LG KG270 Service Manual - Page 54
Power On Trouble
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4. TROUBLE SHOOTING Power On Trouble CHECKING FLOW START Check Battery Voltage > 3.35V YES Push power-on key And check the level change of PWRKEY YES Check the voltage of The LDO outputs at U102 NO Charge or Change Battery NO Check the contact of power key Or dome-switch NO Replace U102 YES THE PHONE WILL POWER ON. LDO VOLTAGE PART V_BUF 3.2V C101 V_MEM 2.8V C109 V_IO 2.8V C107 V_SIM 2.85V C108 VRF0 1.5V C110 V_ANA 2.5V C113 - 55 -
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4. TROUBLE SHOOTING
- 55 -
Power On Trouble
CHECKING FLOW
START
Check Battery Voltage
> 3.35V
Push power-on key
And check the level change
of PWRKEY
Check the voltage of
The LDO outputs at U102
THE PHONE WILL
POWER ON.
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U102
YES
YES
YES
NO
NO
LDO
VOLTAGE
PART
V_IO
2.8V
C107
V_BUF
3.2V
C101
V_MEM
2.8V
C109
V_ANA
2.5V
C113
V_SIM
2.85V
C108
VRF0
1.5V
C110
NO