Vizio P50HDTV10A Service Manual page 32

PDP DISPLAY NOTHING(Composite 2 without screen)
BLOCK 1
Is picture on screen?
PDP DISPLAY NOTHING(Composite 2 on PIP without screen)
BLOCK 1
Is picture on screen?
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No No
Check C316,R286,R285 Check Q29's emitter.
Is there signal? Is there signal?
Yes
No
Use GProbe connect
from main to PC. Q13 fail
Does scaler detect the signal?
Yes
Check:
No
1.C315 (signal AC coupled)
2.R282
3.R283(75ohm impedance)
Is there signal?
No No
Check C316,R284,R285 Check Q29'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.C315 (signal AC coupled)
2.R282
3.R283(75ohm impedance)
Is there signal?
Check Q29's Base.
No No
Is there signal?
Check collector
voltage(+5V).
Check input source
Check Q29's Base.
No No
Is there signal?
Check collector
voltage(+5V).
Check input source
Q29 fail
Q29 fail
8
Page 9-13
File No. SG-0219