Daewoo DP-42GM, Service Manual

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Main PCB Trouble Diagnosis
COMPOSITE Input : TP Vin check
S- VHS input : Check 24th pin of P502(when COLOR BAR PATTERN)
If above signal do not appear, JACK PCB has a trouble.
(3)TP DECOE Check
If DECOE signal do not appear, JACK PCB has a trouble.
( CF : When COMPOSITE NTSC 3.58MHz, check TP COMB. CCOMB as well)
(4)TP VVS. VHS. VCLK. VPEN1 Check
If VVS. VHS. VCLK. VPEN1 signal do not appear, JACK PCB has a trouble.
3. When DTV (1080i. 720P. 480P ) signal do not appear on screen
(1)Input PC or VIDEO signal and see if PC or VIDEO signals shown on screen
If no signal then check TP DCLKB. DHS. DVS
If DCLKB. DHS. DVS signal do not appear, VIDEO PCB has a trouble.
(2) Check P502 s 1st PIN(V SYNC) , 2nd PIN(H SYNC) check-<when 1080i >