Protection Error - LG SK6Y Service Manual

3. PROTECTION ERROR

No display or No Sound.
3-1. D(DC) PROTECTION
3-1-1. Solution
Replace MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check DC Voltage of speaker out FL+/-, TWL+/- (CN703 pin1, 2, 3, 4), FR+/-, TWR+/- (CN704 pin1, 2, 4, 5).
2) Check resistor crack, cold solder of PWM IC out (AR601, AR602).
3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-) has DC voltage,
replace MAIN bottom board.
3-1-3. Service hint (Any picture / Remark)
IC600 IC600
ONE POINT REPAIR GUIDE
< MAIN board top view >
Copyright © 2018 LG Electronics Inc. All rights reserved.
3-11
CN703 CN703
CN704 CN704
Only for training and service purposes.