Sony Ericsson W850 User manual

Trouble Shooting Guide, Mechanical
4/000 21-1/FEA 209 544/104 A
Company Internal ©Sony Ericsson Mobile Communications AB
Trouble Shooting Guide, Mechanical
Applicable for W850
Contents
1General ...............................................................................................................2
1.1 Service functions in the software...........................................................2
1.2 Misuse and other no warranty issues ....................................................3
2Appearance Problems.......................................................................................6
3Network/Signal Problems .................................................................................8
4On/Off Problems ..............................................................................................11
5Audio Problems ...............................................................................................13
6Key Problems...................................................................................................18
7Slider Problems ...............................................................................................24
8Display Problems ............................................................................................25
9Illumination Problems .....................................................................................29
10 Alert Problems .................................................................................................30
11 SIM Problems...................................................................................................31
12 Charging/Capacity Problems .........................................................................32
13 Camera Problems ............................................................................................34
14 Data Communication Problems .....................................................................40
15 Software Problems ..........................................................................................41
16 Revision History ..............................................................................................42

Trouble Shooting Guide, Mechanical
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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. Use the navigation keys ⇒*⇐⇐*⇐*
They are as follows:
Service info
Service settings
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
Flash LED
Video call camera
Memory Stick
FM Radio
Real time clock
Total call time
NOTE: Different names will occur depending on language setting and customization.

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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.

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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
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 SIM reader (Fig. 1.2.1) and it is possible to see it without disassemble the phone.

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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).
1.2.3 Action
Make a general visual inspection for misuse, corrosion or oxidation from liquid damage. No further action should be taken for a liquid
damaged phone. Handle the unit according to local directives.
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

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2Appearance Problems
Problem Area Items to Check Repair Action Reference Image
Visually inspect the cosmetic quality of
all user viewable surfaces
•If dirty – Clean parts as necessary.
•If unacceptably scratched or damaged
– Replace damage parts as necessary.
NOTE: Misuse is not covered by
warranty. Refer to chapter 1.2
Visually inspect all keys •If dirty – Clean parts as necessary.
•If unacceptably scratched or damaged
– Replace damaged parts as
necessary.
NOTE: Misuse is not covered by
warranty. Refer to chapter 1.2
Appearance
Visually inspect for improper gap
between seams
•Reassemble or replace damaged parts
as necessary.

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Problem Area Items to Check Repair Action Reference Image

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3Network/Signal Problems
Problem Area Items to Check Repair Action Reference Image
Before proceeding !•Do software update content refresh.
Note: this problem will not be solved be
a regular software update.
Note: Software Update Content Refresh
will erase all user data.
Visually inspect SIM holder •If dirty or oxidized – Clean it
•If damaged – Send to electrical repair.
No Signal or Poor
Signal
Visually inspect antenna contact pads
and the antenna connector.
•If dirty or oxidized – Clean the pads
and replace the antenna assembly.
Note: Do not bend the antenna
connector.

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Problem Area Items to Check Repair Action Reference Image
Visually inspect antenna •If dirty, oxidized or damaged – Replace
it.
If the issue has not been resolved !•Handle the unit according to local
directives.

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Problem Area Items to Check Repair Action Reference Image
Connect the phone to a handsfree car
kit connected with external antenna.
Visually inspect the antenna bar on the
phone.
•If no or only very less signal – Push
the middle pin of the ext. antenna
connector a few times
Note: Take care not to scratch the gold
surface.
No signal when
using external
antenna (ex. Hands
free in car).
If the issue has not been resolved !•Handle the unit according to local
directives.

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4On/Off Problems
Problem Area Items to Check Repair Action Reference Image
Check whether the phone vibrates 10 to
15 seconds after pressing the power
key and whether the keypad illuminates
•If activation of the vibrator or keypad
are detected, refer to the “Display
Problems” chapter 7
Before proceeding !•Do software update content refresh.
Note: this problem will not be solved be
a regular software update.
Note: Software Update Content Refresh
will erase all user data.
Cannot be power on,
Cannot be detected on USB cable on
EMMA III.
1. Log on to EMMA as usual.
2. Use SEPI A1 with power charger
attached.
3. Press keys 2 and 5 when you connect
the phone.
Power On
problems
Visually inspect contact pads on battery •If dirty or oxidized – Clean pads.
•If damaged – Replace the battery.

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Problem Area Items to Check Repair Action Reference Image
Visually inspect battery connector •If dirty or oxidized – Clean it.
Note: Take care not to bend the
connector pin’s
•If damaged – Send to an electrical
repair location.
Visually inspect the power key •If damaged – Replace on/off key.
If the issue has not been resolved !•Handle the unit according to local
directives.

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5Audio Problems
Problem Area Items to Check Repair Action Reference Image
Before proceeding !•Do software update content refresh.
Note: this problem will not be solved be
a regular software update.
Note: Software Update Content Refresh
will erase all user data.
Visually inspect the microphone’s
external port
•If clogged – Clean.
Note: It can easily happen that the
customer blocks the microphone port
with there hand. If no fault found.
Please inform the customer where the
port is and that it is important not to
cover it during calls
If the issue has not been resolved !•Replace microphone and microphone
grommet.
Microphone:
If the issue has not been resolved !•Handle the unit according to local
directives.

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Problem Area Items to Check Repair Action Reference Image
Before proceeding !•Do software update content refresh.
Note: this problem will not be solved be
a regular software update.
Note: Software Update Content Refresh
will erase all user data.
Visually inspect receiver’s external port •If clogged – Clean or replace front.
Receiver
(earphone):
No sound or poor
quality sound
Visually inspect whether the main flex
film is properly connected to its
connector on the navigation key foil
assy
•If improperly connected – Re-establish
proper connection.
•If main flex is damage – replace it.

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Problem Area Items to Check Repair Action Reference Image
Visually inspect whether the half to half
flex film is properly connected to its
connector on the navigation key foil
assy and the PCB
•If improperly connected – Re-establish
proper connection.
•If half to half flex is damage – Replace
it.
•If BtB connector on the PCB is
damaged - Send to electrical repair.
If the issue has not been resolved !•Replace receiver
Main flex connecto
r
Half to half flex connector

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Problem Area Items to Check Repair Action Reference Image
If the issue has not been resolved !•Handle the unit according to local
directives.
Before proceeding !•Do software update content refresh.
Note: this problem will not be solved be
a regular software update.
Note: Software Update Content Refresh
will erase all user data.
Visually inspect loudspeaker’s external
port
•If clogged – Clean it.
Loudspeaker:
No sound or poor
quality sound
If the issue has not been resolved !•Replace loudspeaker box.

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Problem Area Items to Check Repair Action Reference Image
If the issue has not been resolved !•Handle the unit according to local
directives.

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6Key Problems
Problem Area Items to Check Repair Action Reference Image
Visually inspect for debris between
keypad and numeric key foil assy, and
for damage to the keypad and the
numeric key foil assy.
•If damaged - Replace keypad and/or
key foil assy as necessary.
If the issue has not been resolved !•Replace keypad numeric and/or key
foil assy, if it has not already been
replaced.
Keyboard
Numeric:
A key on the main
keyboard (1.2.3…)
is not functioning or
is intermittent
If the issue has not been resolved !•Handle the unit according to local
directives.

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Problem Area Items to Check Repair Action Reference Image
Keyboard
Navigation:
A key on the sub
keyboard (navi
keys) is not
functioning or is
intermittent
Visually inspect for debris between
keypad and navigation key foil assy,
and for damage to the keypad and the
navigation key foil assy.
•If damaged - Replace keypad and/or
navigation key foil assy as necessary.

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Problem Area Items to Check Repair Action Reference Image
Visually inspect whether the main flex
film is properly connected to its
connector on both PCB’s
•If improperly connected – Re-establish
proper connection.
•If main flex is damage – Replace it.
•If any of the BtB connector on the
navigation key foil assy are damaged –
Replace navigation key foil assy.