Samsung Galaxy GT-i5500 User manual

GSM TELEPHONE
GT-i5500(i5503 Common)
1. Safety Precautions
2. Specification
3. Product Function
4. Exploded View and Parts list
5. MAIN Electrical Parts List
6. Level 1Repair
7. Level 2Repair
8. Level 3Repair
9. Reference data
Notice :
All functionality, features, specifications and other
product information provided in this document inclu
ding, but not limited to, the benefits, design, pricing,
components, performance, availability, and capabiliti
-es of the product are subject to change without
notice or obligation. Samsung reserves the right to
make changes to this document and the product
described herein, at anytime, without obligation on
Samsung to provide notification of such change.
GSM TELEPHONE CONTENTS
efrcom efrcom

This Service Manual is aproperty of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
Samsung Electronics Co.,Ltd.
2010. 05. Rev.1.0
ⓒ
Country Web Site
North America service.samsungportal.com
Latin America latin.samsungportal.com
CIS cis.samsungportal.com
Europe europe.samsungportal.com
China china.samsungportal.com
Asia asia.samsungportal.com
Mideast &Africa mea.samsungportal.com
GSPN (Global Service Partner Network)

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4. Exploded View and Parts List
4-1
This Document can not be used without Samsung's authorization
4-1. Cellular phone Exploded View
QFR01
QLB01
QRE01
QAR01
QVK01
QBR05
QCA01
QMO01
QCR72
QCR101
QBA01
QBC00
QMP01
QLC01
QME03
QVO01
QKP01
QME01
QSP01
QCR101
QMI03
QIF01
QMI04

- This Document can not be used without Samsung's authorization - 5-2. Cellular phone Parts list : GT-I5503YKATHR
Design LOC
Description
SEC CODE
QAR01
AUDIO-RECEIVER
3009-001490
QBA01
INNER BATTERY PACK-1200MAH,BLK,LTN,M
GH43-03172A
QBC00
ASSY COVER-BATTERY_ROBOT_NO ANDROID
GH98-17666A
QBR05
ASSY BRACKET-CAMERA
GH98-17463A
QCA01
ASSY CAMERA-MODULE,GT-M3710(2M)
GH96-04289A
QCR101
SCREW-MACHINE
6001-002005
QCR72
SCREW-MACHINE
6001-002051
QFR01
ASSY CASE-FRONT
GH98-16925A
QIF01
ASSY COVER-IF
GH98-17391A
QKP01
ASSY KEYPAD-MAIN
GH98-16924A
QLB01
ASSY BRACKET-LCD
GH98-16921A
QLC01
ASSY LCD-GTI5500_ MODULE
GH96-04665A
QME01
DOME SHEET-GT_I5500
GH59-09450A
QME03
TOUCH/PANEL-GTI5500_OPEN
GH59-09820A
QMI03
RMO RUBBER-MIC
GH73-14059A
QMI04
RMO RUBBER-MIC
GH73-13533A
QMO01
MOTOR DC-SCHC250
GH31-00323A
QMP01
A/S ASSY-GTI5500_PBA MAIN (SVC)
GH82-04900A
QRE01
ASSY CASE-REAR
GH98-16926A
QSP01
MODULE-GTI5500_SPK+ENCLOSURE
GH59-09512A
QVK01
KEY FPCB-VOL KEY(GTI5500)
GH59-09533A
QVO01
ASSY KEY-VOLUME
GH98-16919A

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5. MAIN Electrical Parts List
5-1
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
D401 USFZ5.6V-RTK/H 0403-001688
D500 RB520S-30 0404-001172
ZD501,ZD503,ZD505 DF2S5.6FS(TPL3) 0406-001231
ZD506,ZD601,ZD602 DF2S5.6FS(TPL3) 0406-001231
ZD500,ZD504,ZD600 PESD5V0L5UV 0406-001286
D400 DAN222TL 0407-001002
Q500 DTA114EM 0504-001138
Q600 2SK3019 0505-001325
Q400 SI1013X-T1-GE3 0505-002341
U301 NC7SZ00L6X 0801-003200
U300 74AUP1G74GM 0801-003265
U402 STG5123DTR 1001-001488
U500 STG5223QTR 1001-001546
U202 XM2400SN-AL0901 1001-001607
U501 FSA9280AUMX 1001-001645
U502 ISA1000 1003-002047
UME300 K5W4G2GACB-BL50 1108-000348
U200 HFQRX3NFA-033 1201-002971
PAM100 RF3230 1201-003068
PAM101 SKY77701 1201-003091
PAM102 SKY77705 1201-003092
U504 TC75S56FE 1202-001068
U401 MAX8899EWZ-T 1203-006291
U503 KTD259BEHD-TR 1203-006331
U403 FT8010MPX 1203-006346
U101 RTR6285 1205-003297
U201 BCM20780B0KUBG 1205-003839
UCP300 MSM7227-1 1205-004035
U606 AR6003G-AC2B-R 1205-004076
U602 BMA023 1209-001817
U603 MMC3140MS 1209-001989
TH300 NCP15WB473J04RC 1404-001221
R501 RC1005J202CS 2007-000137
R423,R530 RC1005J101CS 2007-000138
R333,R510 RC1005J102CS 2007-000140
R517 RC1005J222CS 2007-000141

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Main Electrical Parts List
5-2
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
R400 RC1005J512CS 2007-000144
R424,R508 RC1005J103CS 2007-000148
R414 RC1005J123CS 2007-000149
R605 RC1005J223CS 2007-000153
R416,R417 RC1005J473CS 2007-000157
R311,R322,R332,R431 RC1005J104CS 2007-000162
R505,R513,R610 RC1005J104CS 2007-000162
R527,R531,R606 RC1005J204CS 2007-000165
R515,R607 RC1005J474CS 2007-000168
R506 RC1005J105CS 2007-000170
R413,R601 RC1005J100CS 2007-000172
R406,R407 RC1005J300CS 2007-001291
R327 RC1005J510CS 2007-001298
R533 MCR01MZP5J183 2007-001333
R500 MCR01MZP5J511 2007-002796
R525 RK73K1ETP150J 2007-002965
R408 RC1005F1003CS 2007-007107
R201 RC1005F153CS 2007-007132
R305,R306 MCR01MZP5F4702 2007-007139
R114,R115 TSR16GJ5R1V 2007-007193
R111 MCR01MZP5F1202 2007-007309
R403 RC1005F2003CS 2007-007334
R410 RK73H1ETP1213F 2007-007468
R409 RK73H1ETP1303F 2007-007480
R404 RK73H1ETP3303F 2007-007573
R108 MCR006MZPJ680 2007-008044
R100,R101,R109,R110 ERJ1GEJ101C 2007-008045
R320,R324,R502,R504 ERJ1GEJ101C 2007-008045
R323 MCR006YZPJ202 2007-008049
R300,R315,R325 ERJ1GENJ104X 2007-008055
R104 MCR006YZPJ151 2007-008057
R301 RC1005F49R9CS 2007-008298
R102,R103,R105,R106 ERJ1GEJ102C 2007-008419
R113 ERJ1GEJ102C 2007-008419
R328 RMC-1/20-330JPA 2007-008420
R418,R419,R420 RMC1/20473JPA 2007-008483

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Main Electrical Parts List
5-3
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
R304 ERJ1GEJ103C 2007-008516
R203 RC0603J301CS 2007-008582
R107,R302,R303,R307 MCR006YZPJ222 2007-008588
R308,R309,R310 MCR006YZPJ222 2007-008588
R321 ERJ2RKF6041X 2007-008766
R528,R529 ERJ1GEJ2R2C 2007-008774
R112,R402 RC0603J510CS 2007-008806
R405 RC1005F2153CS 2007-008812
R421 MCR006YZPJ184 2007-009170
R202 RK73H1HTTC6191F 2007-009794
C210 GRP1555C1H101J 2203-000233
C204 GRP155R71C103K 2203-000254
C160,C200,C203,C208 GRP1555C1H100D 2203-000278
C238,C508 GRP1555C1H100D 2203-000278
C459 GRP1555C1H180J 2203-000425
C216 GRP155R71H102K 2203-000438
C435,C436 GRP1555C1H200JZ01E 2203-000550
C125,C168 GRM1555C1H220J 2203-000627
C173,C248,C319 GRP1555C1H2R0C 2203-000696
C525 GRP155R71H392KA01E 2203-000725
C115,C134,C212,C249 GRP1555C1H330J 2203-000812
C250,C455,C503,C504 GRP1555C1H330J 2203-000812
C514,C517,C518,L117 GRP1555C1H330J 2203-000812
C327,C519,C520 GRP1555C1H470J 2203-000995
C251 GRP1555C1H4R0C 2203-001017
C215 GRP1555C1HR50C 2203-001383
C407,C408 04023G223ZAT2A 2203-001405
C103 CL05CR75BBNC 2203-002677
C239 GRP1555C1H1R8CZ01E 2203-005050
C119 GRP1555C1H3R3CZ01E 2203-005052
C135,C507 GRP1555C1H8R2CZ01E 2203-005057
C118 GRP1555C1H1R2CZ01E 2203-005234
C104,C132,C139 GRP1555C1H1R5BZ01E 2203-005281
C157,C161 C1005CG1H4R7BT 2203-005395
C219,C235,C240 GRP1555C1H5R6BZ01E 2203-005450
C102,C131,C133,C141 GRP0335C1E330JD01E 2203-005682

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Main Electrical Parts List
5-4
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
C209,C211,C245,C320 GRP0335C1E330JD01E 2203-005682
C138,C142,C144,C146 GRP0335C1E220JD01E 2203-005725
C147,C149,C150,C153 GRP0335C1E220JD01E 2203-005725
C156,C158,C170 GRP0335C1E220JD01E 2203-005725
C237,C243 CL03C120JA3GNNC 2203-005727
C123,C124 GRP0335C1E680JD01E 2203-005732
C127,C129,C136,C151 GRP0335C1E101JD01E 2203-005736
C154,C159,C162,C164 GRP0335C1E101JD01E 2203-005736
C172,C437 GRP0335C1E101JD01E 2203-005736
C101,C106,C111,C152 GRP033R71C102KD01E 2203-005806
C205,C206,C225,C226 GRM155R71A104K 2203-006048
C233,C234,C300,C301 GRM155R71A104K 2203-006048
C305,C311,C312,C314 GRM155R71A104K 2203-006048
C316,C329,C444,C453 GRM155R71A104K 2203-006048
C500,C502,C505,C509 GRM155R71A104K 2203-006048
C606 GRM155R71A104K 2203-006048
C430 GRP033R71C221KD01E 2203-006120
C236 GRM33X7R471K16PT 2203-006121
C607 CL05B223KONC 2203-006137
C112,C113,L111,L112 GRM0335C1E3R9B 2203-006187
C105,C109 GRP033R70J103KA01E 2203-006194
C406 GRM155R61A224KE19E 2203-006260
C526 CV105X5R105K25AT 2203-006348
C201,C202,C221,C302 GRM155R60J105KE19D 2203-006399
C304,C307,C315,C317 GRM155R60J105KE19D 2203-006399
C318,C409,C410,C416 GRM155R60J105KE19D 2203-006399
C425,C429,C433,C449 GRM155R60J105KE19D 2203-006399
C450,C456,C458,C521 GRM155R60J105KE19D 2203-006399
C524,C603,C604,C605 GRM155R60J105KE19D 2203-006399
C100,C128,C137,C143 GRM33X5R104K6.3 2203-006423
C145,C155,C163,C165 GRM33X5R104K6.3 2203-006423
C169,C171,C222,C228 GRM33X5R104K6.3 2203-006423
C308,C323 GRM33X5R104K6.3 2203-006423
C321 GRM033R60J333K 2203-006462
C501 GRM21BR60J226ME 2203-006474
C174,C326,C431 GRM0335C1E470JD01D 2203-006556

SAMSUNG Proprietary-Contents may change without notice
Main Electrical Parts List
5-5
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
C325 GRM033R61A222K 2203-006668
C108,C110,C244 GRM0335C1E4R7C 2203-006707
C232 GRM033R61A152K 2203-006712
C400,C401,C402,C403 CV105X5R475K10AT 2203-006824
C404,C420,C440,C441 CV105X5R475K10AT 2203-006824
C442,C443 CV105X5R475K10AT 2203-006824
C303,C306,C310,C313 CL03A104KP3NNNC 2203-006839
C322,C324,C438,C439 CL03A104KP3NNNC 2203-006839
C445,C510,C609,C611 CL03A104KP3NNNC 2203-006839
C207,C220,C224,C227 GRM155R60J225ME15D 2203-006872
C231,C247 GRM155R60J225ME15D 2203-006872
C522 GMK107BJ105KA-T 2203-006978
C148,C167 CL03B103KP3NNNC 2203-006979
C411,C412,C413,C414 CL05A225KP5NSNC 2203-007271
C415,C421,C422,C511 CL05A225KP5NSNC 2203-007271
C512 CL05A225KP5NSNC 2203-007271
C107,C523 CV105X5R106M10AT 2203-007279
C116,C130,C166 CV05X5R475M06AH 2203-007317
C213,C214,C432,C434 CL03A105KQ3CSNH 2203-007369
C452,C608 CL03A105KQ3CSNH 2203-007369
C309,C328 CL05A106MR5NRNC 2203-007385
C241 GRM0335C1ER80W 2203-007403
C417,C418,C419,C423 CV03X5R105M06AH-SAM 2203-007449
C424,C428 CV03X5R105M06AH-SAM 2203-007449
C610 CL05A106MQ5NUNC 2203-007474
C454 F951C106MPAAQ2 2404-001374
BAT400 SM3R3703-R01 2409-001172
C217 LL1005-FH5N6S 2703-001748
C218,L205 CIH05T2N7SNC 2703-002176
L122 CIH05T18NJNC 2703-002200
L502,L504 CIH05T22NJNC 2703-002204
L104,L118,L125,L127 CIH05T3N9KNC 2703-002205
L206,L212 CIH05T3N9KNC 2703-002205
L115,L116 CIH05T3N3SNC 2703-002207
L113 CIH05T2N2SNC 2703-002208
L126 CIH05T4N7SNC 2703-002267

SAMSUNG Proprietary-Contents may change without notice
Main Electrical Parts List
5-6
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
C120,L121 CIH05T8N2JNC 2703-002268
L507,L602,L604,U605 CIH05T68NJNC 2703-002308
C117,C246,L119,L213 CIH05T1N0SNC 2703-002367
L114 CIH05T1N8SNC 2703-002368
L210 LLV0603-F6N8J 2703-002649
L105,L106 LQP03TN5N6J00D 2703-002793
L124 LLV0603-F2N2S 2703-002842
L108,L109 LLV0603-F27NJ 2703-002900
L120 LLV0603-F8N2J 2703-002907
L211 LQP03TN3N3B00D 2703-002918
L107 CIH03T56NJNC 2703-002958
L110 CIH03T22NJNC 2703-002999
L510 MLG1005SR15J 2703-003121
L400,L401,L402,L403 CIG21L2R2MNE 2703-003686
L508 LPS181210T-100M 2703-003748
OSC200 CX3225YB26000L0FLF22 2801-004821
OSC400 EXS00A-MU00031 2801-004909
OSC100 KT3225P19200ACW28ZN0 2809-001345
F600,F601,F602,F603 AVRC-14S-03Q-030-100R 2901-001424
F604,F605,F606 AVRC-14S-03Q-030-100R 2901-001424
F102 SAFEB1G95KA0F00 2904-001847
F103 SAFEB897MAM0F00 2904-001850
F104 SAFEB2G14FB0F00 2904-001864
F101 B9504 2904-001869
F100 SFRG42PY002 2904-001881
F200 SAFEA2G45AC0F00 2904-001944
DUF100 SFXG50PD502 2910-000099
DUF101 SFX897UD602 2910-000100
MIC500,MIC501 SPU0410LR5H-QB 3003-001138
L203 BLM15BB750SN1D 3301-001438
L200,L201 BLM15AG601SN1 3301-001659
L102 BLM15HG102SN1D 3301-001756
L214,L215,L500,L503 BLM15HD182SN1D 3301-001885
L505,L506,L509,L511 BLM15HD182SN1D 3301-001885
RFS100 KMS-560-002-BEF 3705-001731
SLC500 04-6298-706-000-883 3708-002015

SAMSUNG Proprietary-Contents may change without notice
Main Electrical Parts List
5-7
This Document can not be used without Samsung's authorization
Design LOC Description SEC CODE
SIM400 5000-6P-1.5S 3709-001488
CD400 MS110-C10B-C16-H 3709-001580
HDC600 14-5802-044-002-829 3711-006843
HEA601 AXT422164AW1 3711-006943
BTC400 KQ03SB1-3R-BEF 3711-007437
IFC500 HY07-AB0700 3722-002840
EAR500 IJAN4-66 3722-003114
F202 LTU-1005-2G4S1-A3-AT 4709-001905
F201 LTU-1608-2G4H6-A1-AT 4709-001906
SC1 ONBOARD-CLIP-6 GH70-03349A
ANT201 HJ-ICT-02 GH71-08426A
ANT100,ANT101,ANT200 HJ-ICT-05 GH71-08731A
L103,R116,R511 PB-SHORT-1005 GH80-03320A
R425 PB-SHORT-0603 GH80-03321A
R331,R503,R600 -P RES-Z1005-SHORT-P RES-Z1005-SHORT
Please consult the GSPN website (Samsung Portal) for the most recent version of the product's part list.

SAMSUNG Proprietary-Contents may change without notice
8. Level 3Repair
8-1
This Document can not be used without Samsung's authorization
8-1.Block Diagram
VREG_TCXO_2.85V
7227MSM
CINOITACILPPA
&
MEDOM
YROMEM
)RDDG2+DNANENOG4(
N_)3-0(LES_TNA_MSG
FROIPG
0012W_NO_AP
0091W_NO_AP
009W_NO_AP
N)3-0(_LES_TNA_MSG
LTC_RWP_AP_MSG
DNAB_AP_MSG
NE_AP_MSG
1R_AP
NO_ANL
_SPG
ECAFRETNIMCP
)CNYS/NI/TUO/KLC(
ECAFRETNITRAU
)STC/STR/DXR/DXT(
N_TSR_TB
))3-0(TAD/DMC/KLC(
)tib61xM821(tibG4
hsalFDNANENO
)tib23xM46(tibG2
MARDSRDDeliboMPDD
SC_DNAN
EO_DNAN
EW_DNAN
KLC_DNAN
DVA_DNAN
YDR_DNAN
)51:0(2D_MSM
TNI_DNAN
n_KLC_DS,KLC_DS
EKC_DS
SC_DS
SAR_DS
SAC_DS
)3
1
:
0(1
A_M
S
M
)1(AB_DS,)0(AB_DS
EW_DS
)3:0(MQD_DS
)3:0(SQD_DS
)13:0(D_MSM
V8.1_EMSM_GERV
V8.1_EMSM_GERV
V5_TEF_BSUV
+D_BSU
-D_BSU
0849ASF
BSUu
hctiwS
NIAM
TTAB
VREG_PA_2.1V
VREG_RFRX1_2.7V
TUPTUO
EGATLOV
V2.1_1CMSM_GERV
V2.1_2CMSM_GERV
V8.1_EMSM_GERV
V6.2_PMSM_GERV
V6.2_AMSM_GERV
V0.3_MISU_GERV
TUPTUO
EGATLOV
N_TESER_NOP
DLOH_SP
CI
ECAFRETNI
N_TNI_MP
zHK867.23
OIDUA
TRAP
YROMEM
)2IBE(
YROMEM
)1IBE(
TB
ECAFRETNI
IFIW
ECAFRETNI
CIMP
epyT-C
PST
)4:0(CBK
)4:0(RBK
)7:0(F_MAC
AREMAC
LEXIFageM2
FF
DSorciM
V0.3_HSALFT_GERV
AREMAC
ECAFRETNI
HSALFT
ECAFRETNI
YEK
XIRTAM
DCL
DCLNIAM
042*023,"8.2
TFT
CILBDCL
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+DEL
DCL
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OXCT
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KLCBSU
REFFUB
OXCT_IPLU
SH0.2BSU
ECAFRETNI
)888:BGR(]32:0[F_DCL
KLCM/CNYSV/CNYSH_DCL
N_TESER_DCL,ATAD/KLC/N_SC_DCL
-DEL
EKAW_TSOH_TB
NALW_NO_EKAW
IKLC_PEELS
N_TSR_NALW
MISU
tekcoS
V0.3_MISU_GERV
F/IMIS )OI,KLC,TSR(
DXT_TRAU
DXR_TRAU
TUO_XUMA
CDA(
)tuptuo TUO_XUMA
CDA
gnigrahC F/ITRAU
MISU
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V5_TEF_BSUV
DXT_TRAU
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DXR_TRAU
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TNAMF
VREG_MSMP_2.6V
pU-kcaB
paCrepuS
TUOTESER_IBE
LRTC_LB_DCL
DCL
F/ILB
NE_BIV V0.3_TOMV
CIMniaM
TAB_V
7227MSM
C2IW/H
ecafretnI
9988XAM
ecafretnIC2I
0001ASI
)TOMraeniL(
AREMAC
FF,M2
N/P_CIM
L/R_RAE
L/R_VCR
TAB_V
KLC/DMC_DSORCIM
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MDP/OIPG
F/IOIDS ))3:0(ATAD_DSORCIM(
CNYSV_MAC/CNYSH_MAC
F/I_C2I )ADS_/LCS_C2I(
KLCM_MAC/KLCP_MAC
L/R_KPS
CIM_RAE
VCR
tesraE
PMAoiduA
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FV
0849ASF
BSUu
hctiwS
NI_SUBV
JIG_ON
hctiwSBSUu
)0829ASF(
KCOLBFR
SPRGW
MAP
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REVIECSNART
)5826RTR(
OXCT
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Q/IXT
Q/IXR
XRSPG
JDA_OL_KRT
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,FER_CAD
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OIPG
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xlpD
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WAS
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XR0012W
&0012W
009W
MAP
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WAS
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`
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0091_0081MSG
TB
&
MF
OIDAR
)08702MCB(
IFIW
)
3006RA(
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F/I_C2I )ADS_/LCS_SUM(
zHKM62
TUOR/L_MF
regrahC
OIPG
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T3PS
WS
KPSduoL
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)DssalC(
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SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-2
This Document can not be used without Samsung's authorization
8-2. PCB Diagrams
8-2-1. Top

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-3
This Document can not be used without Samsung's authorization
8-2-1. Bottom

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Level 3Repair
8-4
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8-3. LOGIC
8-3-1. Power On
Power switch on
NG
Check the current
consumption
>= 100mA?
Download
NO
Check the U401
Check the clock
C109 =19.2 Mhz ?
Check the initial operation
Check the clock generation circuit
Resolder OSC400
Check the PMIC
relatedtoPS_HOLD
Change the battery
Yes
Yes
Yes
Yes
NO
NO
C443(VREG_MSMC1)=1.2V?
C442(VREG_MSMC2)=1.2V?
C441(VREG_MSME)=1.8V?
C411(VREG_MSMP)=2.6V?
C412(VREG_MSMA)=2.6V?
Yes
NO
Check the clock at
OSC400 =32 KHz ?
NO
Check the TP_PS_
HOLD pin PS_HOL
D=2.6
V?
NO
Check the battery
voltage
>= 3.45?
Yes

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-5
This Document can not be used without Samsung's authorization

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-6
This Document can not be used without Samsung's authorization

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-7
This Document can not be used without Samsung's authorization

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-8
This Document can not be used without Samsung's authorization

SAMSUNG Proprietary-Contents may change without notice
Level 3Repair
8-9
This Document can not be used without Samsung's authorization
8-3-2. LCD Working
Power Switch On
LCD FPCB
connector is co
rrectly connecti
ned?
Replace U503 &Check
neighboring circuits
Yes
NO
Yes
LCD
Replace
C522
LED_P_26V=26V?
F600, F601, F602,
F603, F604, F605,
F606 Resolder
F600, F601,
F602, F603,
F604, F605,
F606 Correctly
mounted?
NO
correctly connect
NO
LCD Display
On?
Yes
Yes
NO