LC-37GA9EK (serv.man8). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 4

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35
 LC-26GA5E
 LC-32GA5E
  LC-32GA9E/LC-32BV9E
  LC-37GA9E/LC-37BV9E
Troubleshooting Table (continued)
31
LC-32/37GA9E
LC-32/37BV9E
TROUBLESHOOTING TABLE
 (Continued)
No sound except from speakers (3)
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.
NO
NO
NO
NO
No audio output from the 
headphones
No audio output from EXT1 
(SCART) terminal.
NO
Is there audio output on pins 
(2) and (3) of the headphone 
terminal (J1301)?
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 input/output signal of 
pins (3) and (5)/(1) and (7) of 
IC303 (OP-AMP) normal?
NO
NO
YES
YES
NO
YES
NO
NO
NO
YES
YES
Is audio output signal (SPK-
OUT L/R) properly sent from 
pins (28) and (27) of IC3002 
(VCT)?
Check the connection to 
EXT1 (J1101) and external 
devices.
Check the connection to 
EXT2 (J1101) and external 
devices.
Is S-MUTE-LINE [IC1710 (pin 
21)] or S2-MUTE-LINE 
[IC3003 (pin 26)] at H?
(Check Q1102/Q1101 
operation.)
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
Check the connection to 
AUDIO OUTPUT terminal 
(J1201) and external devices.
Is S-MUTE-LINE [IC1710 (pin 
21)] at H?
(Check Q1204/Q1203 
operation.)
Is audio signal sent to pins 
(3) and (1) of EXT1 (J1101)?
Is S-MUTE-LINE [IC1710 
(pin 21)] at H?
(Check Q1106/Q1105 
operation.)
Is audio signal sent from 
pins (24) and (23) of 
IC3002?
Check the audio signal 
output line from pins (24) 
and (23) of IC3002 to pins 
(3) and (1) of EXT1.
Check the power supply 8/5 
V pins (18) and (33) of 
IC3002 and peripheral 
circuits.
Is audio signal sent to pins 
(24) and (22) of EXT2 
(J1101)?
Is audio signal sent to pins 
(13) and (15) [L/R (white) 
(red)] of AUDIO OUTPUT 
terminal (J1201)?
No audio output from EXT2 
(SCART) terminal.
No audio output from AUDIO 
OUTPUT terminal.
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