LG PRADA KE850 - Page 77

5. Trouble shooting
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START
"PWRON" signal
= VBAT?
"_RESET" signal
goes to high?
Check the all
LDO's output
Is it correct?
Is the 26MHz
clock From U402
signal correct?
Replace main PCB
Check the
RPWRON,
replace U204
Check solder
U206 or replace it
Check solder
U201 or replace it
Check solder
X401, U403
or replace it
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Connect power
supply to the DUT
Vbat = over 3.35V