Read Sharp LC-42XD1EA (serv.man4) Service Manual online
LC-42XD1EA/RUA
4 – 5
No sound except from speakers (3) -1
No audio output from the
headphones.
headphones.
No audio output from
EXT1 (SCART) terminal.
EXT1 (SCART) terminal.
Is there audio output on pins
(2) and (3) of the headphone
terminal (J1301)?
(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?
3) ls S-MUTE-LINE [IC1710 (pin 92)] at H?....It is defective. Check the IC1710.
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?
3) ls S-MUTE-LINE [IC1710 (pin 92)] at H?....It is defective. Check the IC1710.
NO
Is audio input/output signal of
pins (3) and (5)/(1) and (7) of
IC303 (OP-AMP) normal?
pins (3) and (5)/(1) and (7) of
IC303 (OP-AMP) normal?
Is audio signal sent to pins
(3) and (1) of EXT1
(J1101)?
(3) and (1) of EXT1
(J1101)?
NO
ls S-MUTE-LINE
[IC1710 (pin 92)] at H?
(Check Q1106/Q1105
operation.)
[IC1710 (pin 92)] at H?
(Check Q1106/Q1105
operation.)
NO
YES
NO
Is audio output signal (SPK-
OUT L/R) properly sent from
pins (28) and (27) of IC3701
(MSP)?
OUT L/R) properly sent from
pins (28) and (27) of IC3701
(MSP)?
Check the connection to
EXT1 (J1101) and exter-
nal devices.
EXT1 (J1101) and exter-
nal devices.
Is audio signal sent
from pins (33) and (34)
of IC3701?
from pins (33) and (34)
of IC3701?
NO
Check the power supply
8/5 V pins (39) and (12)
of IC3701 and periph-
eral circuits.
8/5 V pins (39) and (12)
of IC3701 and periph-
eral circuits.
NO
YES
Check audio input signal of pin
(67) of IC3701(MSP), pins
(39) and (12) of the power
line5 and 8V, pins (3) and (2)
of I2C-LINE, and peripheral
circuits.
(67) of IC3701(MSP), pins
(39) and (12) of the power
line5 and 8V, pins (3) and (2)
of I2C-LINE, and peripheral
circuits.
Check the audio signal
output line from pins
(33) and (34) of IC3701
to pins (3) and (1) of
EXT1.
output line from pins
(33) and (34) of IC3701
to pins (3) and (1) of
EXT1.
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