Nokia 8390 Manuales De Servicio

NSB-8

Troubleshooting Instructions

PAMS Technical Documentation

Page 34

 

ãNokia Corporation

Issue 1 01/02

X303 PIN 2: KEYB_LIGHT, BACKLIGHT CIRCUITRY (V300 pin 6) -> UI CONNECTOR (X303 pin 2)

The following hints should help to find the cause of the problem when the circuitry 
seems to be faulty. This trouble shooting instruction is divided into sections.

1 Phone is totally dead

2 Power does not stay on or the phone is jammed

3 Flash programming does not work

4 Display is not working

5 Plug in SIM card is out of order (insert SIM card).

6 Audio fault

7 Charging fault

The first thing to do is carry out a through visual check of the module. Ensure in particu-
lar that:

a) there are no mechanical damages

b) soldered joints are OK.