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UOC TDA93XX SERIES
SERVICE MANUAL
SERVICE MANUAL
COLOUR TELEVISION
OTM595(CU-2590)
OTM685(CU-2990)
OTM805(CU-3490)
.
CONTENTS
1. safety precautions...................................................................................................3
2. block diagram
and PHILIPS UOC functional difference between the various IC versions ......................4
3 Replacement of memory IC.......................................................................................7
4 Service adjustment...................................................................................................7
5 ICs functional description..........................................................................................11
6 Test point waveform.................................................................................................15
7 All ICs/transistors voltages........................................................................................16
8 Purity / convergence adjustment................................................................................17
9. Circuit diagram.........................................................................................................19
10. Material list...............................................................................................................21
11. Specifications................................................................................................... .......55
2
.
SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many 9. manufacturer's replacement components.
circuits and components specially for safety purposes. For 10. Isolation Check
continued protection, no changes should be made to the (Safety for Electrical Shock Hazard)
original design unless authorized in writing by the After re-assembling the product, always perform an isolation
manufacturer. Replacement parts must be identical to those check on the exposed metal parts of the cabinet (antenna
used in the original circuits. Service should be performed by terminals, video/audio input and output terminals, Control
qualified personnel only. knobs, metal cabinet, screwheads, earphone jack, control
shafts, etc.) to be sure the product is safe to operate without
2. Alterations of the design or circuitry of the products should danger of electrical shock.
not be made. Any design alterations or additions will void 11. The surface of the TV screen is coated with a thin film which
the manufacturer's warranty and will further relieve the can easily be damaged. Be very careful with it when handle
manufacturer of responsibility for personal injury or property the TV. Should the TV screen become soiled, wipe it with a
damage resulting therefrom. soft dry cloth. Never rub it forcefully. Never use any cleaner
or detergent on it.
3. Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics (1) Dielectric Strength Test
are often not evident from visual inspection nor can the The isolation between the AC primary circuit and all metal
protection afforded by them necessarily be obtained by parts exposed to the user, particularly any exposed metal
using replacement components rated for higher voltage, part having a return path to the chassis should withstand a
wattage, etc. Replacement parts which have these special voltage of 3000V AC (r.m.s.) for a period of one second.
safety characteristics are identified in the parts list of (...Withstand a voltage of 1100V AC (r.m.s.) to an appliance
Service manual. Electrical components having such rated up to 120V, and 3000V AC (r.m.s.) to an appliance
features are identified by shading on the schematics rated 200V or more, for a periode of one second.)
and by ( ) on the parts list in Service manual. The use This method of test requires a test equipment not generally
of a substitute replacement which does not have the same found in the service trade.
safety characteristics as the recommended replacement (2) Leakage Current Check
part shown in the parts list of Service manual may cause Plug the AC line cord directly into the AC outlet (do not use
shock, fire, or other hazards a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
4. Don't short between the LIVE side ground and from each exposed metal part of the cabinet, particularly
ISOLATED (NEUTRAL) side ground or EARTH side any exposed metal part having a return path to the chassis,
ground when repairing. Some model's power circuit is to a known good earth ground (water pipe, etc.). Any
partly different in the GND. The difference of the GND is leakage current must not exceed 0.5mA AC (r.m.s.).
shown by the LIVE: ( ) side GND, ISOLATED (NEUTRAL) : However, in tropical area, this must not exceed 0.2mA AC
( ) side GND and EARTH : ( ) side GND. Don't short (r.m.s.).
between the LIVE side GND and ISOLATED (NEUTRAL) Alternate Check Method
side GND or EARTH side GND and never measure with a Plug the AC line cord directly into the AC outlet ( do not use
measuring apparatus (oscilloscope etc.) the LIVE side GND a line isolation transformer during this check.). Use an AC
and ISOLATED (NEUTRAL) side GND or EARTH side GND voltmeter having 1000 ohms per volt or more sensitivity in
at the same time. If above note will not be kept, a fuse or the following manner. Connect a 1500 10W resistor
any parts will be broken. paralleled by a 0.15 F AC-type capacitor between an
5. If any repair has been made to the chassis, it is exposed metal part and a known good earth ground (water
recommended that the B1 setting should be checked or pipe, etc.). Measure the AC voltage across the resistor with
adjusted (See ADJUSTMENT OF B1 POWER SUPPLY). the AC voltmeter. Move the resistor connection to each
exposed metal part, particularly any exposed metal part
6. The high voltage applied to the picture tube must conform having a return path to the chassis, and measure the AC
with that specified in Service manual. Excessive high voltage across the resistor. Now, reverse the plug in the AC
voltage can cause an increase in X-Ray emission, arcing outlet and repeat each measurement. Any voltage
and possible component damage, therefore operation under measured must not exceed 0.75V AC (r.m.s.). This
excessive high voltage conditions should be kept to a corresponds to 0.5mA AC (r.m.s.).
minimum, or should be prevented. If severe arcing occurs, However, in tropical area, this must not exceed 0.3V AC
remove the AC power immediately and determine the cause (r.m.s.).
by visual inspection (incorrect installation, cracked or melted This corresponds to 0.2mA AC (r.m.s.)
high voltage harness, poor soldering, etc.). To maintain the
proper minimum level of soft X-Ray emission, components
in the high voltage circuitry including the picture tube must
be the exact replacements or alternatives approved by the
manufacturer of the complete product.
7. Do not check high voltage by drawing an arc. Use a high
voltage meter or a high voltage probe with a VTVM.
Discharge the picture tube before attempting meter
connection, by connecting a clip lead to the ground frame
and connecting the other end of the lead through a 10k
2W resitor to the anode button.
8. When service is required, observe the original lead dress.
Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
3
.
2 TV Block diagram
TDA93XX
video
Vo
TUNER SAW IF IN Y IN Y
V2i
RF AGC V IN Cr 4052 video
V1i
U IN Cb
CVBSINT video Y
video CHROMA S-VHS
S
TRAP IFVO OUT video C
CVBS/Y IN
ARo
24C04 audio
ALo
SDA ARi2
bus
SCL TDA9874 ARi1
AUDIO OUT IK
A OUTR
A OUTL
AV2 R
AV2 R
SDA/SCL
M OUTR
M OUTL
RGB OUT XS303
MAIN R
MAIN L
TDA9859
AV1 L
AV2 L
V OUT H OUT
7
4
5
1
2
6
7
8
ALi2
bus 5V
audio ALi1
audio
AN7522
Vi1
V IN H IN 200V OUT1-
130V CRT PCB audio OUT1+
+15V
24V TDA8351 H OUT
POWER -15V Vi2
16V SCREEN CRT
V OUT H OUT OUT2-
8V
UNIT OUT2+
5V FOCUS
3.3V
DY
4
.
PHILIPS UOC FUNCTIONAL DIFFERENCE BETWEEN THE VARIOUS IC VERSIONS
IC VERSION 9350 9351 9352 9353 9360 9361 9362 9363 9364 9365 9366 9367 9380 9381 9382 9383 9384 9385 9386 9387 9388 9389 9370 9373 9375 9377 9378
TV rang 90 90 90 110 90 90 110 110 110 110 90 90 90 90 90 110 110 110 110 90 110 110 90 110 110 90 110
Mono inter-carrier multi-standard
Sound demodulator (4.5-6.5MHz)
With switch able centre frequency
Audio switch
Automatic volume leveling
Automatic volume leveling or
Subcarrier output (for comb filter
applications)
QSS sound IF amplifier with
Separate input and AGC circuit
AM sound demodulator without
Extra reference circuit
PAL decoder
SECAM decoder
NTSC decoder
Horizontal geometry(E-W)
Horizontal and vertical zoom
ROM size 32- 32- 32- 32- 64- 64- 64- 64- 64- 64- 64- 64- 16- 16- 16- 16- 16- 16- 16- 16- 16- 16- 32- 32- 32- 32- 32-
64k 64k 64k 64k 128 128 128 128 128 128 128 128 64k 64k 64k 64k 64k 64k 64k 64k 64k 64k 55k 55k 55k 55k 55k
User RAM size 1k 1k 1k 1k 2k 2k 2k 2k 2k 2k 2k 2k 1k 1k 1k 1k 1k 1k 1k 1k 1k 1k 2.25 2.25 2.25 2.25 2.25
Teletext 1p 1p 1p 1p 10p 10p 10p 10p 10p 10p 10p 10p
Closed captioning
Block diagram TDA93xX PS/N2 series with mono intercarrier sound demodulator
5
.
6
3.REPLACEMENT OF MEMORY IC
1. MEMORY IC.
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and
deflection circuits.
When replacing memory IC, be sure to use IC written with the initial value of data.
2. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off
Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC
Be sure to use memory IC written with the initial data values.
(3) Power On
Plug the power cord into the AC outlet and switch the power On.
(4) Check and set SYSTEM default value:
1) Press "QV" key holding about 4 second and then press "MENU1" key on the Remote control unit.
Or Press "TEST" key on the Remote control unit for factory used.
2) The "TEST" will be displayed on the screen.
3) Press digital key, (Mkey) and corresponding on-screen display will be appeared.
Some time "PASSWORD" on-screen display will be appeared, you need to input 828.
4) Check the setting value of the SYSTEM default value of Table below. If the value is different,
select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.
5) Press "STANDBY" key again and return to the normal screen.
4.SERVICE ADJUSTMENT
B1 POWER SUPPLY
1. Receive normal colour bar signal.
2. Connect DC voltmeter to VD541- and isolated ground.
3. Adjust potentiometer in power unit to get the voltage as 110V