Table of Contents
Advertisement
4. TROUBLE SHOOTING
Checking Flow
START
Check Battery Voltage
> 3.35V ?
Push power-on key
And check the level change
of POWERKEY
Check the voltage of
The LDO outputs at U102
Logic level at KEYON of U102
Does it work properly?
THE PHONE WILL
POWER ON.
NO
YES
NO
YES
NO
VCORE=1.8V
VMEM=2.8V
YES
VEXT=2.8V
VABB=2.75V
NO
= HIGH
YES
NO
The power-on procedure is
Completed. The problem may
YES
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U102
VVCXO=2.75V
VRTC=1.8V
VSIM=1.8V or 2.85V
VMIC=2.5V
Re-download software
Does it work properly?
be elsewhere.
- 64 -
NO
Replace the main board
Advertisement
Table of Contents
