LG KU950 - Keypad Backlight Trouble

4. TROUBLE SHOOTING
- 116 -
4.14 Keypad backlight trouble
Key Pad Back Light is on as below :
Key pressing → KYPD_LED_EN go to Low → LED On
Key Pad LED controlled by PM6650.
Start
Check the serial resister
For each LED
Check LD900~910 (Main)
and R100~103 (Key)
NO
Yes
Yes
Key press
Change the Main or
KEY Board.
NO
Signal KYPD_LED_EN
is OK?
Signal VPWR is OK?
Work well?
End
NO
Yes
VPWR(LD100~103_KEY, LD900~910_Main)
KYPD_LED_EN(VA908,VA101)