LG LST-4200A Service Manual - Page 34

Fig.01 - power problem

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(A) YES NO Is power supplied into IC203? YES Is Video Display Clock(IC206(7)) NO supplied into HD2? YES Switch the Display Color into RGB/DVI. Check HV sync. Is there any problem? YES NO END Check Power Supply part. Check IC204(5) and IC206(1). YES Check IC204(1,8) and X200 when it is sine curve form « 27MHz clock.? Check if IC202(1) is low when HV sync is exited at IC202 (6,7)(FIG.04)(FIG.05). Fig.01 VDP Clock 3-25

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3-25
Is power supplied into IC203?
(A)
Is Video Display Clock(IC206(7))
supplied into HD2? <FIG.01>
Check Power Supply part.
NO
Check IC204(5) and IC206(1).
<FIG.02.>
NO
YES
YES
YES
Switch the Display Color into RGB/DVI.
Check HV sync. Is there any problem?
END
Check if IC202(1) is low when HV sync
is exited at IC202 (6,7)(FIG.04)(FIG.05).
Check IC204(1,8) and X200 when it is sine
curve form
«
27MHz clock.? <FIG.03>
NO
YES
YES
Fig.01
VDP Clock