Key Backlight Led Trouble - LG G3100 Service Manual

4. TROUBLE SHOOTING

4.11 Key Backlight LED Trouble

SETTING : Connect PIF to the phone, and power on. Enter engineering mode, and set
"Backlight on" in "at" "BB test-Backlight" menu
Replace Q202, and try again
START
PIF Power On
Is the voltage
level at Pin1 at
O202 about
1.2V?
Yes
Are all LEDs
LD201~LD206 not
working
Yes
Yes
Backlight LED
Working!!
Check the soldering of
No
R234,R236
Check the soldering or
No
Replace LEDs not working
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