Read LG 22LS3500 / 22LS3700 (CHASSIS:LB21A) Service Manual online
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8. Digital TV Audio
9. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
Check DIF_[P]/[N] Signal
TU3704 Pin 10/11
Replace IC3703
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner
.
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
Check SIF Signal
TU3704 Pin 6
Replace IC3703 .
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner
.
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