LG CT815 Service Manual page 138

1) Measurement : U505
-. VCC : VREG_MSMP_2.6V (C524, C525)
-. PROX_LEDON : 17.5 kHz pulse (TP504)
-. PROX_ADC : 0.2 ~ 2.6 V (R520, C526)
PROX_LEDON
PROX_EN_N
PROX_OUT
VREG_MSMP_2.6V
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Only for training and service purposes
Proximity Sensor
EUSY0358201
VREG_MSMP_2.6V
TP504 U505 APDS-9700
1 8
LEDON VCC
2 7
ENB LEDA
3 6
DOUT PFILT
4 5
GND PD
PGND
9
PROX_ADC
Figure. Engineer Mode Proximity Test
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4. TROUBLE SHOOTING
C524 C525
2.2u 0.1u
R534 10
R519 10
PROX_ADC
C526
3300p
PROX_ADC output
0.2 ~ 2.6 V
PROX_LEDON signal output
17.5 kHz
DOUT disable
LGE Internal Use Only