Read Sharp LC-37GA5E (serv.man6) Service Manual online
39
LC-26GA5E
LC-32GA5E
LC-32GA5E
LC-37GA5E
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
No audio output (5)
No FM sound.
Confirmation of the settings:
1) Is the MUTE button of REMOCON set to ON?
… Set to OFF
.
2)
Are headphones connected to HEADPHONE (J402)?
… Disconnect.
3) Is FM-ANT
-CABLE disconnected or is there a connection error?
… Connect according to the operation manual.
4) Is "VOLUME" in MENU-SOUND-LEVELS-SPEAKERS-VOLUME set to "MIN=0"?
… Set to the desired value between "0-100".
Are audio signals (SP
L/R) sent from
the pins (123)(124) of IC1001 (VCTI)?
Are audio output signals of the pins
(1)(7) of IC1351 (H-PHONE-AMP)
normal?
Are audio input signals of the pins
(1
1)(15) of IC1301 (AUDIO-AMP-IC)
normal?
Are audio output signals of the pins
(28)(31)/(24)(27) of IC1301 (AUDIO-
AMP-IC) normal?
Check the connector (P1301) and the
left and right SP-boxes.
Check IC1351 or its peripheral
circuits.
Check HEADPHONE-JACK
(J402) or its peripheral circuits.
Check IC1301 and its peripheral
circuits.
Check SF1201 and its peripheral
circuits.
Are IF signals (IF+/IF-) supplied to the
pins (109)(1
10) of IC1001 (VCTI)?
Check if +8V
, +5V and +3.3V are
supplied to the pins (126), (106) and
(105) of IC1001 respectively
. Or check its
peripheral circuits.
Is FM-IF signal sent from the pin (10)
of TUNER
(TU1201)?
Check if power of 33V/5V is supplied
to the pins (9)/(7) of
TUNER
(TU1201). Or check its peripheral
parts.
Is FM-IF signal sent from the pin (4) of
IC1201 (MIXER)?
Troubleshooting Table (continued)
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