Sharp LC-19S7E-BK, Service Manual

Page: 38 / 193

LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK
38
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
↓ 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
Is the audio signal output of pin (84) (AUOutL) and pin (85)
(AUOutL) of IC U4201 normal? NO Check IC U4201 and its peripheral circuits.
Is audio signal input to pin (5)(LIN), pin (6)(RIN) of IC U6102
(AMP)? NO Check the line between IC U6101 and IC U6102.
Is MUTE/SHUTDOWN circuit [AMP_MUTE, AMP_STBY] normal?
Is the audio signal output of pin (3,4) (LOUT+) and pin (1,2)
(ROUT+) of CN6101 (AUDIO-CONNECTOR) normal?
NO
Check the AMP_MUTE and AMP_STBY. (Q6106, etc.)
NO Check IC U6102 and its peripheral circuits.
Check Speaker Box (right and left) and wire harness.
Is the SIF signal output from pin (13) of TUNER (TU1101)?
Is the SIF signal sent to pin 54(SIFP) and pin 55(SIFM) of IC
U4201?
NO
Check the tuner and its peripheral circuits. Replace as required.
NO
Check IC U4201 its peripheral circuits.
Refer to “ No sound output in all modes ” .
Is the audio signal output of pin (9) (OUTL) and pin (11) (OUTR) of
IC U6101 normal? NO Check IC U6101 and its peripheral circuits.