LG LST-4200A Service Manual - Page 24

When there is no ATSC OPTICAL

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(3) When there is no ATSC OPTICAL NO Does ATSC audio sound? YES Does SPDIF pulse come from NO IC203(F3)? YES NO Is 5V supplied into CN400(2)? YES Check CN400 and its around circuits. Go to "1. When there is no NTSC Audio." to check. Check IC203i and its around circuits. Check Power Supply part. Fig.06 SPDIF Output 3-15

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3-15
(3) When there is no ATSC OPTICAL
Does ATSC audio sound?
Does SPDIF pulse come from
IC203(F3)?
Go to
“
1. When there is no NTSC
Audio.
”
to check.
NO
Check IC203i and its around circuits.
NO
YES
Is 5V supplied into CN400(2)?
Check Power Supply part.
NO
YES
Check CN400 and its around circuits.
YES
Fig.06
SPDIF Output