LG LST-4200A Service Manual - Page 36

IC203F11 <FIG.07&gt - dtv tuner

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Page 36 highlights

(B) YES Is analog component on the Mute mode? YES Check analog buffers. Check IC304 used in the composite & S-video out and IC303 used in the component YPbPr & RGB analog. YES NG OK Go to (A) flow. It is not OSD problem. Check DVI output. Check Power Supply part. In the case of (C1) _ DTV, NO Check if there is input stream. Is there any problem? NO Is there decoding problem? NO END YES NG Check tuner part. Check signal intensity. Check if system clock 27MHz comes from IC206(9), when signal is normal. OK Check HD 2 interrupt request signal. IC203(F11) 3-27

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3-27
Is analog component on the Mute
mode?
(B)
(B)
Check analog buffers.
Check IC304 used in the
composite & S-video
out and IC303 used in the
component YPbPr & RGB analog.
It is not OSD problem.
Check DVI output.
YES
Check Power Supply part.
NG
Check tuner part.
YES
Check signal intensity.
Check if system clock 27MHz
comes from IC206(9), when signal
is normal.
Check HD 2 interrupt request signal.
IC203(F11) <FIG.07>
NG
OK
YES
YES
Check if there is input stream.
Is there any problem?
In the case of (C1) _ DTV,
Is there decoding problem?
END
NO
NO
NO
OK
Go to (A) flow.