Eiki LC-XB42, Service Manual

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Troubleshooting
No Sound
Check IC5001 and peripheral circuit.
Check 5V_AUDIO, 12V power supply.
Check if the audio sig-
nal is observed at pins 7
and 15 of IC5001.
Check audio output circuit.
Check speaker, connection of the terminal “K8F”
Yes
No
Check following steps.
Check IC5031, 5V_AUDIO and peripheral circuit.
Check the Mute signal at pin 1 of IC5031. The Mute signal is output from
pin 92 of IC 301<Scaler>. The OUT_DET signal is sent from Audio Out
terminal.
Mute-On: H at pin 347 of IC301, L at pin1 of IC5031
Check if the audio sig-
nal is observed at pins 5
and 8 of IC5031.
Yes
No