LG FM300 Service Manual page 46

(1) Check Output voltage(TP1)
LGE Internal Use Only
START
TP1= 3.75V
Yes
(2) LQI_LED0 is high and
Red LED turn on?
Yes
(2) LQI_LED1 is high and
Green LED turn on?
Yes
FINISH
No
Check the Soldering U1
If soldering is fine, replace U1
Check the Soldering
No
Q305&R355&LD304
If soldering is fine, replace
Q305 or LD304
Check the Soldering
No
Q306&R353&LD304
If soldering is fine, replace
Q306 or LD304
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4. TROUBLE SHOOTING
Only for training and service purposes