Sharp LC-26SH7E/RU Service Manual page 85

No sound output in all modes?
TEREMINAL UNIT:
Is the audio signal output of pin (H26) (AL0) and pin (H25) (AR0) of
IC U400 normal?
Is the audio signal output of pin (17) (PGA2OUTL) and pin (18)
(PGA2OUTR) of IC U605 normal?
Is audio signal input to pin (2)(L), pin (14)(R) of IC U600 (AMP)?
Is MUTE circuit [AMP_MUTE_LINE, POWERUP_LINE] normal?
Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of
CN600 (AOUDIO-CONNECTOR) normal?
Check Speaker Box (right and left) and wire harness.
Does not the sound go out though the picture has come out when UHF/VHF is received?
↓
TEREMINAL UNIT:
Is the SIF signal output from pin (21) of TUNER (TU201)?
Is the SIF signal sent to pin (AB25) and pin (AB26) of IC U400?
Refer to "No sound output in all modes".
The sound is not emitted from the speaker though the picture has come out.
↓
↓
↓YES
↓YES
↓YES
↓YES
↓YES
No sound (during the reception of TV(ANALOG) broadcasting)
↓
↓YES
↓YES
2008-03-14
LC-19SH7E/RU, LC-26SH7E/RU, LC-32SH7E/RU, LC-42SH7E/RU
NO Check IC U400 and its peripheral circuits.
NO
Check IC U605 and its peripheral circuits.
NO
Check the line between IC U605 and IC U600.
NO
Check the AMP_MUTE_LINE and POWERUP_LINE. (Q600,
etc.)
NO Check IC U600 and its peripheral circuits.
NO
Check the tuner and its peripheral circuits. Replace as required.
NO
Check IC U400 its peripheral circuits.
85