Nokia 8910, 8910i Service Manual

NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003

CONFIDENTIAL 1 (16)

Repair Hints

Service Level 3 & 4

8910/8910i

© NMP 2003

NHM-4/NHM-4NX

Checked by:
SCCE Training Group

Approved by:
SCCE

CONFIDENTIAL 2 (16)
NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003

General

-How to use this document

Put the colored schematics behind this manual.
Now you are able to follow these specifictions with graphical layouts and it is easier for you to find the components
and measuring points.

-General handling

Be very careful when disassembling the NHM-4/NHM-4NX while removing the grip module: Do not scratch it. Refer to
disassembling instructions in the service manual of NHM-4/NHM-4NX.
Both phones, 8910 and 8910i has the same typ (NHM-4NX) printed on the label.
Pay attention on the different sales names, when relabeling the phone

-Component charactaristics

Some components contain important data.
Several steps described are only feasible if you are able to reflash/ realign the phone and/ or rewrite IMEI/ SIMlock in
certain cases. Please pay attention to separate notes.

-Broken balls / underfill, µBGAs

All replaceable (not underfilled) µBGA components must be renewed after removing. Reflow with uncontrolled hot air
fan is strictly forbidden! It is also not recommended only to reflow the old µBGA using a µBGA rework station!
must only be soldered with NMP approved µBGA rework machines (e.g. Zevac / OK-Metcal / Martin) to get durable
soldering joints.
After removing a µBGA check soldering points, rework oxidated solderings (broken balls) carefully by tinplating these
areas with few flux and a hot soldering iron if necessary. Before placing a new component remove the tin and Use only
recommended flux type and an appropriate amount of it – avoid drowning the PWB in flux as this will result in
additional faults!
Also check underfilled parts for broken underfill material below. In this case carefully evaluate possible repair actions as
the phone probably was exposed to strong mechanical stress.

“Rework” done with uncontrolled hot-air PWB drowned in flux Oxidated solderings

.

µBGA

© NMP 2003

Checked by:
SCCE Training Group

Approved by:
SCCE

CONFIDENTIAL 3 (16)
NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003

-PCB handling & cleaning

To avoid damages of PWB and/ or components through electrostatic discharging, handle the module in
ESD-suitable cases only. When handling PWBs outside an ESD-bag always wear ESD-wristbands, which must be
connected to earth bonding point. Damage by electrostatic discharge often leads to a module not failing directly but in
a short period of time!
For cleaning only use appropriate materials, do not use scratching or rubbing tools. Useful tools for cleaning are flux
cleaners such as “Kontakt LR” or “Electrolube FLU” in connection with ionized compressed air.

-Screwing, torque

To assemble the phone, use a Torx T6 Plus screwdriver and torque of 17Ncm

-Realign after repair

Characteristics of replacement parts may vary.
To prevent additional faults after repair (e.g. low standby time, losing network etc.) it is necessary to retune phone
values after repair, but never try to cover up a fault by adjusting the phone.

-Fault report in fault log (Phoenix)

It is very important to report all repaired failures in fault log after finishing the complete phone repair.
The report content should only

contain the self-observed fault symptom, except “no fault found”.
In this case the report content should contain the symptom code that is given by the customer
e.g “Does not switch on”(2101) and the fault code“no fault found”(470).
If the symptom code from the customer is not identic to the observed symptom, always use the self-observed symptom
code.

.

© NMP 2003

Checked by:
SCCE Training Group

Approved by:
SCCE

NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003

CONFIDENTIAL 4 (16)

ESD PROTECTION REQUIREMENTS

Electrostatic discharge can easily damage the sensitive components
of electronic products. Therefore, every Service Partner has to take of
at least some precautions, such as ESD restricted area, floor, table,
covering, chair(s), shoes or wristbands.

For further information refer to the Partner Web site document

“Service Partner Requirements”

example of an electrostatic protected area (EPA) set-up

source: www.armeka.com

example of a workbench set-up

source: www.warmbier.com

example of a workbench and testers

source: http://www.armekaengineering.com

© NMP 2003

Checked by:
SCCE Training Group

Approved by:
SCCE

CONFIDENTIAL 5 (16)
NHM-4/NHM-4NX 8910/8910i Repairhints
Customer Care Europe, Middle East & Africa Version 2.0 Approved
SCCE Training Group Date 03.06.2003

IMPORTANT:

This document is intended for use by authorized NOKIA service centers only.

The purpose of this document is to provide some further service information for NHM-4/NHM-4NX 8910/8910i.
It contains a lot of collected tips and hints to find faults and repair solutions easily.
It also will give support to inexperienced technicians.
Saving process time and improving the repair quality is the aim of using this document.
It is based on fault symptoms (listed in "Contents"), followed by detailed description for further analysis.
It is to be used additionally to the service manual, and other service information such as Service Bulletins. For that
reason it does not contain any circuit or schematic diagrams.

All measurements are made using following equipment:

Nokia repair SW: Phoenix

Phoenix Application: A7 2003.9.7.8

Flash SW (CMT): 3.06 (NHM-4/8910)

3.01 (NHM-4NX/8910i)

Test Jig: MJS-39

Docking station: JBV-1

Docking Adapter: MJF-3

Digital Multimeter: Fluke 73

Oscilloscope: Fluke PM 3380A/B

Spectrum Analyzer: Advantest R3162 with an analogue probe

RF-Generator / GSM Tester: CMU 200

While every endeavour has been made to ensure the accuracy of this document, some errors may exist. If the reader
finds any errors, NOKIA should be notified in writing, using following procedure:

Please state:
Title of the document + issue number/date of publication.
page(s) and/or figure(s) of error.

Please send to: Nokia GmbH
Services & Competence Center Europe
Meesmannstr.103
D-44807 Bochum / Germany
Email: [e-mail]

Copyright © Nokia Mobile Phones.
This material, including documentation and any related computer programs, is protected by copyright, controlled by
Nokia Mobile Phones. All rights are reserved. Copying, including reproducing, modifying, storing, adapting or
translating any or all of this material requires the prior written consent of Nokia Mobile Phones. This material also
contains confidential information, which may not be disclosed to others without the prior written consent of Nokia
Mobile Phones.

© NMP 2003

Checked by:
SCCE Training Group

Approved by:
SCCE