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5 Troubleshooting
5-4 LTM1555(B)/LTM1755(B)
Does the signal appear at
Pin 67 (Tuner sound signal) and
Pin 57, 56 (PC sound) and Pin 51, 50
(VCR sound) of IC53 (MSP3421G)?
Check CN11 (PC conector)
and CN26(VCR connector).
Yes
No
Does the signal appear at Pin 27,
28 of IC53 (MSP3421G)?
Check IC32 and related circuit.
Yes
No
Does the signal appear
at L53~L56?
Check IC55 (Audio amp) and related circuit.
Yes
No
Replace the speaker.
5-4 No Sound