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4. TROUBLE SHOOTING
4.13 Sub Keypad Backlight Troubleshooting
Sub Key Pad Back Light is on as below :
Key pressing
Æ
LED_CON go down low (below 0.8v)
Æ
Sub Key Backlight LED On
Start
END
Check battery
NO
Yes
Yes
Key press
Check RA101
below 0.8v
+VPWR is above 3.2V?
LED ON ?
Yes
Change the FPCB
OR KEY PCB
NO
Change the MAIN PCB
NO