LG LST-4200A Service Manual - Page 25

When there is no ATSC COAXIAL SPDIF

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(4) When there is no ATSC COAXIAL SPDIF NO Is 5V supplied into Q401? YES Does SPDIF pulse come from NO IC203(F3)? YES Does SPDIF signal come from NO Q401(1)? YES Check CN301(S4,G4) and its around circuits. Check Power Supply part. Check IC203 and its around circuits. Check Power Supply part. Fig.07 SPDIF Output 3-16

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3-16
(4) When there is no ATSC COAXIAL SPDIF
Is 5V supplied into Q401?
Does SPDIF pulse come from
IC203(F3)?
Check Power Supply part.
NO
Check IC203 and its around circuits.
NO
YES
Does SPDIF signal come from
Q401(1)?
Check Power Supply part.
NO
YES
Check CN301(S4,G4) and its around
circuits.
YES
Fig.07
SPDIF Output