LG FM300 Service Manual page 30

LGE Internal Use Only
START
(1) Check TP1
TP1= Switching Signal
Yes
(2) Check TP2
TP2 = Switching Signal g g
Yes
(3) Check core
voltage(TP3)
TP3= 1.2V
Yes
(4) Check voltage(TP4)
TP4= 2.5V
Yes
(5) Check voltage(TP5)
TP5= 2.5V
Yes
(6) Check XTAL_OUT
Signal (TP6)
TP6= 20MHz
Yes
(7) Check
SFLASH_DATA(TP7) SFLASH DATA(TP7)
TP7= Data pulse
Yes
FINISH
No
Check the R140 Soldering
No
Check the R141 Soldering
No
Check Soldering Q102, Q103 L102
If soldering is fine, replace them
No N
Check the R152 Soldering
No
Check the Q104 Soldering
If soldering is fine, replace Q104
No
Check the X400 Soldering
If soldering is fine, replace X400
No
Check the U202 Soldering
If soldering is fine, replace U202 If ld i i fi
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4. TROUBLE SHOOTING
l U202
Only for training and service purposes