Pantech PG-1810, Service Manual

Page: 30 / 54

PG-1810 Service Manual
PANTECH R&D CONFIDENTIAL
29
6.1.3 KEYPAD LED Not in Operation
1. Check to see if U121. 6 pin is around 2.8V : CP105
NO Check U201.
2. Check to see if U121. 3 pin or CC119 are around 3.3V : CP106
NO Check to see if U121. 1 pin is around : 3.5V ~ 4.2V .
NO Replace U121.
3. Check to see if D101~119 or around resistor are well operated by multimeter : CP107
NO Replace the LEDs or resistor.
CP105
CP106
CP107
CP105
CP106
CP107