LG LST-4200A Service Manual - Page 23

When there is no NTSC Audio

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(2) When there is no NTSC Audio NO Does ATSC audio sound? YES NO Does SIF signal go into Q400(2)? YES Does SIF signal go into IC400(50)? NO (Fig. 05) YES Does analog audio signal sound at NO IC400(17.18)? Go to "1. When there is no NTSC Audio." to check. Check IC500. Check Q400. Check IC400 and its around circuits. Fig. 05 SIF Signal of IC400(50) 3-14

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3-14
(2) When there is no NTSC Audio
Does ATSC audio sound?
Does SIF signal go into Q400(2)?
Go to
“
1. When there is no NTSC
Audio.
”
to check.
NO
Check IC500.
NO
YES
Does SIF signal go into IC400(50)?
(Fig. 05)
Check Q400.
NO
YES
Does analog audio signal sound at
IC400(17.18)?
Check IC400 and its around circuits.
NO
YES
Fig. 05
SIF Signal of IC400(50)