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
© NMP 2003
Checked by:
SCCE Training Group
Approved by:
SCCE
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!
µBGA
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
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