Vizio VP50HDTV10A Service Manual - Page 31

PDP DISPLAY NOTHINGComposite 1 on PIP without screen, PDP DISPLAY NOTHINGComposite 1 without screen - base

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PDP DISPLAY NOTHING(Composite 1 without screen) BLOCK 1 No Is picture on screen? Check C310,R275,R274 Is there signal? Yes No No Check Q28's emitter. Is there signal? Check Q28's Base. No Is there signal? Check collector voltage(+5V). Use GProbe connect No from main to PC. Does scaler detect the signal? Q13 fail Yes Q28 fail Check: 1.C309 (signal AC coupled) 2.R276 3.R279(75ohm impedance) Is there signal? No Check input source PDP DISPLAY NOTHING(Composite 1 on PIP without screen) BLOCK 1 No No No Check Q28's Base. No Is picture on screen? Check C308,R273,R274 Is there signal? Check Q28's emitter. Is there signal? Is there signal? Check collector voltage(+5V). Yes Use GProbe connect No from main to PC. Does scaler detect the signal? Q10 fail Yes Q28 fail Check: 1.C309 (signal AC coupled) No 2.R276 Check input source 3.R279(75ohm impedance) Is there signal? 7 CONFIDENTIAL - DO NOT COPY Page 9-12 File No. SG-0219

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CONFIDENTIAL – DO NOT COPY
Page 9-
12
File No. SG-0219
7
Check C308,R273,R274
Is there signal?
No
Is picture on screen?
No
PDP DISPLAY NOTHING(Composite 1 on PIP without screen)
BLOCK 1
Check Q28’s emitter.
Is there signal?
No
Check Q28’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q28 fail
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Yes
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Q10 fail
No
Check input source
No
Check C310,R275,R274
Is there signal?
No
Is picture on screen?
No
PDP DISPLAY NOTHING(Composite 1 without screen)
BLOCK 1
Check Q28’s emitter.
Is there signal?
No
Check Q28’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q28 fail
Check:
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Yes
Yes
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Q13 fail
No
Check input source
No