No Sound - Panasonic PT-TW230U Service Manual

Troubleshooting

No sound

Check following steps.
Check if the audio sig-
nal is observed at pins
7 and 15 of IC5001.
Yes
Check if the audio sig-
nal is observed at pins
20 and 23 of IC001.
Yes
Check audio output circuit.
Check speaker, connection of the terminal "K8F".
No
Check IC5001 and peripheral circuit.
Check the 12V power supply.
Check IC001 and peripheral circuit.
No
Check the Mute signal at pin 1 of IC001. The Mute signal is output from
pin 267 of IC 301<Scaler>.
The OUT_DET signal is sent from Audio Out terminal.
Mute-On: H at pin 267 of IC301, L at pin 1 of IC001.
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