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Checking Flow
START
Turn on the phone
Is the voltage level +VPWR
(R301,R328,R307,R309,R310,R314,R325,R377~R386)
3.2-4.2V?
Check LEDs' directions
Check the signal level at
KYPD_EN=high?
BACKLIGHT WILL
WORK PROPERLY
NG
OK
No
Yes
NG
OK
No
Yes
Charge or Change Battery and try again
Check the soldering of each R or
Replace them.
Re-solder or replace LEDs
Replace QSC
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