LG 42CS560 Service Manual page 20

10. Digital TV Audio
Check RF Cable & Signal.
ok
Check Tuner 3.3V Power
L3703.
ok
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
ok
Check IF_P/N Signal
TU3700 10/11 Pin.
ok
Follow procedure
'9. All source audio'
trouble shooting guide.
11. Analog TV Audio
Check RF Cable & Signal.
ok
Check Tuner 3.3V Power
L3703.
ok
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V.
ok
Check CVBS Signal
TU3700 8 Pin.
ok
Follow procedure
'9. 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 Tubner. Replace Tuner.
- 20 - LGE Internal Use Only