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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.14 Keypad Backlight Troubleshooting
Key Pad Back Light is on as below :
Key pressing
→
KPD_DRV_N go to 0V
→
Key Backlight LED On
Start
Check ba ttery
NO
Yes
Key press
Change the Main bo ard
or Check t he Key FPCB
Yes
NO
+VPWR is abov e 2.6V?
KPD_DRV_N is 0V ?
Yes
Check an U100 SMT status
by X-ray
Exc hange U100 o r
Change the Main board
And Retest
Summary of Contents for CT815
Page 1: ...Date May 2009 Issue 1 0 Service Manual Model CT815 Service Manual CT815 Internal Use Only ...
Page 221: ...Note ...
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