LG 22LS3700 Service Manual page 20

8. Digital TV Audio
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
ok
Check DIF_[P]/[N] Signal
TU3704 Pin 10/11
ok
Follow procedure
'8. All source audio'
trouble shooting guide.
9. Analog TV Audio
Check RF Cable & Signal
ok
Check Tuner 3.3V Power
L3703
ok
Check Tuner 1.8V Power
IC3703 pin 2 : 1.8V
ok
Check SIF Signal
TU3704 Pin 6
ok
Follow procedure
'8. All source audio'
trouble shooting guide.
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Only for training and service purposes
No
Replace L3703
No
Replace IC3703
No
Bad Tuner. Replace Tuner.
No
Replace L3703
No
Replace IC3703 .
No
Bad Tuner. Replace Tuner.
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