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Only for training and service purposes
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4. TROUBLE SHOOTING

4.7 Slide Key side view LED Troubleshooting

Sub Key Pad Slide is on as below:

Key pressing ÆLED_CON go down low (below 0.8v) ÆSub Key Backlight LED On

Slide Key side view LED Troubleshooting
START
+VPWR is above 3.2V? Check battery
No
Yes
END
Change the FPCB
or KEY PCB
No
LED ON ? Change the MAIN PCB
No
Yes
Key press
When the LCD is on,
TP2 is below 0.8v?
Yes