LG LST-4200A Service Manual - Page 22

Is 9V supplied to IC4028?

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3) Check IC402 and its around circuits. NO Is 9V supplied to IC402(8)? YES Does analog signal come from NO IC402(1, 7)? Check Power Supply part. Check IC402 and its around circuits. 4) Check the output jacK and its around circuits. Check CN301 and its around circuits. 3-13

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3-13
Is 9V supplied to IC402(8)?
Does analog signal come from
IC402(1, 7)?
Check Power Supply part.
NO
Check IC402 and its around circuits.
NO
YES
3) Check IC402 and its around circuits.
Check CN301 and its around circuits.
4) Check the output jacK and its around circuits.