Service manual

CONFIDENTIAL – DO NOT COPY
Page10-12
File No. SG-0174
8
Check C316,R286,R285
Is there signal?
No
Is picture on screen?
No
PDP DISPLAY NOTHING(Composite 2 without screen)
BLOCK 1
Check Q29’s emitter.
Is there signal?
No
Check Q29’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q29 fail
Check:
1.C315 (signal AC coupled)
2.R282
3.R283(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
PDP DISPLAY NOTHING(Composite 2 on PIP without screen)
Check C316,R284,R285
Is there signal?
No
Is picture on screen?
No
BLOCK 1
Check Q29’s emitter.
Is there signal?
No
Check Q29’s Base.
Is there signal?
Check collector
voltage(+5V).
No
Q29 fail
Check:
1.C315 (signal AC coupled)
2.R282
3.R283(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