Trouble Shooting Guide, Electrical
Trouble Shooting Guide, Electrical
Applicable for K790, K800
Contents
General............................................................................................................................. 2
1
2 Repair 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
3 Repair Actions for Go/No Go Test Failures .................................................................5
4 Repair Actions for Calibration Failures ....................................................................... 5
4.1 K790 .................................................................................................................. 5
4.2 K800 .................................................................................................................. 5
5 Revision History..............................................................................................................6
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Trouble Shooting Guide, Electrical
1 General
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.
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Trouble Shooting Guide, Electrical
2 Repair Actions for Manual Test Failures
Failure Failure Symptom
2.1 Power On /
Off
2.2 Software Flash
2.3 Charging
2.4 Charging indicator (RED LED)
2.5 Hands-Free connection (PHF)
2.6 SIM
2.7 Display
Current draw greater than 300 mAmps
Current draw when powered off
Hangs at gray display. Constant
vibration. Will not power off.
Draws current when pushing power key,
returns to zero
Powers on by itself after installing
battery. Will not power off.
No response when pushing power key
(no current change) • Replace S2500 if damaged
Other symptoms
USB icon does not flash
Error message “USB device not
recognized”
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.
Other symptoms
Charging from power outlet
Charging from computer via USB
Measure V2201 with positive lead on
the Anode.
VDC should equal 0.15 to 0.19.
Repair Action
• N2000
• K790 ONLY – N1100
• K800 ONLY –
• A1200 – Approved Centers Only
• K790 ONLY – N1100
•
• K800 ONLY –
• A1200 – Approved Centers Only
• B2100
• D2301
• N2200
• Replace S2500 if damaged
• V2504
• Replace X2200 if damaged
• N2000, D2301
• N2300, D2304
• D2301
• If VDC is outside of range, then
replace V2201
• V2220
• D2301, D2304
• V2202
• N2000
• If VDC is outside of range, then
replace V2201
• V2220
• V3110
• N4202
• N2000
• Replace X2302 if damaged
• N2000
• Replace X3102 if damaged
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Trouble Shooting Guide, Electrical
Failure Failure Symptom
2.8 Display
/Keypad LED
Illumination
Display and keys work, but they are
dark.
Measure V3102 with the Positive (red)
probe on the anode = 0.16 to 0.19
Repair Action
• Replace X3102 if damaged
• Replace X2501 if damaged
• If VDC is outside of range, then
replace V3102
• V3101
• N2000
Display light works, but keys are dark
2.9 Keypad Keys
2.10 Volume Down/Up Keys
2.11 Camera Key
2.12 On/Off key
2.13 Gaming (A and B) Keys
2.14 Media Player Key
2.15 Navigation Key (Joystick)
• V3103
• Replace X2501 if damaged
• Replace S2502, S2503 if damaged
• Replace X2501 if damaged
• Replace S2500 if damaged
• Replace S2505, S2506 if damaged
• Replace S2507 if damaged
• Replace S2504 if damaged
• V2500
2.16 Vibrator
2.17 Earphone (Speaker, Receiver)
2.18 Polyphonic Speaker (Alert, Speakerphone)
• N2000
• N2000
• V4101
• N4100
• N2000
2.19 Backup Battery
2.20 Microphone
• C2217
• B4100
• N4202
• N2000
2.21 Real Time Clock
2.22 Camera (Large, Rear)
• B2100
• 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
2.27 Bluetooth
• H2300
• N2204
• N2000
• D1400
2.28 FM Radio
• N2203
• N2600
• N2000
2.29 Memory Card
• Replace X2301 if damaged
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Trouble Shooting Guide, Electrical
3 Repair Actions for Go/No Go Test Failures
Failure Repair Action
Fails any part of Go/No Go testing
Fails Go/No Go test, but passes calibration
Fails Go/No Go test after passing calibration
• run the calibration routine
• replace the antenna
• Replace X1002 if damaged
• rerun the phone through Go/No Go
testing
• change X1000 and retest
4 Repair 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
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Trouble Shooting Guide, Electrical
5 Revision 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
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