Display /Keypad Led Illumination - Sony Ericsson K790 Troubleshooting Manual

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