Sharp LC-22LE320 Service Manual page 70

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
Is the HP_DET# signal input into pin (AE6) of IC U401 from pin (6)
of a headphone terminal (CN602)?
Is the audio signal output from IC U602 to pin(2) (HPOUTL) and pin
(3) (HPOUTR) of headphone terminal CN602?
Is the audio signal output from IC U401 pin(V35) and pin(U34) sent
to pin(1)(INL-) and pin(4)(INR-) of IC U602?
Check IC U401 and its peripheral circuits.
The audio signal is not output (4)
↓
↓
↓YES
↓YES
↓YES
NO Check the connection to CN602 and external headphone is plug
in well.
NO
Check the line between IC U602 and CN602.
NO
Check the line between IC U401 and IC U602.
70