LG KE600 Service Manual - Page 92
Keypad back light trouble
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5. Trouble shooting 5.10 Keypad back light trouble Check Points -Signal path is connected well -Control IC is working properly VBAT TWH104-HS LD404 R411 47 LD405 R412 47 LD406 R413 47 LD407 R414 47 LD408 R415 47 LD409 R416 47 LD410 R417 47 LD411 R418 47 LD412 R419 47 VA401 EVL5M02200 VA402 EVL5M02200 VA403 EVL5M02200 KEY_BACKLIGHT R420 0 R421 0 Checking Point Check R420 resistor - 93 -
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5. Trouble shooting
- 93 -
5.10 Keypad back light trouble
Check Points
-Signal path is connected well
-Control IC is working properly
Checking Point
VBAT
47
R413
LD407
47
R416
LD409
LD411
LD408
EVL5M02200
VA402
47
R417
R419
47
LD412
0
R421
LD406
EVL5M02200
VA401
47
R412
0
LD410
R420
R411
47
47
LD405
R414
VA403
EVL5M02200
LD404
TWH104-HS
R418
47
47
R415
KEY_BACKLIGHT
Check R420
resistor