Ui Troubleshooting; Introduction; Ui Module Troubleshooting Cases; Display Blank - Nokia NHL-2NA Series Troubleshooting Instructions

CCS Technical Documentation

UI Troubleshooting

Introduction

UI module includes LCD display and backlight, four keydomes and a 5-way switch also
known as rocker. This document describes it's troubleshooting.
The LCD displays may have bright pixels or dark pixels that are visible with some colors.
These are characteristic to active matrix LCD's and do not cause a change of UI module.
Each UI module has a different contrast point. That point can vary more than the end
user has possibility to adjust. Therefore every time you change the UI module, you need
to adjust the contrast point.

UI module troubleshooting cases

Display blank

There is no image on the display. Display looks the same when the phone is on as it does
when the phone is off.
Display blank
Put the phone on
MJF-7, FLA-21 or
MJS-9Q
Do baseband self
test and ADC with
Phoenix
Fail
Go to BB
troubleshooting
Issue 1 07/02
Change contrast and
OK
insert picture with
display test
Fail
Check UI
connector, both
male and female
OK
Check EMI
filter visually
OK
Check UPP
WD2
OK
Change UI
module and retest
¤Nokia Corporation
Problem solved
OK
Reflash and
OK
retest
Fail
Beyond
economical repair
Repair connector
Faulty
and retest
Change EMI filter
Faulty
and retest
Change UPP and
Faulty
retest
NHL-2NA
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