User Guide

NSB-5

Troubleshooting Instructions PAMS Technical Documentation

Page 6 Nokia Mobile Phones Ltd. Issue 1 03/01

Figure 1: Fault Finding for Totally Dead Phone

Flash Programming Doesn’t Work

The flash programming can be done via panel connector X201 or via system connector

X200.

In production, the first programming is done via panel connector X201. After this, the

panel connector is cut away, thus other flash programming must be done via system

connector X200.

Phone is totally dead.

Measure voltage at N101

pin 5 (VBAT)

3.6V

Measure voltage at V103

pin 1

3.6V

Power doesn't stay on.

Yes

Failure in VBAT.

Check X101, X102, L710

Measure voltage at R413 (end

towards CCONT) when pwr-switch

(X400 pin 7) is pressed or

WDOGDISABLE (X201 pin 11) is

grounded.

(Will be low only during power-

up of CCONT if power switch is

pressed.)

Measure voltage at V109 pin 4 (Vbb)

2.8V

C112 (VXO) 2.8V

When PWR switch is pressed or

WDOGDISABLE is grounded.

Voltages OK?

Yes

Check R413, V410

Check LCD-module

Check WDOGDISABLE line

Yes

Faulty PCB