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4. TROUBLE SHOOTING
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4.14 Keypad Backlight Troubleshooting
Key Pad Back Light is on as below :
Key pressing → KYBD_BACKLIGHT go to 0V → MAIN Key Backlight LED On
Figure.Keypad backlight LED part
Start
Change the Main board
Check battery
NO
Yes
Yes
Key press
Change the Main board
Yes
NO
+VPWR is above 3.2V?
KYBD_BACKLIGHT is 0V ?
Backlight LED ON?
No
END
YES
+VPWR
KEY_BACK_LIGHT LED(8EA)
REV_B : EDLH0013501 --> EDLH0006001
R418
100ohm
100ohm
R415
100ohm
R411
R413 100ohm
LD408
LEBB-S14H
LEBB-S14HLD405
LD406 LEBB-S14H
R414
100ohm
LD400 LEBB-S14H
100ohm
R417
LD404 LEBB-S14HLEBB-S14HLD403
100ohmR416
LEBB-S14HLD402
R419 100ohm
LEBB-S14HLD407
+VPWR
KYBD_BACKLIGHT