LG KP175 - KEY Backlight Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
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4.12 KEY backlight Trouble
TEST POINT
CIRCUIT
VA40 1
KEY BACKLIGHT
LD405
LD401
SSC-TWH104-HL
LD407
47
R414R413
47
R410
47
VA401
ICVN0505X150FR
47
R407 R409
47
LD402
47
R412R411
47
LD403
DNI
C408
ICVN0505X150FR
VA400
SSC-TWH104-HL
LD406
LD400
47
R408
VBAT
LD404
KEY_BACKLIGHT
Figure 4.12