Sony-Ericsson W850 Service Manual Trouble Shooting

Trouble Shooting Guide, Mechanical

Applicable for W850

Contents

General ...............................................................................................................2

1

1.1 Service functions in the software...........................................................2

1.2 Misuse and other no warranty issues ....................................................3

2 Appearance Problems....................................................................................... 6

3 Network/Signal Problems .................................................................................8

4 On/Off Problems ..............................................................................................11

5 Audio Problems ...............................................................................................13

6 Key Problems................................................................................................... 18

7 Slider Problems ...............................................................................................24

8 Display Problems ............................................................................................25

9 Illumination 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

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Trouble Shooting Guide, Mechanical

1 General

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.

1.1 Service 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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1.2 Misuse 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.

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LCD cracked due to

drop.

Clear scratches Mark after drop Corrosion components

on the PCB.

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Corrosion components on

Corrosion components on the

the PCB.

Components around system

connector 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.

PCB.

SIM reader damaged by

liquid.

System connector pad(s)

damaged by liquid

System connector damaged by

liquid

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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).

This sticker is ok This sticker is not

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.

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ok

Fig. 1.2.2 Fig. 1.2.3

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.

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2 Appearance Problems

Problem Area Items to Check Repair Action Reference Image

Appearance

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

Visually inspect for improper gap between seams

• 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

• Reassemble or replace damaged parts as necessary.

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Problem Area Items to Check Repair Action Reference Image

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3 Network/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.

No Signal or Poor Signal

Visually inspect SIM holder

Visually inspect antenna contact pads and the antenna connector.

• If dirty or oxidized – Clean it

• If damaged – Send to electrical repair.

• 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.

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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

No signal when using external antenna (ex. Hands free in car).

Connect the phone to a handsfree car kit connected with external antenna.

Visually inspect the antenna bar on the phone.

If the issue has not been resolved !

• 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.

• Handle the unit according to local directives.

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4 On/Off Problems

Problem Area Items to Check Repair Action Reference Image

Power On problems

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 !

Cannot be power on, Cannot be detected on USB cable on EMMA III.

Visually inspect contact pads on battery

• 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.

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.

• 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

Visually inspect the power key

• If dirty or oxidized – Clean it.

Note: Take care not to bend the connector pin’s

• If damaged – Send to an electrical repair location.

• If damaged – Replace on/off key.

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If the issue has not been resolved !

• Handle the unit according to local directives.

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5 Audio Problems

Problem Area Items to Check Repair Action Reference Image

Microphone:

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 the issue has not been resolved !

• 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

• Replace microphone and microphone grommet.

• Handle the unit according to local directives.

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Problem Area Items to Check Repair Action Reference Image

Receiver

(earphone):

No sound or poor quality sound

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

Visually inspect whether the main flex film is properly connected to its connector on the navigation key foil assy

• If clogged – Clean or replace front.

• 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.

Main flex connector

If the issue has not been resolved !

• If BtB connector on the PCB is damaged - Send to electrical repair.

• Replace receiver

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.

Loudspeaker:

No sound or poor quality sound

Before proceeding !

Visually inspect loudspeaker’s external port

If the issue has not been resolved !

• 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.

• If clogged – Clean it.

• 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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6 Key Problems

Problem Area

Keyboard Numeric:

A key on the main keyboard (1.2.3…) is not functioning or is intermittent

Items to Check

Visually inspect for debris between keypad and numeric key foil assy, and for damage to the keypad and the numeric key foil assy.

If the issue has not been resolved !

Repair Action

• If damaged - Replace keypad and/or key foil assy as necessary.

• Replace keypad numeric and/or key foil assy, if it has not already been replaced.

• Handle the unit according to local directives.

Reference Image

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Problem Area

Keyboard

Navigation:

A key on the sub

Items to Check

Visually inspect for debris between keypad and navigation key foil assy, and for damage to the keypad and the navigation key foil assy.

Repair Action

• If damaged - Replace keypad and/or navigation key foil assy as necessary.

keyboard (navi keys) is not functioning or is intermittent

Reference Image

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Problem Area

Items to Check

Visually inspect whether the main flex film is properly connected to its connector on both PCB’s

Repair Action

• 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.

Reference Image

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Problem Area

Items to Check

If the issue has not been resolved !

Repair Action

• Replace keypad, key foil assy and/or navigation key foil assy, if it has not already been replaced.

Reference Image

Main flex connector

Half to half flex connector

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If the issue has not been resolved !

• Handle the unit according to local directives.

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Problem Area

A & B keys

Items to Check

Visually inspect whether the main flex film is properly connected to its connector on the navigation key foil assy

Repair Action

• If improperly connected – Re-establish proper connection.

• If main flex is damage – replace it.

Reference Image

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Problem Area

Items to Check

Visually inspect whether the half to half flex film is properly connected to its connector on the navigation key foil assy and the PCB

Repair Action

• If improperly connected – Re-establish proper connection.

• If half to half flex is damage – Replace it.

• If any of the BtB connector on the navigation key foil assy are damaged – Replace navigation key foil assy.

• If BtB connector on the PCB is damaged - Send to electrical repair.

Reference Image

Main flex connector

Half to half flex connector

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If the issue has not been resolved !

• Handle the unit according to local directives.

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7 Slider Problems

Problem Area

Slider

The slider can not open or close

Items to Check

Inspect whether the slider open and close properly

If the display do not change when open or close

Repair Action

• If there are any problems – replace the slider

•

• If damaged – Replace it

Reference Image

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If the issue has not been resolved !

• Handle the unit according to local directives.

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8 Display Problems

Problem Area

Items to Check

Check whether the phone vibrates 10 to 15 seconds after pressing the power key and whether the keypad illuminates

Before proceeding !

Repair Action

• If activation of the vibrator are not detected, refer to the On/Off

Problems” chapter 4

• 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.

Reference Image

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Trouble Shooting Guide, Mechanical

Problem Area

Display

Items to Check

Visually inspect whether the LCD flex film is properly connected to its connector on the navigation keyfoil assy

Repair Action

• If improperly connected – Re-establish proper connection.

• If damage – Replace navigation keyfoil assy or display as necessary.

Reference Image

LCD connecto

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Problem Area

Items to Check

Visually inspect whether the half to half flex film is properly connected to its connector on both PCB’s

Repair Action

• If improperly connected – Re-establish proper connection.

• If half to half flex is damage – replace it.

Reference Image

• If Half to half BtB connector is damaged – Replace navigation keyfoil assy.

Half to half flex connector

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Problem Area

Items to Check

If the issue has not been resolved !

Repair Action

• Replace the main LCD.

NOTE: Misuse is not covered by warranty. Refer to chapter 1.2

If the issue has not been resolved !

• Handle the unit according to local directives.

Reference Image

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9 Illumination Problems

Problem Area

Before proceeding !

LCD illumination

Key numeric illumination:

Key navigation illumination:

Items to Check

Refer to “Display” section under “Display Problems”

Refer to “Keyboard numeric ” section under “Key Problems”

Refer to “Keyboard navigation ” section under “Key Problems”

Repair Action

• 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.

Reference Image

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10 Alert Problems

Problem Area

Vibrator:

Items to Check

Before proceeding !

Visually inspect the vibrator pads on the PCB

Visually inspect the vibrator

Repair Action

• 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.

• If dirty or oxidized – Clean them.

• If dirty or oxidized – Replace it.

• If damaged – Replace it.

Reference Image

Loudspeaker

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Refer to “loudspeaker” section under “Audio Problems”

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11 SIM Problems

Problem Area

SIM undetected (Insert SIM)

Unit indicates an incorrect SIM is inserted (Insert correct SIM)

Items to Check

Visually inspect SIM holder

Check whether the phone is locked to a particular carrier and whether the correct carrier’s SIM is being used

If the issue has not been resolved !

Repair Action

• If dirty, oxidized or damaged – Replace it.

• Use Correct Carrier SIM or test SIM.

• Handle the unit according to local

directives.

Reference Image

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12 Charging/Capacity Problems

Problem Area

Battery will not charge

Items to Check

Visually inspect the contact pads of the battery

Visually inspect the battery connector

Visually inspect the system connector

Repair Action

• If dirty or oxidized – Clean.

• If damaged – Replace battery.

• If dirty or oxidized – Clean.

• If damaged – Send to an electrical

repair location.

• If dirty or oxidized – Clean

Reference Image

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• If damaged – replace it.

Note: Remember to put back the dust gasket system connector before the system connector

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If the issue has not been resolved !

• Handle the unit according to local directives.

Battery looses charge quickly/ standby time seems short

Before proceeding !

Note: Some features noticeably reduce the amount of standby time if they are turned on. Some examples are the back light (when on all the time), Bluetooth and infrared.

If the issue has not been resolved !

• 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.

• Replace battery.

• Handle the unit according to local

directives.

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13 Camera Problems

Problem Area Items to Check Repair Action Reference Image

Camera rear

(Mega pixels)

Lines, marks, blurred or discolored picture/ Will not enter camera menu

Visually inspect the camera lens

Visually inspect whether the camera is properly connected to its socket on the PCB.

• If scratched or damaged – Replace upper case rear.

• If improperly connected – Re-establish proper connection.

• If camera socket is damaged – Send to electrical repair.

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Problem Area Items to Check Repair Action Reference Image

If the issue has not been resolved !

• Replace the camera rear.

Note: Remember to put back the camera rubber when replacing the camera.

Will not capture an image

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If the issue has not been resolved !

Visually inspect for damage to the camera keys

• Handle the unit according to local directives.

• If damaged – Replace them.

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Problem Area Items to Check Repair Action Reference Image

Visually inspect whether the camera is properly connected to its socket on the PCB.

If the issue has not been resolved !

• If improperly connected – Re-establish proper connection.

• If camera socket is damaged – Send to electrical repair

• Replace camera rear.

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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

Camera Front

(Video call camera)

Visually inspect the camera lens

Visually inspect whether the video call camera flex film is properly connected to its connector on the main flex film.

• If dirty – Clean camera lens.

• If scratched or damaged – Replace

sheet (Screw) Upper.

• If improperly connected – Re-establish proper connection.

• If damage – Replace navigation key foil assy or video call camera as necessary.

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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 both PCB’s

• If improperly connected – Re-establish proper connection.

• If half to half flex is damage – Replace it.

Main flex connector

• If any of the BtB connectors on the navigation key foil assy are damaged – Replace navigation key foil assy.

• If main BtB connector on the PCB is damaged – Send to electrical repair

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 !

• Replace the camera front.

• Replace the main flex film, navigation

key foil assy and the video call camera if not always replaced.

LED flash

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Visually inspect the flash LED

• If no flash light – Replace LED- flash module

Note: Remember to put back the flash reflector when replacing flash LED.

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14 Data Communication Problems

Problem Area Items to Check Repair Action Reference Image

Will not connect with a functional Bluetooth device

Visually inspect the system connector pads for dirt.

If the issue has not been resolved !

• If dirty – Clean it.

• Replace the BT antenna

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If the issue has not been resolved !

• Handle the unit according to local directives.

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15 Software Problems

• If there are problems with the response of the keypad commands, spelling errors in the menu or the phone hang, if they are not related to mechanical damage, make a master reset and flash the phone with the latest software from EMMA III.

• Checking the software revision can be done in the Service info, see chapter Service functions in the software. Choose: Service info / SW information. The Software revision and date will be shown in the display.

Note: Do Software Update Content Refresh before sending the unit to a higher level. Do not scrap a phone that hasn’t been

upgraded with Software Update Content Refresh.

If the failure still occurs, handle the unit according to the local directives.

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16 Revision History

Rev. Date Changes / Comments

A 2006-09-20 Initial release

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