Table of Contents
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Checking Flow
START
Is the voltage level VBATT
3.2-4.2V?
Are all LEDs LED404~417
working?
Q400, R410 is working?
Check the signal level at
KEY_BACK_EN=high?
BACKLIGHT WILL
WORK PROPERLY
No
Yes
No
Yes
No
Yes
No
Yes
Charge or Change Battery and try again
Check the soldering of each R or
replace LEDs not working
Check the condition of Q400, R415.
If problem, Change Q400, R415.
Replace MSM
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