Sharp AQUOS LC-42XD10E, Service Manual

Page: 38 / 192

LC-42XD10E/RU
4 – 6
No sound except from speakers (3) -2
No audio output from
EXT2 (SCART) termi-
nal. No audio output from
AUDIO OUTPUT termi-
nal.
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?
Is audio signal sent to
pins (24) and (22) of
EXT2 (J1101)? NO ls S-MUTE-LINE [IC1710
(pin 92)] or S2-MUTE-
LINE [IC1710(pin 90)] at
H?
(Check Q1102/Q1101
operation.) ls S-MUTE-LINE
[IC1710 (pin 92)] at H?
(Check 1204/Q1203
operation.)
NO
Is audio signal sent to
pins (13) and (15) [L/
R (white) (red)] of
AUDIO OUTPUT ter-
minal (J1201)?
YES NO NO YES
Check the connection to
EXT2 (J1101) and
external devices. Is audio signal sent from pins (36) and (37) of IC3701?
Check the connection
to AUDIO OUTPUT
terminal (J1201) and
external devices.
NO YES
Check the power supply 8/
5 V pins (39) and (12) of
IC3701 and peripheral cir-
cuits. Check the audio signal
output line from pins
(36) and (37) of
IC3701 to Q1103/
Q1104/Q1201/Q1202.