1. PBA Repair Guide
[SGH-I900]
Samsung Electronics

2. Contents 1. PBA Diagram 2. Trouble Shooting 2-1. No Power
2-2. Lockup / Reset
2-3. SIM Card Failed
2-4. Camera Failed
2-5. No Vibration
2-6. Bluetooth Searching Failed
2-7. No Charging
3. Appendix
3-1. How to check the voltage and frequency

3. 1. PBA Diagram
SGH-I900
TOP
Diagram
Appearance

4. 1. PBA Diagram
SGH-I900
Bottom
Diagram
Appearance

5. 2-1. No Power (PDA) SGH-I900 Trouble shooting
C668 = 3V
C665, C674 = 1.8V
C667, C677 = 2.6V
Input the power
(3.8V)
Power-on-current
>= 100mA Y Y Y
U304 P1 = 4V
Check UCP600 N N N
Download S/W
(PDA)
Check U304
Check U605
※ It’s a general case. It cannot be available on the special case.

6. 2-1. No Power (PDA) SGH-I900 Input the power 3.8V
2. Check the power-on-current >= 100mA
- If not : Download PDA software (refer to 2-2. Lockup/Reset)
3. Check the voltage U304 Pin number 1 = 4V
- If not : Check the U304 (crack, open, short, etc)
4. Check the Voltage
1) C668 = 3V
2) C665, C674 = 1.8V
3) C667, C677 = 2.6V
- If not : Check the U605 (crack, open, short, etc)
5. There is no problem from 1 to 4, check the UCP600

7. 2-1. No Power (PDA) SGH-I900 Picture 2-1-3, 2-1-4, 2-1-5 UCP600 1 C677● 1
C677 ●
U605
U304 ● ●
C668 ● ●
C667
C674
C665

8. Voltage Div : 1V, Time Div : 1㎳
2-1. No Power (PDA)
SGH-I900
Scope 2-1-3, 2-1-4
U304 Pin number 1
C668
Voltage Div : 1V, Time Div : 1㎳ 4V 3V

9. Voltage Div : 1V, Time Div : 1㎳
2-1. No Power (PDA)
SGH-I900
Scope 2-1-4
C665, C674
C667, C677
Voltage Div : 1V, Time Div : 1㎳
1.8V
1.4V

10. 2-1. No Power (Phone) SGH-I900 Trouble shooting
Input the power
(3.8V)
Power-on-current
>= 100mA Y Y Y
U201 P2 = 1.8V
D300 P2 = 1.8V N N N
Download S/W
(Phone)
Check U201
Check UME201 Y Y
D300 P3 = 1.8V
OSC102 = 32kHz
Check U301 N N
Check
OSC102 or UCP600
Check D300
※ It’s a general case. It cannot be available on the special case.

11. 2-1. No Power (Phone) SGH-I900 Input the power 3.8V
2. Check the power-on-current >= 100mA
- If not : Download Phone software (refer to 2-2. Lockup/Reset)
3. Check the voltage
1) U201 Pin number 2 = 1.8V (Low)
- If not : Check the U201 (crack, open, short, etc)
2) D300 Pin number 2 = 1.8V (Low)
- If not : Check the UME201 (crack, open, short, etc)
3) D300 Pin number 3 = 1.8V (Low)
- If not : Check the D300 (crack, open, short, etc)

12. 2-1. No Power (Phone) SGH-I900 4. Check the OSC102 = 32kHz
- If not : Check the OSC102 or UCP600
5. If there is no problem from 1 to 4, check the U301
(crack, open, short, etc)

13. 2-1. No Power (Phone) SGH-I900 Picture 2-1-3, 2-1-4, 2-1-5 UCP600 2, 3● ●
D300
UME201
OSC102
U201 ● 2

14. 2-1. No Power (Phone) SGH-I900 Scope 2-1-3, 2-1-4 U201 P2, D300 P2, 3
OSC102
Voltage Div : 1V, Time Div : 1㎳
Voltage Div : 1V, Time Div : 20㎲
32kHz
1.8V

15. 2-2. Lockup / Reset SGH-I900 Trouble shooting
(Omnia screen)
Use a PDA J-TAG
Check UCP600
(PDA)
Check UCP600
(PDA)
Download
the latest PDA S/W N
Download
Completed Y
Lockup or reset
(Same as declared) Y N N
Download
the latest Phone S/W
Check UME200
(Phone)
Repeat the
lockup/reset test
Check UCP200
(Phone)
Lockup/Reset
(Phone off
after power on)
Use a Phone J-TAG
※ It’s a general case. It cannot be available on the special case.

16. 2-2. Lockup / Reset SGH-I900 Use a J-TAG to enable USB
- Lockup/Reset on Omnia screen : Use a PDA J-TAG
- Phone off after power on : Use a Phone J-TG
2. Download the latest software
- If download is not completed
: Check the UCP600 (PDA)
(crack, open, short, etc)
: Check the UME200 (Phone)
Picture 2-2-2
UME200
UCP600
UCP200

17. 2-2. Lockup / Reset
SGH-I900
- If download is completed but it still has the same defect
: Check the UCP600 (PDA)
(crack, open, short, etc)
: Check the UCP200 (Phone)
- If download is completed and you cannot find the same defect
: Repeat the lockup/reset test declared originally

18. 2-3. SIM Card Failed SGH-I900 Trouble shooting
Check the 6-pins
of SIM socket
There is durst
or damaged N
Input the power
(3.8V)
Pin 1, 2, 4 = 3V
Pin 3 = 3V Clock Y N
Clean or change
SIM socket
Check U301
or UCP200
※ It’s a general case. It cannot be available on the special case.

19. 2-3. SIM Card Failed SGH-I900 Check the 6-pins of SIM socket
- If there is a durst : Clean the pins
- If it is damaged : Change the SIM socket
2. Input the power 3.8V
3. Check the voltage
1) Pin number 1, 2, 4 = 3V
2) Pin number 3 = 3V Clock
- If not : Check the U301 or UCP200
(crack, open, short, etc)
※ Check the voltage when you input the power on the PBA.
Picture 2-3-3
1 2 3 ● ● ● ● 4

20. Voltage Div : 1V, Time Div : 50㎳
2-3. SIM Card Failed
SGH-I900
Scope 2-3-3
Pin number 1, 2, 4
Pin number 3
Voltage Div : 1V, Time Div : 50㎳
3V Clock
1.9V Clock 3V
1.9V

21. 2-4. Camera Failed SGH-I900 Trouble shooting
There is durst
or damaged N Y
Check HDC500
U512 P3 = 3V
C535 = 1.2V Y N N
Clean or Change
HDC500
Check UCP600
Check U512
※ It’s a general case. It cannot be available on the special case.

22. 2-4. Camera Failed SGH-I900 Check the HDC500
- If there is a durst or damaged : Clean or change the HDC500
2. Connect a camera and input the power 3.8V
3. Check the voltage U512 Pin number 3= 3V
- If not : Check the UCP600 (crack, open, short, etc)
4. Check the voltage C535 = 1.2V
- If not : Check the U512 (crack, open, short, etc)
※ Check the voltage during camera entering mode.
- LCD, TSP and camera must be connected to PBA.
- Input the power and press key number *#0*# → 7

23. 2-4. Camera Failed SGH-I900 Picture 2-4-3, 2-4-4 HDC500 UCP600 U512 3● 3 ●
C535

24. Voltage Div : 1V, Time Div : 1㎳
2-4. Camera Failed
SGH-I900
Scope 2-4-3, 2-4-4
U512 Pin number 3
C535
Voltage Div : 1V, Time Div : 1㎳ 3V
1.2V

25. 2-5. No Vibration SGH-I900 Trouble shooting
Connect a motor
Input the power
Vibration on
There is durst
or damaged N
Check the HDC500
U510 P1 = 3V
C541 = 3V Y N N
Clean or Change
HDC500
Check U609
Check U510
※ It’s a general case. It cannot be available on the special case.

26. 2-5. No Vibration SGH-I900 Check the HDC500
- If there is a durst or damaged : Clean or change the HDC500
2. Connect a motor, input the power (3.8V), Vibration on
3. Check the voltage U510 Pin number 1 = 3V
- If not : Check the U609 (crack, open, short, etc)
4. Check the voltage C541 = 3V
- Check the U510 (crack, open, short, etc)
※ Check the voltage during vibrating.
- LCD, TSP and vibrator must be connected to PBA.
- Input the power and press key number *#0*# → 5

27. Voltage Div : 1V, Time Div : 1㎳
2-5. No Vibration
SGH-I900
Picture 2-5-1, 2-5-3, 2-5-4
Scope 2-5-3, 2-5-4
U510, U541
Voltage Div : 1V, Time Div : 1㎳
HDC500
U609
U510 3V 1 ● ●
C541

28. 2-6. Bluetooth Searching Failed SGH-I900
Trouble shooting
Input the power
Bluetooth on
Search devices
Check
L119, ANT103
There is problem
(crack, open) N
U101 P6 = 3.3V
U101 P5 = 1.8V Y Y N
Resolder or change
Check U101 Y
OSC101 = 26MHz
Check MOD100 N
Check OSC101
※ It’s a general case. It cannot be available on the special case.

29. 2-6. Bluetooth Searching Failed SGH-I900
1. Check the L119, ANT103 (crack, open, etc)
- If there is a problem : Resolder or change it
2. Input the power (3.8V), Bluetooth on, Search devices
3. Check the voltage U101 Pin number 6 = 3.3V, Pin number 5 = 1.8V
- If not : Check the U101 (crack, open, short, etc)
4. Check the clock OSC101 = 26MHz
- If not : Check the OSC101 (crack, open, short, etc)
5. If there is no problem from 1 to 4, check the MOD100
(crack, open, short, etc)

30. 2-6. Bluetooth Searching Failed SGH-I900
※ Check the voltage during searching devices
- LCD and TSP must be connected to PBA.
- Insert a SIM card and input the power.
- Activate on the bluetooth and search devices.

31. 2-6. Bluetooth Searching Failed SGH-I900
Picture 2-6-1, 2-6-3, 2-6-4, 2-6-5
U101 ● ●
5,6
MOD100
OSC101
L119
ANT103

32. Voltage Div : 1V, Time Div : 1㎳
2-6. Bluetooth Searching Failed
SGH-I900
Scope 2-6-3
U101 Pin number 6
U101 Pin number 5
Voltage Div : 1V, Time Div : 1㎳
3.3V
1.8V

33. Voltage Div : 1V, Time Div : 20㎱
2-6. Bluetooth Searching Failed
SGH-I900
Scope 2-6-4
OSC101
Voltage Div : 1V, Time Div : 20㎱
26MHz

34. 2-7. No Charging SGH-I900 Trouble shooting
Connect TA
to the power supply Y Y
Input the power
(5V)
Current = 400 ~ 600mA
U303 P10 = 5V
Check UCP600 N N
Check
U303 or IFC400
Check U301
※ It’s a general case. It cannot be available on the special case.

35. 2-7. No Charging
SGH-I900
Connect TA to the power supply and input the power (5V)
2. Insert a TA to PBA
3. Check the current = 400 ~ 600mA
- If not : Check the U301
(crack, open, short, etc)
4. Check the voltage U303 Pin 10 = 5V
- If not : Check the U303 or IFC400
5. If there is no problem from 1 to 4,
check the UCP600 (crack, open, short, etc)
※ Check the voltage during charging.
- TA can be connected to power supply must be prepared.
Picture 2-7-1, 2-7-2 TA
Insert to PBA

36. Voltage Div : 1V, Time Div : 1㎳
2-7. No Charging
SGH-I900
Picture 2-7-4, 2-7-5
Scope 2-7-4
U303 Pin number 10
Voltage Div : 1V, Time Div : 1㎳
U301
UCP600
U303 ● 10
IFC400 5V

37. 3-1. How to check the voltage and frequency
Equipment : Oscilloscope (Bandwidth : more than 500MHz)
PBA condition : Power on by using power supply
Ground the scope
Put a scope to the point you want to check
Input the power
Ground
Put a scope