LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.10 Keypad Backlight Troubleshooting
Key Pad LED Light is on as below :
Key pressing
→
SUB_LED_DRV_N is Low
→
KEYPAD LED Lighting (on)
Start
Change the Main board
Check battery
NO
Yes
Yes
Key press
Change the Main board
Yes
NO
SUB_LED_DRV_N is Low
KEYPAD LED Lighting (on)
KEYPAD LIGHTING
R50
47
CL-435F-WQ-SD-TS
LD4
R51
47
CL-435F-WQ-SD-TS
EDLH0014302
LD3
+VPWR
SUB_LED_DRV_N
KEYPAD LED position