Keypad Backlight Trouble - LG -S310 Service Manual

4.7 Keypad Backlight Trouble

MAIN Key Pad LED is on as below :
Key pressing -> main key backlight goes down low (below 0.8v) -> MAIN Key Backlight LED On
Check the TP1 voltage
-TP1 = Above 0.8 V
MAIN_KEY_BACKLIGHT
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Only for training and service purposes
VBAT
R100 R101
C101
100 100
1u
LD100 LD101 LD102 LD103 LD104 LD105
TP1
VA100
Figure 4.7.1 Keypad Backlight Trouble Circuit
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4. TROUBLE SHOOTING
R102 R103
R104 R105
100 100
100 100
R106 R107
100 100
LD106 LD107
LGE Internal Use Only