lamp life 60,000 hours
Viewing angles H: 170° V: 170°
Audio amplifier 2.1 W × 2
Speakers 4 × 7 cm Oval, 2 pcs.
Terminals AV-IN 1 RGB
AV-IN 2 S-VIDEO, VIDEO, AUDIO
OUT AUDIO
Antenna DIN
Headphones 3.5 mm ø jack (Rear)
OSD language English/German/French/Spanish/Italian/Swedish/Dutch
Power requirement DC 12 V, AC 110 V 240 V, 50/60 Hz
Weight 5.2 kg, incl. stand, excl. accessories
Accessories Operation Manual, Remote Control, Batteries,
AC adapter, AC cord, Cable clamp
Specifications are subject to change without prior notice.
3
LC-15B2EA
Operation Manual
Main unit (front view) Terminals
Upper control panel
Volume (+)/()
CH ( )/( )
MENU Antenna
TV/VIDEO
(MAIN POWER)
CH MENU TV/VIDEO
OUT AUDIO OUT (L)
AUDIO
L
AUDIO OUT (R)
R
Speaker Speaker Headphones
To change the vertical
angle of the LCD TV set,
tilt the screen up to 5
degrees forward or 10
degrees backward. The
Rear view
TV set can also be
rotated 50 degrees
horizontally. Please adjust Carrying handle
the angle so that the TV
set can be watched most RGB
AV-IN 1
comfortably.
AV-IN 2
S-VIDEO
VIDEO
L
AUDIO
R
AUDIO OUT
POWER
L INPUT
DC12V
R
Remote sensor indicator
A red indicator blinks when the TV set
receives the remote control signal.
Remote sensor window POWER/STANDBY indicator
(The actual location is not visible.) A green indicator lights when the power is
on and a red indicator lights when in the
standby mode (the indicator will not light
when the main power is off).
AV-IN 1 AV-IN 1
Note: RGB
Ë TV/VIDEO, CH( )/( ), and Volume (+)/() on the main unit have the same functions as the same
(21-pin Euro-SCART)
buttons on the remote control. Fundamentally, this operation manual provides a description based on
operation using the remote control.
AV-IN 2
S-VIDEO S-VIDEO
VIDEO VIDEO
AV-IN 2
AUDIO (L) L
Remote control AUDIO (R)
AUDIO
R
POWE
POWER R
INPUT
DC12
V
INPUT
TEXT DC12V
REVEAL
The last Teletext page is
HOLD displayed with the Reveal
Temporarily holds function activated.
the current Teletext page. The Reveal function applies
to this page only once.
(Power)
END
TEXT REVEAL
HOLD
OK, Programme Table T Upwards /Downwards
E END Selection, zoom display
SUBTITL
function
SUBTITLE E (Teletext mode)
Displays the Teletext
Subtitle directly. OK MENU
SOUND MENU
SOUND
Switches the M Right / Left Selection
sound mode.
Cyan, Status Display
Red, Picture Menu Turns on the status display
Green, Sound Menu when the menu is not
displayed.
Volume (+)/() CH
Yellow,
Timer function Menu
Mute
CH ( )/( )
Display previous/
next page
(Teletext mode)
Channel Select
TV/VIDEO
Flashback TV/VIDEO
Returns to the
previous channel.
4
LC-15B2EA
Dimensions
61.1
56.5
CH MENU TV/VIDEO
484
149.5
305.3
303
381.7
229
78.7
1
301.6
98.8
61.1
100
11.8
AV-IN 1
RGB
100
AV-IN 2
S-VIDEO
366.2
VIDEO
AUDIO OUT
L
L
AUDIO
R
R
POWER
INPUT
DC12V
27
1
149.5 48.5
198 (Unit: mm)
5
LC-15B2EA
REMOVING OF MAJOR PARTS
1. Remove the back cover.
2. Remove the table stand fixing screws (4 pcs.).
3. Remove the Rear cabinet fixing screws (9 pcs.) and detach the cabinet.
4. Peel off the tape.
5. Detach the connector from each PWB. 3
3 4-3
4-6 4-5 4-4
Front cabinet 4-2
3
4-7 RGB
AV-IN 1
Terminal
AV-IN 2
S-VIDEO
cover (L)
VIDEO
L
3
AUDIO
R
AUDIO OUT
L
R
POWER
INPUT
DC12V
4-1
3 1
4-8
Terminal
1
Rear cabinet cover (S)
2
Table stand
OPERATION PWB
5 5 5 5 5
P4004
SC1202 SC1201 P6500 P6501
P2003
INVERTER PWB
P6502
5
MAIN PWB 55
SC901
SC1203
SC2002 P3702
5 5 SC3100
SC1602 P1903
4
Tape
TUNER PWB
P3302 P3301
5
P3601 5 5 P3603
LED PWB
6
LC-15B2EA
6. Remove the MAIN PWB fixing screws (3 pcs.).
7. Remove the INVERTER PWB fixing screws (2 pcs.).
8. Remove the 21-pin terminal fixing screw (2 pcs.).
9. Detach the chassis frame cover.
10. Remove the TUNER PWB fixing screws (4 pcs.).
11. Remove the LED PWB fixing screws (2pcs.).
12. Remove the OPERATION PWB fixing
screws (2 pcs.).
13. Remove the chassis frame fixing screws
(2 pcs.).
14. Remove the LCD panel unit fixing screws
(2 pcs.).
7
LC-15B2EA
» Precautions in handling the LCD panels
1. Work in a clean room (with humidities below 50%).
2. Be sure to wear an anti-static armband.
3. Handle the panels on an electroconductive mat.
4. Be careful not to fall, shake and shock the panels.
15. Remove the LCD display unit fixing screws (4 pcs.).
16. Detach the two diffusion sheets and reflection/deflection sheet.
17. Detach the four reflection mirrors.
18. Remove the fluorescent lamp.
19. Detach the lamp guide plate.
20. Detach the two lamp reflection sheets.
17 Reflection Mirror
Sheilding Plate
Light Guide Plate (PSLDM4689CEFW)
(PGiDM0070CEZZ)
Backlight Lamp
(KLMP-0122CEZZ) 19
18
Reflection Sheet (Cover)
(PSHEP0306CEZZ)
17 Reflection Mirror
15
Lamp Reflection Sheet-1
20
(PSHEP0284CEZZ)
Lamp Reflection Sheet-2
(PSHEP0285CEZZ)
16
15' LCD Panel Unit Diffusion Sheet
(PSHEP0283CEZZ)
Reflection/deflection Sheet
(PSHEP0281CEZZ)
8
LC-15B2EA
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed,
adjust as follows.
Preparation for adjustments
Use the dedicated AC adaptor or stable DC power supply.
LC15B2EA AC adaptor: UADP-0240CEZZ
DC power supply: 12V 4.0A
1. Adjusting procedure
· Checker adjustment
Power ON (Adjustment processing mode) +B adjustment Counter bias adjustment TAMP (Contrast)
adjustment
White balance adjustment
2. Entering the adjustment processing mode
There are the following two methods.
· Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.
· A "POWER" key is made on with pushing an "TV/VIDEO" and "MENU" keys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane.) Next, "CH (Ù)" and "VOL ()" keys are pushed
at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made
to turn it off.(Even off in the "MAIN POWER" key, off with R/C are good.)
3. Key operation in the adjustment process mode
· The receiving channel UP/DOWN is performed with the "CH (ù)/(Ù)" keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
· Various adjustments
The adjustment is performed for each item by the "MENU", "Menu cursor", "CH (ù)/(Ù)" or "VOL (+)/()" keys
(LCD TV set and remote control).
· Adjustment item is chosen with the Menu cursor upward/downward keys.
· The adjustment item makes a toggle operation with the "MENU" key input. (Next item)
If the "MENU" key is input while the bottom item is selected, it moves to the top item on the next page.
· Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1 Page 2 ... Page 23 Page 1
· Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.
· UP/DOWN of each adjustment vale selected is performed with the VOL (+)/() keys input.
· For P16 17, the unit enters the register select mode with the VOL (+)/() keys input while NTSC/PAL is selected,
and the cursor moves to the address 01.
· The cursor moves up or down with the "CH (ù)/(Ù)" keys and moves left or right with the VOL (+)/() keys, and a
decision is made with the 12 key.
When the decision is made, the cursor moves to the adjustment value selected, and UP/DOWN of each adjustment
value selected by the "VOL (+)/()" keys input is performed.
0 1 ... 9 A ... F 0 ...
Decide with the 12 key and return to the address select. Move to the next item with the "MENU" key.
During address select, the cursor movement by the "VOL (+)/()" keys input is as follows:
Example: 01 02 03 01 ...
The cursor movement by the "CH (ù)/(Ù)" keys input is as follows:
Example: 02 05 ... F6 02 ...
9
LC-15B2EA
4. Initialization
When the microprocessor (IC2001) or the EEPROM (IC2004) has been replaced or when the EEPROM has been
initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (B2EA).
4-3. Select the inch size (15).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
becomes adjustment mode.
5. Adjustment
5-1. +B adjustment...Page 1 +B-ADJ
Adjust the voltage of the pin (13) of P2002 to 5.00 ±0.02V.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
5-2. Counter-bias adjustment
Vary the "COM BIAS" setting on Page 2 of the adjustment process mode so that the contrast be sharpest
(black looks most sinking).
5-3. TAMP adjustment
1) Receive the upper left of 75% white half colour bar signal.
2) See if the "Y" reading on page 2 of the adjusment process mode is somewhere following. If not, make the
"PAL TAMP" adjustment to get the "Y" reading in the range of BF thru C9.
3) If the adjustment of "PAL TAMP" is executed, write its adjustment value to the "SECAM TAMP" manually.
(Screen of the page 2 of the adjustment processing menu OSD)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
0 2
1 C O M B I A S 1 2 0
2 P A L T A M P 2 7
3 S E C A M T A M P 2 7
4 R C U T O F F 5
5 G C U T O F F 0
6 B C U T O F F 1
7 G 3 B 3 R 3 0 0 0 0 0 0
8 G 1 B 4 Y 0 0 0 0 B E
9 T A M P H C 9
10 T A M P L B F
11
12
13
Y Data
(White 75%)
5-4. White balance adjustment
Adjust "RCUTOFF" and "BCUTOFF" on the page 2 of the adjustment processing so as to obtain the colour
of the same level as the standard set.
Note: For the adjustment processing of "RCUTOFF" and "BCUTOFF", adjust them in the indication value
range of ... 9, 7, ... 1, +1, ... +7, +9.
When it becomes even-numbered value, side favor noise sometimes occurs in the monochrome signal of
the specific gradation.
10
LC-15B2EA
6. Factory Setting
6-1. Perform a factory setting after completing all adjustments.
6-2. A "POWER" keys is made on with pushing an "TV/VIDEO" and "MENU" keys at the same time.
6-3. "K" of the inspection process mode is displayed on the screen upper left.
6-4. CH (ù) and VOL (+) keys are pushed about 2 seconds at the same time.
6-5. Release keys, if "E" is displayed on the screen upper left and "COMPLETE" is displayed on the bottom of it.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: "First installation" serves on "Deutsch".
7. Lamp error detection
7-1. Functional description
This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side
of TV turns from green to red.)
2 If the situation 1 happens 5 times sequentially, television can not be turned ON. (The power LED remains
red.)
7-2. Countermeasures
7-2-1. Check when turning OFF the lamp error detection
When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 7, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
7-2-2. Resetting of the lamp error count
After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO
RESET" on line 5, page 1 of the adjustment process and set the number to 0 using the volume button.
Page 1 of the adjustment process
1
+B A D J 160
MODE L B2EA
I N C H S I Z E 15
NT S C PW M F R E Q 0C0
P A L PWM F R E Q 0BD
NT S C PWM D U T Y 0
P A L PWM D U T Y 0
T V GA I N OFF
E R R OR N O R E S E T 5 Reset 0
P U B L I C MO D E OFF
C 2 E A V E R 1 .2 0 0
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
11
No picture, No sound Back light lamp failure to light up
LC-15B2EA
Check all the settings microprocessor's adjust process menu.
No Remove F1 and F2 and No
Do F1 and F2 function? check the load side. Replace F1 and F2. Replace F6500 and F6501.
Is there short-circuiting?
Yes Yes Yes
Are T3701's secondary Is there short-circuiting of No No
Check S4701 and Is the pin (34) of IC1201 in Check the OFL1 line, IC1201
outputs +31V, +22V, +9V, T3701 primary side periphery,
connection cable. the "H" state? and their peripheral parts.
+5V and -8V normal? Q3700, Q3701 and S4701?
No Yes Yes
Is the primary side of No Check T6500~T6503,
Is T3701's primary oscillator Check J3702 periphery and
T6500~T6503 periphery Q6500~Q6505 and
waveform normal? connection cable.
short-circuiting? connection cable.
Yes Yes
Check T3701's secondary Replace the back light lamp
load. with new one and check
again.
12
TROUBLE SHOOTING TABLE
No picture (1)
No TV and
No picture No VIDEO 2
S-Video No TV output
at all output
output
Check all the settings microprocessor's adjust process menu.
No Check IC801 No Check IC402 Is voltages at No Is input at pin No Check V1 IN
Is in/output of Is in/output of Check the
and its and its pins (6), (7) and (75) of IC801 line and its
IC801 normal? IC402 normal? power line.
peripheral parts. peripheral parts. (18) tuner normal? peripheral parts.
Yes Yes normal?
No Check IC1201 Is input at pin No Check IC801, Yes
Is in/output of
and its (73) of IC801 AV1 line and its
IC1201 normal? Is output at pin No Check tuner
peripheral parts. normal? peripheral parts.
(13) of tuner and its
Yes normal? peripheral parts.
Check LCD Yes
panel voltages No
Is input at pin
and waveform. Check the its
(3) of IC402
13
normal? line.
Yes
Is the pins (2) No Check IC402
and (4) of IC402 and its
at "H" and "L" peripheral parts.
state?
Yes
Is the pins (65) No
and (66) of Check the its
IC2001 at "H" line.
and "L" state?
TROUBLE SHOOTING TABLE (Continued)
LC-15B2EA
No picture (2)
LC-15B2EA
No VIDEO 1 No S-VIDEO No TELETEXT
output output output
Check all the settings microprocessor's adjust process menu.
Is input at pin No Check the AV2 Is input at pin (1) Check the W9,
No Is input at pins (2), Yes
(74) of IC801 line and its of IC402 and pin SY-line, SC-line Check IC1203
(5), (11), and (14)
normal? peripheral parts. (71) of IC801 and their and its
of IC1203 normal?
normal? peripheral parts. peripheral parts.
No
Is input at pins (3), Yes
(4) and (5) of Check connection
SC1602 normal? cable
No
Is output at pins (1)
No Check IC1619,
and (7) of IC1619 and
14
pin (1) of IC1620 IC1620 and their
normal? peripheral parts.
Yes
Is output at pins Yes
(57)~(59) of IC1601 Check the R, G
normal? and B line.
No
No Check V2V0 line
Is input at pin (21) of
and its peripheral
IC1601 normal?
parts.
Yes
Check IC1601 and its
peripheral parts.
TROUBLE SHOOTING TABLE (Continued)
No picture (3)
No picture
Colour is Gradation
image
unusual inversion defect
Check all the settings microprocessor's adjust process menu.
Is output of No Is in/output of No Is output V0, V7, V17, No Check IC1106,
Check R1202 and Check R1209 and
R0~R7 SPIO and V21, V32, V64, V112, IC1107, IC1108,
its peripheral parts. its peripheral parts.
normal? SPOI normal? V176, V235 and IC1114, IC1115 and
V255 normal? their peripheral parts.
Yes Yes
Is output of No No Check IC1206,
Check R1203 and Is output of U/D
G0~G7 IC1207, Q1201 and
its peripheral parts. normal?
normal? their peripheral
Yes
15
Is output of No
Check R1204 and
B0~B7 its peripheral parts.
normal?
TROUBLE SHOOTING TABLE (Continued)
LC-15B2EA
No sound (1)
LC-15B2EA
No sound No sound No sound TV sound
from front from from output failure
speakers headphone line
Check all the settins microprocessor's adjust process menu.
Is the pin (53) of No Muting effect is Is the pin (52) of No Muting effect is Is output at pins No Check IC1901 Is output at pin No Check the tuner
IC2001 in the on. Check the IC2001 in the on. Check the (33) and (34) of and its (11) of TU1 and its
"L" state? FSMUTE line. "L" state? HP_MUTE line. IC1901 normal? peripheral parts. (Tuner) normal? peripheral parts.
Yes Yes Yes Yes
Is output at pins No Check IC1901 Is output at pins No Check IC1901 Is output at pins No Check IC3500 Is input at pins No Check IC1901
(27) and (28) of and its (24) and (25) of and its (1) and (7) of and its (67) and (69) and its
IC1901 normal? peripheral parts. IC1901 normal? peripheral parts. IC3500 normal? peripheral parts. of IC1901. peripheral
parts.
Yes Yes
Is output at pins No Check IC1903 Is output at pins No Check IC304
(1) and (7) of and its (1) and (7) of and its
IC1903 normal? peripheral parts. IC304 normal? peripheral parts.
16
Yes Yes
Is output at pins No Check IC3305 Check J5003
(8) and (12) of and its (Headphone Jack)
IC3305 normal? peripheral parts. and connection
cable.
Yes
Check front
speaker and
connection
cable.
TROUBLE SHOOTING TABLE (Continued)