LG GX200 - Sub Key LED Backlight Trouble

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4.6 Sub Key LED backlight Trouble
4.6.1 Test Point
Voltage PART
KD101.2 2.6~2.9 V TP1(KD101.2)
KD102.2 2.6~2.9V TP2(KD102.2)
KP_LEDIN >0.2V TP3(RJ1401.2)
KEY_LED >0.2V TP4(R1401.1)
TP1
TP2
TP4
TP3