Read LG 26LG4000 (CHASSIS:LD86A) Service Manual online
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11. DVD doesn’t display
Check Pin 8(DVDP_Y input), Pin 7(DVDP_Pb input)
and Pin 6(DVDP_Pr input) of P1200 wafer.
Can you see the normal waveform?
YES
NO
Check the soldering condition of P1200
Check the input(SW_COMP_Y:R1273,
DVDP_Pr:R1277, DVDP_Pb:R1275) of
DVDP_Pr:R1277, DVDP_Pb:R1275) of
LGE7363(IC100).
Especially you should check the H,V sync and clock.
Can you see the normal waveform?
YES
This board has big problem because Main
chip(LGE7363) have some troubles.
After checking thoroughly all path once again, You
should decide to replace LGE7363 or not.
YES
It may be occurred in the DSS-863 DVD Loader.
You can change other DSS-863 DVD Loader and
You can change other DSS-863 DVD Loader and
check again.
Check the connection P1201 between main B/D and
DSS-863 DVD Loader.
Check the connection P1202 between main B/D and
DSS-863 DVD Loader.
Check the connection P1200 between main B/D and
DSS-863 DVD Loader.
YES
Fix the 4pin cable well on the P1201 and the connection
wafer of DSS-863 DVD Loader.
NO
Fix the 6pin cable well on the P1202 and the connection
wafer of DSS-863 DVD Loader.
Fix the flat cable well on the P1200 and the connection
wafer of DSS-863 DVD Loader.
NO
YES
YES
NO
If the changed DSS-863 loader is operated well,
before DSS-863 loader have the problem itself.
You might change the new DSS-863 DVD Loader.
YES
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