Sharp LC-26SB25E Service Manual page 43

No audio signal output from SPDIF_OUTPUT terminal.
TEREMINAL UNIT:
Is ASPDIF audio signal output from pin (B22) of IC U400 to pin (6)
of connector CN553?
Check IC U400 and its peripheral circuits.
No sound from HEADPHONE_OUTPUT terminal.
MINI AV_UNIT:
Is the HPDET signal input into pin (C20) of IC U400 from pin (7) of
a headphone terminal (CN602)?
Is the audio signal output from IC U601 to pin (2) (HPOUTL) and
pin (3) (HPOUTR) of headphone terminal CN602?
Is the audio signal output from IC U400 of pin (F26) (AL1) and pin
(G25) (AR1) sent to pin (2)(VIN1) and pin (6)(VIN2) of IC U601?
Check IC U400 and its peripheral circuits.
The audio signal is not output (4)
↓
↓
↓NO
The audio signal is not output (5)
↓
↓
↓YES
↓YES
↓YES
2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
YES Check the connection to SPDIF_OUT and external devices.
NO Check the connection to CN602 and external headphone is plug
in well.
NO Check the line between IC U601 and CN602.
NO Check the line between IC U400 and IC U601.
43