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Connect to PC with USB cable
TP1 goes from high to low?
TP2 goes from high to low?
(4) Check the signal TP4
LGE Internal Use Only
START
START
Yes
(1) Check (TP1)
Yes
(2) Check (TP2)
Yes
(3) Check the signal
TP3
Yes
Yes
FINISH
Check the Soldering Q300 &
No
R321
If soldering is fine, replace
Q300
No
Check the Soldering R384 &
R309 & R383
Check the Soldering FL302 &
No
CN301
If soldering is fine, replace
FL302
Check the Soldering U300 &
No
CN300
If soldering is fine, replace LTE
module
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4. TROUBLE SHOOTING
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Troubleshooting
