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4. TROUBLE SHOOTING
Checking Flow
Check Battery Voltage
And check the level change
into low of PWRKEY
Check the voltage of
The LDO outputs at U104
Logic level at RPWRONN of U104
=
Is the phone power on?
Properly operating.
START
> 3.35V
YES
Push power-on key
YES
VCORE=1.8V
VMEM=2.8V
VEXT=2.8V
YES
VMIC=2.5V
HIGH(above 1.2V)
YES
YES
The phone will
NO
Charge or Change Battery
NO
Check the contact of power key
Or dome-switch
NO
Re-download software
VVCXO=2.75V
VSIM=1.8V or 2.85V
VABB=2.75V
NO
Replace U104
NO
Replace U100 and Re-download software
Does it work properly?
Replace the main board
- 52 -
NO
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