LG 42LK430 - TV Audio Troubleshooting; Digital TV Audio Issues; Analog TV Audio Issues

- 20 -
LGE Internal Use OnlyCopyright ©2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
10. Digital TV Audio
Check RF Cable & Signal.
Follow procedure
’9. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703.
Replace L3703.
Check Tuner 1.8V Power.
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin.
Replace IC3703.
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
11. Analog TV Audio
Check RF Cable & Signal.
Follow procedure
’9. All source audio’
trouble shooting guide.
ok
Check Tuner 3.3V Power
L3703.
Replace L3703.
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V.
Check CVBS Signal
TU3700 8 Pin.
Replace IC3703.
ok
ok
ok
No
No
No
Bad Tubner. Replace Tuner.