Samsung SGH-J770 User manual

GSM TELEPHONE
SGH-J770
GSM TELEPHONE CONTENTS
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View and Parts List
6. Main Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
9. Flow Chart of Troubleshooting
10. Reference data
11. Disassembly and Assembly
Instructions
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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.
2008. 09. Rev.1.0
ⓒ
Country Web Site
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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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7. Disassembly and Assembly Instructions
7-1
This Document can not be used without Samsung's authorization
7-1. Assembly
1
43
2
1) Attach conduction tape.[Figure 1]
2) Insert the SLIDE FPCB and CAMERA FPCB
[Figure 2]
Caution
1) Be careful of the possible damage on FPCB
2) Connector should be certainly clicked along 󲉨
marked line.
1) Combine NAVI KEY PAD.[Figure 1]
2) Combine LCD/CAMERA MODULE and fixing soldering
area.[Figure 2]
Caution
1) Be careful of the possible damage on FPCB
1) After adjust FPCB on the LCD, Attach conduction
tape.[Figure 1]
2) After combine Lower, screw the 4 Bolt s .[Figure 2]
1) As seen figure 1, combine the Screw Cap.[Figure 1]
2) combine the 3* 4 KEY PAD on the front.[Figure 2]
<Figure 1> <Figure 2>
conduction
TAPE
SLIDE FPCB CAMERA
FPCB
LCD Module
<Figure 1> <Figure 2>
CAMERA
MODULE
soldering area
NAVI KEY
PAD
<Figure 2>
<Figure 1>
conduction tape
Screw(L3.0)
Torque:1.1~1.3KgfCm
<Figure 2>
<Figure 1>
Screw Cap
3*4 KEY PAD

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Exploded View and Parts List
7-2
This Document can not be used without Samsung's authorization
5
87
6
      
 
       
 
Caution
     
        
  
         
  
       
    
1) After combine BRACKET,screw the 2
Bolts.[Figure 1]
2) Screw the 1 Bolt.[Figure 2]
1) FIX the Antenna module on the PBA.[Figure 1]
2) Screw the 1 Bolt.[Figure 2]
<Figure 2><Figure 1>
BRACKET
Screw(L2.5)
Torque:1.1~1.3KgfCm
Screw(L2.0)
Torque:1.1~1.3KgfCm
<Figure 1> <Figure 2>
Intenna Screw(L2.0)
Torque:1.1~1.3Kgf
Cm
       


 -





 
   


   

SAMSUNG Proprietary-Contents may change without notice
Exploded View and Parts List
7-3
This Document can not be used without Samsung's authorization
910
     
        
  
Caution
                  
   
   



   
 
 

SAMSUNG Proprietary-Contents may change without notice
Exploded View and Parts List
7-4
This Document can not be used without Samsung's authorization
7-2. Disassembly
1
43
2
1) Remove the three kind of side key from the front.[Figure 1]
2) Detach the Connecter of 3*4 key F-PCB.
1) Lift the intenna and PBA and Detach the Slide
F-PCB.[Figure 1]
Caution
1) Be careful with the damage of Slide F-PCB.
1) Disjoint carefully Rear Cover shaking right and
left[Figure 1]
Caution
1) Be careful with the damage of Rear Cover.
1) Detach rear deco and PC sheet on the back of a
set with tweezer.[Figure 1]
2) Unscrew 5points rear bolts on the back of aset.
[Figure 2]
Caution
1) Notice the Scratch on the Rear Cover when the
set disjoint.
<Figure 1> <Figure 2>
Rear Deco
PC SHEET Screw(M1.4,L3)
<Figure 1>
SIDE KEY
<Figure 1> <Figure 2>
3*4 KEY
CONNECTO
R
<Figure 1>
Slide F-PCB
Connector

SAMSUNG Proprietary-Contents may change without notice
Exploded View and Parts List
7-5
This Document can not be used without Samsung's authorization
5
87
6
1) Remove the Screw cap 2points.[Figure 1]
2) Unscrew 4points on the Slide Lower.[Figure 2]
1) Detach the conduction tape from the LCD
module.[Figure 1]
2) Detach the camera/motor/spker.[Figure 2]
Caution
1) Detach the conduction tape carefully.
2) Notice the F-PCB so as not to damage.
1) Unscrew 2points on the bracket.[Figure 1]
2)Removethe3*4keypad.[Figure2]
1) Unscrew 6points on the Front Cover.[Figure 1]
2) Unscrew 1points on the front.[Figure 2]
<Figure 2>
<Figure 1>
Screw(M1.4,L2)
Screw(M1.4,L2.5)
<Figure 2>
<Figure 1>
Screw(M1.4,L2)
Slide F-PCB
Connector
<Figure 2>
<Figure 1>
Screw(M1.4,L3)
Screw cap
<Figure 2>
<Figure 1>
conduction tape
camera/motor/spker

SAMSUNG Proprietary-Contents may change without notice
Exploded View and Parts List
7-6
This Document can not be used without Samsung's authorization
910
1) Remove the NAVI KEY PAD from the
UPPER.[Figure 1]
2) Detach the Slide F-PCB connector and Camera
F-PCB connector from the LCD.[Figure 2]
Caution
1) Be careful with the damage of LCD.
2) Be careful with the damage of F-PCB
1)Detach the conduction tape from the LCD module.
[Figure 1]
Caution
1) Be careful with the damage of LCD.
<Figure 1> <Figure 2>
Camera F-PCB
CONNECTOR
Slide F-PCB
CONNECTOR
NAVI KEY PAD
conduction tape
<Figure 1>

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10. Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
10-1
10-1. Power On
Check the Battery Voltage
is more than 3.7V
'Power On 'does not work
Change the Battery
END
No
Yes
C320(VISA)=2.7
V? Check the PMU related to VINT
No
Yes
Check the Clock at
PM300 14pin
(CLK32K)=32KHZ Resolder OSC300,C316, and C318
No
Yes
C300(+VDD_IO_LOW) &
C302(+VDD_IO_HIGH) ="
H"? Check the related circuit
No
Yes
+VDD_GSM_CORE
=1.2
V? Resolder L300 and L334
No
Yes
Check the initial operation
Yes
Yes

SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
10-2
G
PMU
R300
OSC300
BAT300
1
2
C325
C332
C305
C319
C326
C328
C316
R334
TA300
R325
C314
C317
C310
L300
C329
C312
R307
0
C320
C324
C300
VBAT
ZD300
C313
VBAT
C304
C302
C321
C311
7_RSTHC
8GPO3
9GPO2
3
5
N
E
M
I
S
4
5
T
A
B
V5
5
D
D
V
C
L6
5
VSS
57
C
N8
5
C
N9
5
6SIMIOHC|_SIMOFF
6
4
7
4
D
D
V
2
D
8
4
D
D
V
P
L
9
4
D
D
V
3
D
5_SIMRSHC
0
5
D
D
V
1
D
1
5
T
A
B
V
1
D
2
5
D
D
V
C
L
T
A
B
V
D
C
D
39
4SIMCKHC
0
4
E
V
A
S
V
1
4
D
D
V
1
F
R
2
4
D
D
V
2
F
R
3
4
C
C
V
M
I
S
4
4
D
D
V
C
H
5
4
D
D
V
O
I
T
A
B
V
REFGND
32
VISA
33
VBATSENSE
34
_REC1
35
_REC2
36
CHGCUR
37
USBVIN
38
VCHG
VSS
4
2D
C
O
I
M
I
S
5
2D
C
S
R
M
I
S
_
N
E
M
I
S
6
2
27
NTC
28
_ONKEY
29
MICBIAS
3_IRQ
30
REFC
31
8
1X
L
D
C
D
9
1T
A
B
V
D
C
D
2OSCO
0
2D
D
V
D
C
D
1
2A
D
S
2
2L
C
S
3
2D
C
K
C
M
I
S
1OSCI
10 GPO1
PWREN1
11
12 PWREN2
13 VSS
4
1K
2
3
K
L
C
5
1D
D
V
4
D
6
1D
D
V
5
D
7
1D
D
V
6
D
PM300
C327
VDD_IO_LOW_1.8V
C303
R319
R302
VBAT
R322 100
R320
R321
C318
C315
VDD_GSM_CORE_1.2V
VDD_PLL_1.2V
PWREN2
MIC_BIAS_2.1V
VDD_USB_3.3V
VDD_SD_2.9V
VDD_KEY_3.3V
VDD_VIB_3.3V
MES_BATT
AUX_ON
SIMOFFn
SIM_VCC_3.0V
AVDD_HFA_2.6V
VDD_IO_LOW_1.8V
VDD_IO_HIGH_2.9V
AVDD_2.6V
VDD_SLEEP_2.9V
RSTON
JACK_IN
REF_ON_PMU
32KHz_DIGIT
SDA
SCL
ONKEYN
IT_PMU
V_EXT_CHARGE_5.0V
VCC_SYN_2.8V
VDD_RX_TX_2.8V