Sony Ericsson K770 User manual

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/142 A
Company Internal
© Sony Ericsson Mobile Communications AB
1(32)
Trouble Shooting Guide, Mechanical
Applicable for K770
Contents
1
General ...............................................................................................................2
1.1 Service functions in the software...........................................................2
1.2 Misuse and other no warranty issues ....................................................3
2 Appearance Problems.......................................................................................7
3 Network/Signal Problems .................................................................................9
4 On/Off Problems ..............................................................................................12
5 Audio Problems ...............................................................................................14
6 Key Problems...................................................................................................18
7 Display Problems ............................................................................................21
8 Illumination Problems .....................................................................................22
9 Alert Problems .................................................................................................24
10 SIM Problems...................................................................................................26
11 Charging/Capacity Problems .........................................................................27
12 Camera Problems ............................................................................................29
13 Media Memory Problems ................................................................................30
14 Software Problems ..........................................................................................31
15 Revision History ..............................................................................................32

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/142 A
Company Internal
© Sony Ericsson Mobile Communications AB
2(32)
1General
This document outlines the mechanical repairs that should be made in an attempt to fix the common failures that are seen in the
field. To gain a complete understanding of how to test and repair a specific failure, this document should be used in conjunction
with the Test Instructions, Mechanical and the Working Instructions, Mechanical.
1.1Service functions in the software
The service menu will be accessed with the following key combination.
⇒*⇐⇐*⇐*
They are as follows:
Service info
Service tests
Text labels
The phones software has a built in service functionality that allows you to test some of the phones functions. (See point 2 above) It
looks like this:
Main display
LED/illumination
Keyboard
Speaker
Earphone
Microphone
Vibrator
Camera
Real time clock
Total call time
NOTE: Different names may occur depending on language setting and customization.

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/142 A
Company Internal
© Sony Ericsson Mobile Communications AB
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1.2Misuse and other no warranty issues
Misuse is not covered by warranty. This chapter will explain what’s not covered by warranty. Phones that have been exposed to
misuse will not be covered by warranty.
This means: if it is possible to repair the phone, the customer will have to pay for the repair. SEMC will not allow any of these
phones to be claimed into WCMS. Some local perspectives may interfere with this. Please reference to local directives.
1.2.1 Action
Make a general visual inspection for misuse.
Below are some examples of what is not covered by warranty.
Front window broken
due to misuse.
LCD cracked due to
drop.
Clear scratches Mark after drop Corrosion components
on the PCB.

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/142 A
Company Internal
© Sony Ericsson Mobile Communications AB
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Corrosion components on
the PCB.
Corrosion components on the
PCB.
SIM reader damaged by
liquid.
System connector damaged by
liquid
Components around system
connector damaged by liquid
System connector pad(s)
damaged by liquid

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/142 A
Company Internal
© Sony Ericsson Mobile Communications AB
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1.2.2 Liquid damage sticker
In the phone there is placed a sticker that can give you a hint to see if the phone is damage by liquid or not. This sticker is located
near the Antenna box (Fig. 1.2.1) and it is possible to see it without disassemble the phone.
Fig. 1.2.1
On the pictures below you will see the different between a sticker that has been in contact with liquid (Fig. 1.2.3) and with one that
hasn’t (Fig. 1.2.2).
This sticker is ok This sticker is not ok
The white sticker that has been in
contact with liquid turns into a red or
pink sticker. In this case you should
check the phone for liquid damage
(See point 1.1.1) .
Note: There must be clear marks after
liquid on the PCB before rejecting the
phone for repair.
Fig. 1.2.2 Fig. 1.2.3