Sony Ericsson K750I Schematics 1

Page 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
©
Sony Ericsson Mobile Communications AB
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Page 2
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
3(4)
Page 3
X1101
X1102
X1103
S2410
S2415
S2411
X2331
X2330
X1100
C2334
V2416
C2606
C1102
IN
C2346
C2347
C2332
L2333
C2331
L2331
V2410
R2606
C2605
S2414
OUT
E2502
E2501
E2503
N1100
C2348
L2343
X2341
Cutout
X2340
L2341
X2501
X2502
TP1
TP2602
TP2601
X2600
TP2600
C2500
C2501
V2500
L2510
L2511
X3210
X3211
E0001
R1602
L1331
C1332
C1331
C1502
N1500
C1500
C2661
ST2620
R2995
R2601
C2602
C2601
B2200
C3214
N3210
C3215
L2334
C2335
C2344
C2343
L2342
L2340
C2340
L2330
L2332
R2604
R1601
ST2642
C1333
C1501
R1501
ST2661
C2633
C2202
C2201
R2205
R3214
C3216
C2339
C2337
N2311
C2338
N2310
R2342
C2327
C2328
C2642
V2600
R2212
R3215
C2336
R2603
C1440
C2662
C2341
C2342
R2340
R2333
R2211
C2730
R2412
R2411
C2724
C2711
C2737
C2739
C2710
C2734
C2701
C2608
C2643
C2624
R2627
C1460
C2630
C2629
C1461
R1451
ST2640
ST2641
SP3210
SP3209
SP3220
R2341
C2603
C2211
C3252
C3253
C2333
C2604
C2380
C2621
C2634
C2372
N2600
C2640
SP2201
C2641
R2216
C2713
R2214
D2200
3269 SP
C2732
SP3219
N3200
SP3230
C3251
C2371
R2325
C2312
C2705
C2704
C2382
R2351
C2313
SP3273
R2202
C2381
R2201
C2731
C2329
R2330
C2622
C2607
C2735
C2703
C2616
C2702
C2379
C2623
R2953
C2322
C2736
R2959
R2404
C2404
R2431
C2330
SP2405
C2431
C2628
SP2430
V2612
L2607
R2997
R2998
C2740
C3256
R3230
C3222
R2632
C2351
C2721
C3255
C3254
C2613
R2322
C2352
C2350
L2608
R2612
C2722
R2999
R2996
SP3272
C3258
ST3260
R3224
R3261
SP3222
C2321
C2353
C2725
S P3270
R2561
R2563
R2567
R2570
R2253
R2250
R2254
R2251
R2408
R2203
R2252
R2223
R2219
R2218
R2213
C2738
C2720
R2210
R2220
C2723
C2726
R2217
C2712
C2733
C2386
R2383
R2384
C2385
C2615
ST2610
SP3266
SP3264
SP3281
C2383
C2311
R2382
R2311
C2310
C2384
R2381
R2435
R2430
R2454
R2453
V2435
R2230
C2752
C2750
D2220
C2760
C2753
C2754
D2230
N2300
V2431
C2441
L2400
C2751
C2741
C2450
C2303
C2320
V2430
V2440
C2302
C2304
R2380
C2436
L2450
V2740
C2435
SP3280
V2432
C2432
C2434
V2433
TP2304
TP2303
TP2302
J2401
TP2301
TP2300
SP3278
R2620
R2599
V2802
R2810
R2805
R2804
N2801
R2806
R2801
C2433
C2858
R2814
R2510
R2830
C2810
N2575
R2802
C2506
R2507
R2829
V2610
R2681
R2730
C2595
R2813
C2524
C2620
R2812
C2509
V2681
V2819
V2730
V2680
C2596
C2599
R2594
N2591
SP3267
R2595
R2580
R2581
V2434
R2811
N2580
V2842
C2840
C2857
V2844
R2815
V2843
C2843
R2512
V2846
V2841
C2671
V2845
V2840
R2671
R2672
C2510
C2847
N2670
R2583
C2846
C2845
C2856
R2816
R2817
N2802
C2672
C2841
R2517
ST2670
X2810
1. VBUS
2. SP REF/FM ANT
3. MIC+/AUX IN L
4. MIC-/AUX IN R
5. SP LEFT
6. SP RIGHT
7. VIDEO STROBE
8. AID/ACB/VPPflash
9. GND
10. D+/DFMS
11. D-/DFMS
12. DCIO
E0002
N4101
C4101
C4103
C4102
ST2531
C2532
C2535
R4144
C2534
C2531
N2500
SP3265
L2530
SP2500
R2530
C4110
C4146
R2535C2541
C4141
C4130
R4130
L4141
C4131
R4114
L4140
SP3261
N4100
C4147C4148C4144
C4142
V4140
V4141
C4145
C4140
R4140
R4141 C4119
C4151
C4122
L4121
C4111
C4150
SP3263
R4143
C4118
L4120
C4120
C4112C4113
Page 4
B2370
C2375
C2376 L2301
C2370
C2373
No routing !
H2500
L2825 L2822 L2821 L2824 L2823 L2820
V2628
No routing !
ST2452
C2453
L2441
C2980
ST2980
C2507
C2981
V2450
ST2450
ST2551
N2980
R2950
C2456
C2455
C2454
20
J2402
1
R2450
C2451
L2508 R2452
C2502
X2950
11
10
C2461
C2459
C2463
C2414
ST2502
C2505
C2460
C2415
C2413
C2458
R2451
R2952 C2950
C2504
C2588
L2532
C2587
C2585
R2951
C2586
10
X2500
11
C2590
C2589
C2591
C2584
C2592
C2583
C2593
C2582
20
C2594
SP3275
S2420
SP3274
V2413
V2411
V2414
V2412
C2462
V2415
R2324
SP3276
V2420
C2457
R2421
R2420
SP2261
R2423
C2452
SP2265
SP2267
SP2262
SP2263
SP2266
SP2264
SP2260
Cutout
H2410
C2420
C2421
R2422
Z2450
C2503
R2560
C2511
R2566R2569 C2573
C2569C2571
C2568
R2568 R2564
C2576
16
15
C2567
R2579
C2560
ST2590
C2570 C2575
30
1
C2561
C2514
C2572
X2510
TP2553
C2580
C2581
C2518
R2515
N2514
C2516
R2513
R2516
C2529
C2523
C2522
1
C2579
C2578
C2566
C2563
R2503
R2565
C2562
C2564C2565
R2562
ST2517
C2521
TP2554
C2520
C2519
N2517
R2519
C2517
R2511
C2512
TP2552
N2511
C2508 C2513
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