Vizio P50HDTV10A Service Manual page 35

PDP DISPLAY NOTHING(S-VIDEO 2 without screen)
BLOCK 1
Is picture on screen?
Is picture color ok?
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No No
Check C332,R316,R320 Check Q33'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.C335 (signal AC coupled)
2.R300
3.R302(75ohm impedance)
Is there signal?
No No
Check C336,R319,R318 Check Q32'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.C333 (signal AC coupled)
2.R301
3.R303(75ohm impedance)
Is there signal?
Check Q33's Base.
No No
Is there signal?
Check collector
voltage(+5V).
U13 fail
Check input source
Check Q32's Base.
No No
Is there signal?
Check collector
voltage(+5V).
U13 fail
Check input source
Q33 fail
Q32 fail
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Page 9-16
File No. SG-0219