Read Sharp LC-37GA3E (serv.man8) Service Manual online
38
LC-32GA3E
LC-37GA3E
LC-37GA3E
YES
YES
YES
NO
NO
No sound comes out from the headphones.
Check IC2714 and its peripheral circuits.
Check the mute control terminal pin (2) of
IC2702.H:
Active, L: Mute
Are audio output pins (26) and (27) of IC2714
(DIR) as specified?
Are audio output pins (1) and (7) of IC2702
(H/P_AMP) as specified?
Check J2402 (HEAD_PHON_JACK) and its
peripheral circuits.
NO
NO
YES
YES
YES
No sound comes out. (2)
No sound comes out. (3)
Are audio output pins (37) and (36)
(SC1_OUT_L/R) of IC2701 (MUL
TI_SOUND_
PROCESSOR) as specified?
Are audio output pins (7) and (1) of IC2704
(EQ_AMP) as specified?
No monitor audio output comes out.
Is the monitor audio output set to anything other
than "V
ariable"?
Are the headphones disconnected?
Check IC2701 and its peripheral circuits.
Check IC2704 and its peripheral circuits.
NO
YES
Are there audio signal inputs at pins (5) and
(14) of IC1
1
10 (AUDIO_SW)?
Check between IC2704 and IC1
1
10.
NO
YES
Are audio output pins (3) and (13) of IC1
1
10
(AUDIO_SW) as specified?
Is the control signal at pin (10) of IC1
108 as
specified?
YES
Check between IC1
1
10 and
AUDIO OUTPUT
terminal.
Check IC1
108 and its peripheral circuits.
YES
TROUBLE SHOOTING TABLE
(Continued)
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