LG LST-4200A Service Manual - Page 26

When there is no NTSC SPDIF

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(5) When there is no NTSC SPDIF NO Is NTSC audio working normally? YES Does 18.432MHz clock come from NO IC400(57)? YES Does data pulse come from NO IC400(5)? Go to "2. When there is no NTSC Audio." to check. Check IC400. Check IC400. Fig.08 18.432MHz clock coming from IC400(57) 3-17

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3-17
(5) When there is no NTSC SPDIF
Is NTSC audio working normally?
Does 18.432MHz clock come from
IC400(57)?
Go to
“
2. When there is no NTSC
Audio.
”
to check.
NO
Check IC400.
NO
YES
Does data pulse come from
IC400(5)?
Check IC400.
NO
YES
Fig.08
18.432MHz clock coming from
IC400(57)