LG M6100 Service Manual - Page 71

The LDO outputs at U101

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4. TROUBLE SHOOTING Checking Flow START NO Check Battery Voltage > 3.35V ? YES Push power-on key NO And check the level change of PWRKEY YES Check the voltage of NO The LDO outputs at U101 Charge or Change Battery Check the contact of power key Or dome-switch Replace U101 YES VCORE=1.8V VMEM=2.8V VEXT=2.8V VABB=2.75V VVCXO=2.75V VRTC=1.8V VSIM=2.85V (when sim card is inserted) VMIC=2.5V NO Logic level at KEYON of U101 = HIGH YES NO Does it work properly? Re-download software Does it work properly? The power-on procedure is Completed. The problem may NO YES be elsewhere. THE PHONE WILL POWER ON. Replace the main board - 72 -

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4. TROUBLE SHOOTING
- 72 -
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 U101
Logic level at KEYON of U101
= HIGH
Does it work properly?
THE PHONE WILL
POWER ON.
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U101
VCORE=1.8V
VVCXO=2.75V
VMEM=2.8V
VRTC=1.8V
VEXT=2.8V
VSIM=2.85V (when sim card is inserted)
VABB=2.75V
VMIC=2.5V
Re-download software
The power-on procedure is
Completed. The problem may
be elsewhere.
Does it work properly?
Replace the main board
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Checking Flow