Sharp AQUOS LC-42XD10E, Service Manual

Page: 37 / 192

LC-42XD10E/RU
4 – 5
No sound except from speakers (3) -1
No audio output from the
headphones. No audio output from
EXT1 (SCART) terminal.
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?
3) Is S-MUTE-LINE [IC1710 (pin92)] at H?
NO
Is audio input/output signal of
pins (3) and (5)/(1) and (7) of
IC303 (OP-AMP) normal? Is audio signal sent to pins
(3) and (1) of EXT1
(J1101)? NO ls S-MUTE-LINE
[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)? Check the connection to
EXT1 (J1101) and exter-
nal devices. Is audio signal sent
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.
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. Check the audio signal
output line from pins
(33) and (34) of IC3701
to pins (3) and (1) of
EXT1.