LG FM300 Service Manual page 34

LGE Internal Use Only
START START
(1) Check the 12V
voltage(TP1)
Yes
(2) Check the 12V
voltage(TP2)
Yes
(3) Check TP3 is high?
Yes
(4) Check the TP4
TP4= 5V
Yes
(4) Check the TP5
TP5= 3.75V
Yes
(4) Check the LTE
module connection
Yes
FINISH
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4. TROUBLE SHOOTING
No
Check soldering CN100
(DC-Jack) or replace
No
Check soldering
Q1 & D1
No
Check the BCM boot
up or not
No
Check the soldering
Q101, R124
No
Check the soldering
U1. If soldering is fine,
replace U1
No
Reassemble the LTE
module or replace
CN300 & LTE module
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