Keypad Led Not In Operation (3-Color And Blue) - Pantech G310 Service Manual

G310 Service Manual

6.1.3 KEYPAD LED Not in Operation (3-color and blue)

1. Check to see if R421 and 422.1 are around 2.8V (duty: 80%, 256Hz) : CP110
NO Check R421, 422, Q401, 402, 403 and 404, and then replace those.
2. Check to see if R401 ~ R410 are same with battery voltage : CP111
NO Check the PCB pattern between battery and the resistors.
NO Replace the resistors.
3. Check to see if D401 ~ 414 are well operated by multimeter : CP112
NO Replace the LEDs.
CP110
CP111
31
PANTECH
CP112
R&D CONFIDENTIAL