Read Sharp LC-37SA1E (serv.man4) Service Manual online
LC-37SA1E/RU/LC-37SV1E/RU
4 – 6
No sound except from speakers (3)
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?
(OP-AMP) normal?
NO
Is audio output signal (SPK-OUT L/R) properly sent from pins
(28) and (27) of IC3002 (VCT)?
(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.
and (33) of the power line, pins (84) and (83) of I2C-LINE, and
peripheral circuits.
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.
NO
Is S-MUTE-LINE [IC1710 (pin 100)] at H?
(Check Q1106/Q1105 operation.)
(Check Q1106/Q1105 operation.)
NO
Is audio signal sent from pins (24) and (23) of IC3002?
NO
Check the power supply 8/5 V pins (18) and (33) of IC3002 and
peripheral circuits.
peripheral circuits.
YES
Check the audio signal output line from pins (24) and (23) of
IC3002 to pins (3) and (1) of EXT1.
IC3002 to pins (3) and (1) of EXT1.
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