Sharp LC-32GA8 Service Manual page 36

LC-26GA5E
LC-32GA8/LC-32BV8
LC-32GA5E
LC-37GA8/LC-37BV8
Troubleshooting Table (continued)
No audio output from the
headphones
Is there audio output on pins
(2) and (3) of the headphone
terminal (J1301)?
NO
Is audio input/output signal of
pins (3) and (5)/(1) and (7) of
IC303 (OP-AMP) normal?
NO
Is audio output signal (SPK-
OUT L/R) properly sent from
pins (28) and (27) of IC3002
(VCT)?
NO
Check audio input signal of pin (31) of IC3002 (VCT), pins (18)
and (33) of the power line, pins (84) and (83) of I2C-LINE, and
peripheral circuits.
TROUBLESHOOTING TABLE
No sound except from speakers (3)
No audio output from EXT1
(SCART) terminal.
Checklist:
1) Is the MUTE button on the remote control set to ON? ··· Set to OFF.
2) Check the connection to external devices. ··· Is there any improper connection?
Is audio signal sent to pins
(3) and (1) of EXT1 (J1101)?
YES
Check the connection to
EXT1 (J1101) and external
devices.
Is S-MUTE-LINE [IC1710
(pin 100)] at H?
(Check Q1106/Q1105
operation.)
NO
Is audio signal sent from
pins (24) and (23) of
IC3002?
YES
Check the audio signal
output line from pins (24)
and (23) of IC3002 to pins
(3) and (1) of EXT1.
No audio output from EXT2
(SCART) terminal.
Is audio signal sent to pins
NO NO
(24) and (22) of EXT2
(J1101)?
Check the connection to
EXT2 (J1101) and external
devices.
Is S-MUTE-LINE [IC1710 (pin
100)] or S2-MUTE-LINE
[IC3003 (pin 26)] at H?
(Check Q1102/Q1101
operation.)
NO
Check the power supply 8/5
V pins (18) and (33) of
IC3002 and peripheral
circuits.
29
36
(Continued)
No audio output from AUDIO
OUTPUT terminal.
Is audio signal sent to pins
NO
(13) and (15) [L/R (white)
(red)] of AUDIO OUTPUT
terminal (J1201)?
YES
Check the connection to
AUDIO OUTPUT terminal
(J1201) and external devices.
Is S-MUTE-LINE [IC1710 (pin
100)] at H?
(Check Q1204/Q1203
operation.)
NO
NO Is audio signal sent from pins
(22) and (21) of IC3002?
Check the audio signal
output line from pins (22) and
(21) of IC3002 to
Q1103/Q1104/Q1201/Q1202.
LC-32/37GA8E/RU
LC-32/37BV8E/RU
YES
NO
YES