SONY STRW6553A Service Manual
COLOR TELEVISION
TQ2092
CONTENTS
Safety precautions………………………………………………………………………..…
Alignment instructions …………………………….…….………………………..…….…
Working principle analysis of the unit……………………………….………….………….
Block diagram…………………………………..……………………….………….………
IC block diagram………………………………………………………………………..……
Wiring diagram ……………………………………………………………..……………...
Troubleshooting………………………………………………………………………..……
Schematic diagram …………………………………………………………………….…..
APPENDIX-A: Main assembly list
APPENDIX-B: Exploded view
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14
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Note: This service manual is only for professional service personnel’s reference. Before
servicing the unit, please read the following items carefully.
Safety instruction
1. X-RAY radiation precaution
1.1 Excessive voltage will cause harmful X-ray. To avoid this radiation hazard, the high voltage should
fall within the limitation. The appliance works at AC 110V, 60Hz. The high voltage of zero beam current
(brightness is min) should be within 29kV on condition that the main power voltage is AC110V. And it
should not exceed 33kV in any condition.
When servicing, please refer to the HIGH VOLTAGE CHECK procedure this service manual before
check the high voltage and the high voltage meter should be reliable and accurate.
* Keep the main power voltage at 110V when checking the high voltage.
1.2 The primary source of X-RAY RADIATION is the CRT. The CRT of this TV set have gotten the
approval of safety authentication inspection. The replacement CRT should be exactly the same type and
specification CRT which has gotten a similar safety approval, and check the high voltage according to
the HIGH VOLTAGE CHECK procedure.
2. Safety precaution
a. Since the power supply circuit of this receiver is directly connected to the AC power line, an isolation
transformer is necessary during dynamic service to avoid possible shock hazard.
b. Always discharge the graphite layer conductor when moving the CRT.
c. Disconnect the power cord before replacing parts.
d. When replacing high-power resistor, keep the resistor 10 mm away from the circuit board.
3. Component safety precaution
Many electrical and mechanical parts in the chassis have special safety-related characteristics. These
characteristics are often passed unnoticed by a visual inspection. Replacement parts which have these
special safety characteristics are identified in this manual and its supplement electrical components
having such features are shaded or marked by on the schematic diagram and the parts list. Before
replacing any of these components, read the parts list in this manual carefully. The use of substitute
replacement parts which do not have the same characteristic as specified in the parts list may create
shock, fire, X-RAY RADIATION or other hazards.
General instruction
1. Copy the standard model data to let EEPROM (N101 M24C16)of the chassis have those data
before placing it on the unit, do “factory adjustment” if necessary. If use a blank EEPROM directly, you
should preset IIC data and then do other common adjustment.
2.The adjustment should be done under following circumstances without additional instruction
a) Alternating current 110V/60Hz
b) Preheat at least 30 min
3.The unit has auto degaussing circuit, the auto degaussing process can be finished within 1s when
the main power. Only when turn on the unit at least 30min after last time turn off TV does the auto
degaussing circuit work.
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4. If the CRT with magnetism affects color purity and convergence, when the auto degaussing eraser.
if the color purity and convergence are still not very good, then corresponding adjustment should be
done. Refer to picture tube adjustment method for adjustment.
Alignment instruction
1. Debugging item
a) VIF adjustment
b) S-TRAP adjustment
c) H VCO adjustment
d) OSD adjustment
e) B+ voltage adjustment
f) RF AGC voltage adjustment
g) Focus adjustment
h) Screen-grid voltage white balance adjustment
i) Field, line scan center adjustment
j) Filed, line amplitude adjustment
k) Raster adjustment
2. Alignment flow
2
E2PROM copy
VIF adjustment
S-TRAP adjustment
H VCO adjustment
OSD adjustment
B+ adjustment
RF AGC adjustment
Focus adjustment
Screen-grid voltage white
balance adjustment
Scan amplitude, center and
raster adjustment
Check
Fig-1 alignment flow
High voltage check
X-ray protect check
Filament voltage check
Picture and sound check
Sub brightness check
White balance check
Color Purity, convergence check
AV, S terminal check
The unit and remote control
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3. Factory menu adjustment (FACTORY MENU PAGE)
3.1 VIF adjustment
Receive a signal at will, enter factory menu VCJ ADJ, select VIF VCO, press “VOL+/_”, then display
“END” and it means IC has adjust IF to 45.75MHz automatically.
3.2 S-TRAP adjustment
Receive a signal at will, enter factory menu VCJ ADJ, select S-TRAP, press “ VOL+/_”, then IC will adjust
S-TRAP to the best situation.
3.3 H VCO adjustment
Receive a signal at will, enter factory menu RASTER ADJ, select H VCO ADJ, press “ VOL+/_”, then IC
will auto adjust H VCO to the best situation.
3.4 OSD adjustment
Receive NTSC signal, check the OSD, if OSD is not at the center of the screen, you can adjust ”110:
OSD H-POS” of the last page of SERVICE MENU.
3.5 B+ voltage adjustment
a) Make sure that the power is AC 110V/60Hz
b) Connect B+ point with a digital voltmeter, receive A-7 signal, set the picture to “standard”, the
value of B+ voltage should be 110 V ±0.5 V
3.6 AGC adjustment
a) Receive 60 dB split field signal(A-7).
b) Use oscilloscope or digital voltmeter to monitor check TUNER 1# pin’s voltage (AGC output).
c) Enter factory menu VCJ ADJ, select RE DELAY, increase the value until the voltage just about
3.8V, now the picture should just without noisy, otherwise adjust R-AGC slightly.
3.7 Focus adjustment
a) Receive A-12 PHILIPS signal, set user control to “standard”.
b) Adjust focus electrode potentiometer on FBT to optimize B area focus of screen.
3.8 Screen-grid voltage and white balance adjustment
a) Receive A-7 signal, set user control to “vivid”.
b) Select CRT ADJ of factory menu, fixed C-OFF G(175), adjust C-OFF R, C-OFF B, DRV-R,
DRV-B, till the white balance is normal basically.
c) Adjust potentiometer of SCREEN till the bottom right two scales appear, now the SCREEN
voltage is about 530V±10V. If SCREEN voltage is normal, while the picture not, you can adjust
SUB BRIGHT and SUB CONTRAST of PICTURE ADJ.
d) fine adjust white balance (color temperature:12000K±8MPCD,X=0.270±0.008, Y=0.283±0.008)
e) At YUV state adjust C-OFF R YCbCr, C-OFF B YCbCr, DRV-R YCbCr, DRV-B YcbCr, till the
white balance is normal.
3.9 line, field center adjustment
NTSC(60Hz) line, field center adjustment
Receive A6 signal, set user control to “standard”, enter RASTER ADJ item, adjust field center V-POS,
line center H-POS, let the center of picture coincide with center of screen.
3.10 field amplitude adjustment
NTSC(60Hz) field amplitude adjustment
Receive A12 signal, set user control to “standard”, adjust field amplitude V-SIZE, let the vertical
reproduction ratio of picture acceptable 8%.
3.11 if the linearity and geometry are not satisfied, you may adjust the following items of RASTER ADJ:
Corner PARA
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Trape VS-CORE V-LIN
4. Checking point
4.1 High voltage check
Connect High Voltage meter between CRT second anode and GND.
1) Receive A7 signal, set user control to “STANDARD”, measure the high voltage value, the reading
should be 25.5 kV±1 kV
Set the brightness and contrast to minimum (zero beam current), measure the high voltage, the reading
should not exceed 32kV.
4.2 CRT filament voltage check
Receive A7 signal, set picture to “STANDARD”, use effective voltage meter to measure CRT filament
voltage, the reading should be (6.3±0.3) Vrms
4.3 X-ray protection check
1) Receive A7 signal, set user control to “vivid”.
2) Short circuit R309 (TP302, TP303), X-Ray protection circuit should function.
4.4 Picture and sound check
1) Receive standard TV signal.
2) Use picture control buttons to check color, contrast, brightness, sharpness, tint’s function.
3) Use sound control buttons to check volume control function.
4.5 Sub-brightness check
Receive A7 signal, set user control to “vivid”, picture bottom right side 2 lattices slightly light up.
4.6 Color purity and convergence check (in normal way)
4.7 AV terminals IN/OUT check
4.8 Y, Cb, Cr video and sound IN check .
4.8 Other buttons on the TV set and remote controller function check.
5 Ex-factory setting
5.1 picture menu
CONTRAST 45
BRIGHT 35
COLOR 30
TITN 0
SHARPNESS 30
PICTURE MODE STANDARD
5.2 Volulme: 30
5.3 Language: English
5.4 TV mode: channel 1
6 Factory menu
6.1 enter factory menu method
1) Press factory button to enter factory menu.
2) Press CH+ or CH- to select sub-menu and VOL+ or VOL- to enter.
3) Press MENU to exit.
6.2 the content of factory menu see table 1
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