Sharp LC-26SB25E, Service Manual

Page: 39 / 172

2008-03-14
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU
39
The sound is not emitted from the speaker though the picture has come out.
↓
No sound output in all modes?
TEREMINAL UNIT:
↓
↓
YES
↓
YES
↓
YES
↓
YES
No sound (during the reception of TV(ANALOG) broadcasting)
↓
Does not the sound go out though the picture has come out when UHF/VHF is received?
TEREMINAL UNIT:
↓
↓
YES
↓
YES
No sound (during the reception of TV (DIGITAL) broadcasting)
↓
Does not the sound go out though the picture has come out when DTV is received?
MAIN UNIT:
↓
↓
YES
↓
YES
Is the audio signal output of pin (F26) (AL1) and pin (G25) (AR1) of
IC U400 normal? NO Check IC U400 and its peripheral circuits.
Is audio signal input to pin (2)(L), pin (14)(R) of IC U600 (AMP)? NO Check the line between IC U400 and IC U600.
Is MUTE circuit [AMP_MUTE_LINE, POWERUP_LINE] normal?
Is the audio signal output of pin (2, 1) (L-ch) and pin (1, 2) (R-ch) of
CN600 & CN601(AOUDIO-CONNECTOR) normal?
NO Check the AMP_MUTE_LINE and POWERUP_LINE. (Q600,
etc.)
NO Check IC U600 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
Is the SIF signal output from pin (11) of TUNER (TU200)?
Is the SIF signal sent to pin (P25) and pin (P26) of IC U400?
NO Check the tuner and its peripheral circuits. Replace as required.
NO Check IC U400 its peripheral circuits.
Refer to “ No sound output in all modes ” .
Is the DIF signal output from pin (17) and pin (19) of TUNER
(TU200)?
NO
Check the tuner and its peripheral circuits. Replace as required.
Refer to “ No sound output in all modes ” .
Is the DIF signal sent to pin (44) and pin (43) of IC U231?
NO
Check IC U231 its peripheral circuits.