Keypad Backlight Troubleshooting - LG CT815 Service Manual

4. TROUBLE SHOOTING

4.14 Keypad Backlight Troubleshooting

Key Pad Back Light is on as below :
→
Key pressing KPD_DRV_N go to 0V
+VPWR is above 2.6V?
KPD_DRV_N is 0V ?
Check an U100 SMT status
by X-ray
Exc hange U100 o r
Chang e th e Main bo ard
And Rete st
LGE Internal Use Only
→
Key Backlight LED On
Start
Key press
NO
Yes
NO
Yes
- 134 -
Check ba ttery
Yes
Chang e th e Main bo ard
or Check t he Key FPCB
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