Daewoo DPC-7900 Series, Serivce Manual

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D. If the above actions do not work, then check U17 Pin179 and Pin181 to see
if there is Y and C signals.
E.
If the above actions are not working, replace the Main Board.
T24 VCD abnormal picture
Main Board
A.
Check main board to see if there is any cold or hollow soldering and short
circuit problem and rule out the problem.
B.
Check the resistors or capacitors adjacent to IC(U17) to see if there is any
hollow soldering, cold soldering, wrong part, or misplaced soldering.
C. If the above actions are not working, replace the Main Board.
DVD ROM
A.
If the abnormal picture is the problem of pause or skipping tracks, then making
sure if the disc has any scratches or dirt, if no such problems then replace the
loader.
T25 DVD abnormal picture
Main Board
A. Check U
17
to see if there is any cold or hollow soldering and short
circuit
problem and rule out the problem.
B.
Check the resistors or capacitors adjacent to IC
(U17)
to see
if there is any
hollow soldering, cold soldering, wrong part, or misplaced soldering.
C. If the above actions are not working, replace the Main Board.
DVD ROM
A.
If the abnormal picture is the problem of pause or skipping tracks, then making
sure if the disc has any scratches or dirt, if no such problems then replace the
loader.
T26 Picture subtitle abnormal display or no display
Main Board
A.
Remove the top cover and dis-assemble F/W (U 17 ). Replace it with a good
F/W or re-plug it, then check if the action is normal. Otherwise replace the F/W.
B. Check U
17
to see if there is any cold or hollow soldering and short
circuit
problem and rule out the problem.
C. If the above actions are not working, replace the Main Board.
T27 Setting menu abnormal picture
Main Board
A.
Check U
17
to see if there is any cold or hollow soldering and rule out the
problem.