LG FM300 Service Manual page 26

LGE Internal Use Only
START
(1) Check the 12V
voltage(TP1)
Yes
(2) Check the 12V
voltage(TP2)
Yes
(3) Push the PWR S/W
Check TP3 is high?
Yes
(4) Check the TP4
TP4= 3.3V
Yes
FINISH
No
Check soldering CN100(
DC-Jack) or replace
No
Check soldering
Q1 & D1
No
Check soldering CN102&
R14.
No
Check soldering of U2 or
replace
- 6 - Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Only for training and service purposes