Sony Ericsson G900 User manual

Trouble Shooting Guide, Mechanical
1210-5425 Rev1
Company Internal ©Sony Ericsson Mobile Communications AB
Trouble Shooting Guide, Mechanical
Applicable for G900
Contents
1General.................................................................................................................................................2
1.1 Service functions in the software ....................................................................................... 2
1.2 Misuse and other no warranty issues.................................................................................3
2Network/Signal Problems.....................................................................................................................8
3Audio Problems....................................................................................................................................9
Microphone:..................................................................................................................................9
Receiver:....................................................................................................................................10
Rear Speaker:............................................................................................................................12
4Key Problems.....................................................................................................................................13
Keyboard:...................................................................................................................................13
Numeric Keyboard:.....................................................................................................................14
Volume key:................................................................................................................................15
Power Key:.................................................................................................................................16
Hold Key:....................................................................................................................................17
Volume key:................................................................................................................................18
Touch screen:.............................................................................................................................19
5Display Problems ...............................................................................................................................20
6Illumination Problems.........................................................................................................................22
Keyboard Illumination:................................................................................................................22
Display Illumination: ...................................................................................................................22
7Alert Problems....................................................................................................................................23
Rear speaker:.............................................................................................................................23
8Charging/Capacity Problems..............................................................................................................24
9Rear Camera Problems......................................................................................................................25
10 Video Call Camera Problems.............................................................................................................27
11 Flash Problems...................................................................................................................................28
12 SIM Problems.....................................................................................................................................29
13 Data Transfer Problems using a Data Cable .....................................................................................30
14 Bluetooth and WLAN Problems..........................................................................................................31
15 Hands-Free Problems........................................................................................................................32
16 Revision History..................................................................................................................................33

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 2(33)
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.
Company Internal ©Sony Ericsson Mobile Communications AB
1.1 Service functions in the software
The service menu will be accessed with the following key combination. Use the joystick.
⇒*⇐⇐*⇐*
They are as follows:
Service information
Service tests
Format internal disk
Under the “Service tests” option, the phone’s software has a built in service functionality that allows you to test some of the phones
functions. It looks like this:
Display
Camera
Touch screen
Illumination
LED’s
Keyboard
Vibrator
Speaker’s
Microphone
FM Radio
MemoryStick
NOTE: Different names may occur depending on language setting and customization.

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 3(33)
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. LCD cracked due to drop. Clear scratches Mark after drop Corrosion components on
the PCB.
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Trouble Shooting Guide, Mechanical
1210-5425 Rev1 4(33)
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
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Trouble Shooting Guide, Mechanical
1210-5425 Rev1 5(33)
1.2.2 Liquid damage sticker
On the pictures below you will see the different between a sticker that has been in contact with liquid (Fig. 1.2.2) and with one that
hasn’t (Fig. 1.2.1).
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.
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.
1.2.4 Gaskets
Any gaskets that are damaged before or during repair should be replaced.
Note: There must be clear marks after liquid
on the PCB before rejecting the phone for
repair.
Fig. 1.2.1 Fig. 1.2.2
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Trouble Shooting Guide, Mechanical
1210-5425 Rev1 6(33)
Power Problems
Problem Area Items to Inspect Repair Action Inspection Reference
Check whether the keyboard
illuminates 15 to 20 seconds after
pressing the power key
If illumination of the keyboard is detected,
refer to the “Display Problems” section
Inspect battery connector •If dirty or oxidized – Clean
•If damaged – Send to an electrical
repair location
Unit will not
Power On
Inspect whether the Flash Flex foil
assembly is properly connected to
the circuit board
•If improperly connected - Reestablish
proper connection
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Trouble Shooting Guide, Mechanical
1210-5425 Rev1 7(33)
Problem Area Repair Action
Items to Inspect Inspection Reference
Inspect the power key and the Flash
Flex Foil •Make sure the power key is properly
positioned in the frame.
•If dirt or debris is detected – Clean
both the key and the switch
•If the key is damaged – Replace it
•If the Flash Flex is damaged –
Replace it
Note: New Flash Flex Require
calibration with ITP in SL4 centre
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 8(33)
2 Network/Signal Problems
Problem Area Items to Inspect Repair Action Inspection Reference
Inspect SIM holder •If dirty or oxidized – Clean
•If damaged – replace the PCB Sub
Asm
If the issue has not been resolvedƕClean the antenna-to-board
connectors on the circuit board and
replace the antenna flex
No Signal or Poor
Signal
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 9(33)
3 Audio Problems
Problem Area Items to Inspect Repair Action Inspection Reference
Before proceeding Æ•Perform a setting reset
Inspect the microphone’s external
port
•If clogged - Clean microphone gasket
mounted on carrier inside.
•If damaged. Replace it
Visually inspect the microphone
net
•If improperly mounted - Secure
properly connection
•If damaged. Replace it
Microphone:
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 10(33)
Problem Area Repair Action
Items to Inspect Inspection Reference
Before proceeding Æ•Perform a setting reset
Receiver:
No sound or poor
quality sound Check if the receiver’s external ports
are clogged •If clogged – Clean the external ports
in the front cover complete or replace
the front assy
•If clogged – Clean the net on the ear
speaker complete or replace the ear
speaker as determined necessary
Inspect whether the Flash Flex foil
assembly is properly connected to
the circuit board
•If improperly connected - Reestablish
proper connection
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
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Problem Area Repair Action
Items to Inspect Inspection Reference
If the issue has not been resolvedÆ•Clean the receiver’s contact pads
on the Flash Flex and replace
receiver
•Change the ear speaker
•Change the Flash Flex
Note: New Flash Flex Require
calibration with ITP in SL4
centre
Receiver:
No sound or poor
quality sound
(Cont.)
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 12(33)
Problem Area Items to Inspect Repair Action Inspection Reference
Before proceeding Æ•Perform a setting reset
Inspect whether the battery covers
external ports and Loud speaker
gasket are clogged
•If clogged – Clean out the battery
covers external ports and replace the
loudspeaker gasket
•
If the issue has not been resolvedÆ
•Check if Pogo pins are corroded or
dirty, Clean the pins if necessary
•Clean the rear speaker’s contact
pads on the circuit board.
•Replace the Speaker Box
Rear Speaker:
No sound or poor
quality sound
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 13(33)
4 Key Problems
Problem Area Items to Inspect Repair Action Inspection Reference
Inspect whether the keyfoil assembly
is properly connected to the circuit
board
•If improperly connected -
Reestablish proper connection
Inspect each half of the keyfoil to
circuit board connection •If dirty or oxidized – Clean both
halves of the connection
•If the portion of the connection on
the key foil complete is damaged -
Replace the key foil complete
•If the portion of the connection on
the circuit board is damaged – Send
to an electrical repair location
If the issue has not been resolved Æ•Replace the key foil complete, if it
has not already been replaced
Keyboard:
None of the keys
on the keyboard
are functioning
(excluding the
navigation key)
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
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Problem Area Repair Action
Items to Inspect Inspection Reference
Inspect for debris between and/or
damage to the numeric keyboard
and the corresponding portion of the
keyfoil assembly.
•If debris is found – Clean both parts
•If damage is seen – Replace the
numeric keyboard and/or the key foil
complete as necessary
If the issue has not been resolved Æ•Replace the numeric keyboard and
the key foil complete, if they have not
already been replaced
Numeric
Keyboard:
A key on the
numeric keyboard
is not functioning
or is intermittent
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 15(33)
Problem Area Repair Action
Items to Inspect Inspection Reference
Inspect the portion of the volume key
that is not functioning and its
corresponding switch.
•Make sure the volume flex is
properly positioned in the PCB
assembly.
•If the switch is damaged – Change
the Flex Foil
•Make sure the volume key is
properly positioned in the frame
assembly.
•If dirt or debris is detected – Clean
the volume key and both switches
•If the key is damaged – Replace it
Volume key:
A direction of the
key is not
functioning or is
intermittent
If the issue has not been resolved Æ•Escalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 16(33)
Problem Area Repair Action
Items to Inspect Inspection Reference
Inspect the power key and the power
key’s switch •Make sure the power key is properly
positioned in the phone.
•If dirt or debris is detected – Clean
both the key and the switch
•If the key is damaged – Replace it
•If improperly connected -
Reestablish proper connection
Inspect whether the Flash Flex foil
assembly is properly connected to
the circuit board
•If the switch is damaged – Change
the Flash Flex
Note: New Flash Flex Require
calibration with ITP in SL4 centre
Power Key:
If the issue has not been resolved Æ•Escalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 17(33)
Repair Action
Items to Inspect Inspection Reference
Problem Area
Inspect the camera key and its
switch •Make sure the hold key is properly
positioned in the front cover.
•Make sure the hold switch is properly
positioned in the Frame assy.
•If dirt or debris is detected – Clean
both the hold key and its switch
•If the hold key is damaged – Replace
it
•If the hold key portion of the dome
foil assembly is damaged, replace
the dome foil assembly
Hold Key:
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 18(33)
Problem Area
Items to Inspect
Repair Action
Inspection Reference
Inspect the portion of the volume key
that is not functioning and its
corresponding switch.
•Make sure the volume flex is
properly positioned in the PCB
assembly.
•If the switch is damaged – Change
the Flex Foil
•Make sure the volume key is
properly positioned in the frame
assembly.
•If dirt or debris is detected – Clean
the volume key and both switches
•If the key is damaged – Replace it
Volume key:
A direction of the
key is not
functioning or is
intermittent
Company Internal ©Sony Ericsson Mobile Communications AB
If the issue has not been resolved Æ•Escalate to an electrical repair level

Trouble Shooting Guide, Mechanical
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Inspect the Touch screen contact pin
on the circuit board. •Clean the Touch screen contact pin
on the circuit board.
•Clean the Touch screen contact pad
on the Front Asm
Touch screen:
If the issue has not been resolved Æ•Replace the Front Asm
If the issue is still not resolvedƕEscalate to an electrical repair level
Company Internal ©Sony Ericsson Mobile Communications AB

Trouble Shooting Guide, Mechanical
1210-5425 Rev1 20(33)
5 Display Problems
Problem Area Repair Action Inspection ReferenceItems to Inspect
•If the keyboard does not illuminate,
refer to the “Power Problems” section
Check whether the keyboard
illuminates 15 to 20 seconds after
pressing the power key
If a display is not
functioning
Inspect whether the LCD assembly’s
flex film is properly connected to the
circuit board
•If improperly connected - Reestablish
proper connection
Inspect each half of the LCD to
circuit board connection •If dirty or oxidized – Clean both
halves of the connection
•If the portion of the connector on the
LCD is damaged - Replace the LCD
•If the portion of the connector on the
circuit board is damaged – Escalate
to an electrical repair level
If the issue has not been resolved Æ•Replace the LCD if it has not been
replaced
If the issue is still not resolved Æ•Escalate to an electrical repair level
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