Vizio P50HDTV10A Service Manual page 31

PDP DISPLAY NOTHING(Composite 1 without screen)
BLOCK 1
Is picture on screen?
PDP DISPLAY NOTHING(Composite 1 on PIP without screen)
BLOCK 1
Is picture on screen?
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No No
Check C310,R275,R274 Check Q28's emitter.
Is there signal? Is there signal?
Yes
No
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
Check:
No
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
No No
Check C308,R273,R274 Check Q28's emitter.
Is there signal? Is there signal?
Yes
No
Use GProbe connect
from main to PC. Q10 fail
Does scaler detect the signal?
Yes
Check:
No
1.C309 (signal AC coupled)
2.R276
3.R279(75ohm impedance)
Is there signal?
Check Q28's Base.
No No
Is there signal?
Check collector
voltage(+5V).
Q13 fail
Check input source
Check Q28's Base.
No No
Is there signal?
Check collector
voltage(+5V).
Check input source
Q28 fail
Q28 fail
7
Page 9-12
File No. SG-0219