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4. TROUBLE SHOOTING
4.14 Keypad Backlight Trouble
Key Pad Back Light is on as below :
Key pressing -> KEYD_BACKLIGHT go to about 1V -> LED On
Key Pad Led controlled by PM6650.
Start
Key press
Signal VPWR is OK?
Signal KEYD_BACKLIGHT
is OK?
Signal KYBD_BACKLIGHT
NO
Yes
NO
Yes
R607(VPWR for Key LED)
Serial Resister for Key LED
control
- 106 -
Check R607
Change the Main board
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Troubleshooting
