Sony Ericsson K750I Schematics 1
Trouble Shooting Guide, Electrical
1 Abstract
The purpose of this document is to provide a sequence of repair actions associated with
different failure modes. 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 steps specified in the Mechanical Trouble
Shooting Guide have been exhausted for the given problem area.
2 Repair Actions for Manuel Test Failures
Test Repair Action
Backup battery 1) C2606
Camera 1) X2510
Capacity 1) N2600
Charging
USB charging 1) N2802
Display 1) X2500
FM Radio 1) N4100
IR communication 1) H2410
Illumination, Display
If the battery indicator does not show the correct
level and the phone shows fully charged when the
charger is connected.
Use the software fix in EMMA III.
1) V2610 & V2681
2) N2600
1) N2300 Earphone
2) N2600
1) N2500
2) X2500
3) N2600
1) X2500 Illumination, Keyboard
2) N2600
4/000 21-2/FEA 209 544/94 F
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Sony Ericsson Mobile Communications AB
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Trouble Shooting Guide, Electrical
1) Z2450 Joystick
2) S2420
Components that can break
V2411, V2412, V2413, V2414,V2415 & C2462
during repair of the joystick
(S2420) or ESD filter (Z2450)
Keyboard & side keys
1) Z2450
3) S2420
4) S2411, S2414, S2415
Red LED 1) H2500
Microphone
1) B2370
2) N2300
3) N2600
Memory Stick 1) X2950
On/Off
1) S2410
2) V2416
3) B2200
4) D2230
5) X2600
6) N2600
Can’t power off 1) V2410
Real Time Clock 1) B2200
1) J2401 SIM
2) N2600
Speaker 1) N2310
USB 1) N2802
Network
1) X1100
2) N1100
3) N2600
4/000 21-2/FEA 209 544/94 F
©
Sony Ericsson Mobile Communications AB
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