Sony Ericsson K790 User manual

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
Trouble Shooting Guide, Electrical
Applicable for K790, K800
Contents
1General.............................................................................................................................2
2Repair Actions for Manual Test Failures .....................................................................3
2.1 Power On / Off .................................................................................................. 3
2.2 Software Flash...................................................................................................3
2.3 Charging ............................................................................................................3
2.4 Charging indicator (RED LED)......................................................................... 3
2.5 Hands-Free connection (PHF)...........................................................................3
2.6 SIM....................................................................................................................3
2.7 Display...............................................................................................................3
2.8 Display /Keypad LED Illumination................................................................... 4
2.9 Keypad Keys .....................................................................................................4
2.10 Volume Down/Up Keys ....................................................................................4
2.11 Camera Key.......................................................................................................4
2.12 On/Off key......................................................................................................... 4
2.13 Gaming (A and B) Keys....................................................................................4
2.14 Media Player Key.............................................................................................. 4
2.15 Navigation Key (Joystick).................................................................................4
2.16 Vibrator .............................................................................................................4
2.17 Earphone (Speaker, Receiver) ........................................................................... 4
2.18 Polyphonic Speaker (Alert, Speakerphone).......................................................4
2.19 Backup Battery ..................................................................................................4
2.20 Microphone .......................................................................................................4
2.21 Real Time Clock................................................................................................ 4
2.22 Camera (Large, Rear) ........................................................................................4
2.23 Camera (Small, Front) K800 ONLY. K790 does not include this camera......4
2.24 Camera Flash..................................................................................................... 4
2.25 Camera Lens Cover Sensor ...............................................................................4
2.26 IR....................................................................................................................... 4
2.27 Bluetooth ...........................................................................................................4
2.28 FM Radio...........................................................................................................4
2.29 Memory Card .................................................................................................... 4
3Repair Actions for Go/No Go Test Failures .................................................................5
4Repair Actions for Calibration Failures .......................................................................5
4.1 K790 ..................................................................................................................5
4.2 K800 ..................................................................................................................5
5Revision History..............................................................................................................6

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
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1General
The purpose of this document is to indicate the electrical level repair actions associated with the different
failure symptoms.
For symptoms that have multiple repair actions, the repair actions are listed in order of their probability of
creating a successful repair. The first action has the highest probability, and subsequent actions have lower
probabilities. The intention is for the repair technician to implement the first repair action and then retest the
phone. If the phone continues to fail the same test, then the technician should continue to the second repair
action. If the phone continues to fail the same test after all of the repair actions are exhausted, then the
phone will be considered not reparable at this level. This document should be used only after the actions
from the Mechanical Trouble Shooting Guide have been exhausted for the specific symptom.
Voltage, current, and resistance information is provided for some symptoms to enable faster repairs.
Perform current measurements using a dummy battery and power supply with digital current display. The
phone should be fully assembled. Perform voltage and resistance measurements with a multimeter.
Purchasing this equipment and performing these measurements is optional but recommended.
Perform current measurements using a dummy
battery and power supply with digital current
display. The phone should be fully assembled.
Perform voltage measurements with a multimeter.
Perform resistance measurements with a
multimeter.

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
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2Repair Actions for Manual Test Failures
Failure Failure Symptom Repair Action
Current draw greater than 300 mAmps •N2000
•K790 ONLY – N1100
•K800 ONLY –
•A1200 – Approved Centers Only
Current draw when powered off •K790 ONLY – N1100
•
•K800 ONLY –
•A1200 – Approved Centers Only
Hangs at gray display. Constant
vibration. Will not power off. •B2100
Draws current when pushing power key,
returns to zero
•D2301
•N2200
Powers on by itself after installing
battery. Will not power off.
•Replace S2500 if damaged
•V2504
No response when pushing power key
(no current change) •Replace S2500 if damaged
2.1 Power On /
Off
Other symptoms •Replace X2200 if damaged
•N2000, D2301
USB icon does not flash
Error message “USB device not
recognized”
•N2300, D2304
•D2301
USB icon flashes
Progress indicator appears with red X •V2301
No response from computer or phone
Measure V2201 with positive lead on
the Anode.
VDC should equal 0.15 to 0.19.
•If VDC is outside of range, then
replace V2201
•V2220
2.2 Software Flash
Other symptoms •D2301, D2304
Charging from power outlet •V2202
•N2000
2.3 Charging
Charging from computer via USB
Measure V2201 with positive lead on
the Anode.
VDC should equal 0.15 to 0.19.
•If VDC is outside of range, then
replace V2201
•V2220
2.4 Charging indicator (RED LED) •V3110
2.5 Hands-Free connection (PHF) •N4202
•N2000
2.6 SIM •Replace X2302 if damaged
•N2000
2.7 Display •Replace X3102 if damaged

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
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Failure Failure Symptom Repair Action
Display and keys work, but they are
dark.
Measure V3102 with the Positive (red)
probe on the anode = 0.16 to 0.19
•Replace X3102 if damaged
•Replace X2501 if damaged
•If VDC is outside of range, then
replace V3102
•V3101
•N2000
2.8 Display
/Keypad LED
Illumination
Display light works, but keys are dark •V3103
2.9 Keypad Keys •Replace X2501 if damaged
2.10 Volume Down/Up Keys •Replace S2502, S2503 if damaged
2.11 Camera Key •Replace X2501 if damaged
2.12 On/Off key •Replace S2500 if damaged
2.13 Gaming (A and B) Keys •Replace S2505, S2506 if damaged
2.14 Media Player Key •Replace S2507 if damaged
2.15 Navigation Key (Joystick) •Replace S2504 if damaged
•V2500
2.16 Vibrator •N2000
2.17 Earphone (Speaker, Receiver) •N2000
2.18 Polyphonic Speaker (Alert, Speakerphone) •V4101
•N4100
•N2000
2.19 Backup Battery •C2217
2.20 Microphone •B4100
•N4202
•N2000
2.21 Real Time Clock •B2100
2.22 Camera (Large, Rear) •Replace X2505 if damaged
•N2202
2.23 Camera (Small, Front)
K800 ONLY. K790 does not include this camera.
K800 ONLY
•Replace X2510 if damaged
•D3100, D3101
•N2210
2.24 Camera Flash •Replace X2550 if damaged
•V3113
•V2552
2.25 Camera Lens Cover Sensor •Replace X2550 if damaged
•V2500
2.26 IR •H2300
2.27 Bluetooth •N2204
•N2000
•D1400
2.28 FM Radio •N2203
•N2600
•N2000
2.29 Memory Card •Replace X2301 if damaged

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
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3Repair Actions for Go/No Go Test Failures
Failure Repair Action
Fails any part of Go/No Go testing •run the calibration routine
Fails Go/No Go test, but passes calibration
•replace the antenna
•Replace X1002 if damaged
•rerun the phone through Go/No Go
testing
Fails Go/No Go test after passing calibration •change X1000 and retest
4Repair Actions for Calibration Failures
4.1 K790
Failure Repair Action
Fails any part of the calibration routine •Replace X1002 if damaged
•Replace X1000 if damaged
•N1100
4.2 K800
Failure Repair Action
Fails any part of the calibration routine •Replace X1002 if damaged
•Replace X1000 if damaged
•A1200 UMTS – Approved Centers Only

Trouble Shooting Guide, Electrical
4/000 21-2/FEA 209 544/112 C
Company Internal ©Sony Ericsson Mobile Communications AB
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5Revision History
Rev. Date Changes / Comments
A 2006-Jun-09 Initial release
B 2006-July-17 Added support for K790
C 2006-Sep-01 Added A1200 and A1300 to Power On section
Added D1400 to Bluetooth section
Added Calibration section