Vizio Gallevia GV46LHDTV10A, Service Manual

Page: 88 / 180

CONFIDENTIAL – DO NOT COPY Page10- 15
File No. SG-0199
10
PDP DISPLAY NOTHING(S-VIDEO 1 on PIP mode without screen)
Check C318,R291,R292
Is there signal?
No
Is picture on screen?
No
BLOCK 1
Check Q30’s emitter.
Is there signal?
No
Check Q30’s Base.
Is there signal?
Check collector
v5V).
No
Q30 fail
Check:
1.C319 (signal AC coupled)
2.R297
3.R299(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
Is picture color ok?
Check C326,R306,R307
Is there signal?
No No
Check Q31’s emitter.
Is there signal?
No
Check Q31’s Base.
Is there signal?
Check collector
v5V).
No
Q31 fail
Check:
1.C327 (signal AC coupled)
2.R296
3.R298(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
LCD