LG 32LG7000, Руководство по обслуживанию

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- 17 - Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Check Tuner
1. VDD Check -> TU300 pin22:1.8V
pin21: 3.3V
pin4:5V
2. IIC check -> pin10,11
Check ATV signal
1. Video signal
-> TU Main Signal : R336
-> Tuner V-out:C318
Replace TU300.
Check Front END IC100
1. Check C518
Check DTV signal
1. TP signal -> Pin 24~34
2. IIC check -> pin 18,19
Replace TU300.
NG : DTV
Check ATV sound signal
1. Sound signal
-> SIF : R317
-> SECAM-L sound:R326
NG : DTV
Check sound processor
1. IC603 pin50 for SIF(RF sound)
2. IC603 pin47 for SECAM-L sound
Check App S/W.
If App S/W OK then replace IC603.
Check Digital AMP
1. VDD 16V:IC600 pin49~52, 32~35
VDD 1.8V:IC600 pin2, 13, 16
2. Mute check:IC600 pin25
No problem
NG
No
problem
No problem
No problem
Check App S/W
If App S/W OK then replace IC600.
NG
NG : DTV
NG
NG
Replace Main B/D.
NG
Check App S/W.
If App S/W OK then
replace IC100.
2-2. In case of abnormal display or sound when RF mode
Replace TU300.
NG
NG
Check App S/W.
If App S/W OK then replace Main B/D.