Main Pcb Trouble Diagnosis; Video & Jack Pcb Trouble Diagnosis - Daewoo DP-42GM Service Manual

9-1. VIDEO & JACK PCB Trouble Diagnosis
1. Common checking process when No signal or No raster
Check start
Does No signal
screen appear?
Is the signal input Jack
correctly connected?
Does input suorce (AV
device) operate?
Is input selection in used
mode ?
2. When No VIDEO ( COMPOSITE , S-VHS , Y Cb Cr ) signal on screen
(1)Input PC or DTV signal and see if PC or DTV signals shown on screen
If no signal then check TP DCLKB. DHS. DVS signal
if DCLKB. DHS. DVS signal do not appear, VIDEO PCB has a
trouble.
(2) When Y Cb Cr input : Check 16th pin of P502
Check the connection of
Jack(PDP or AV device)
Is DVS,DHS,DCLK of
Video PCB normal?
Confirm input
1. Check other PCBs (DIGITAL,
selection
X/Y-SUS, CONNECTION
2. Reassemble or change PA603
-49-
1. confirm Ac connection
Is there a weak
2. confirm Power S/W ON
discharge on the
3. Check other PCBs
sereen?
Is P603 correctly
connected?
Is DVS,DHS,DCLK of
Video PCB normal?
Check PA603
Exchange Video
PCB