Level 3 Repair
8-2. PCB Diagrams 8-2-1. Top
8-2
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8-2-2. Bottom
8-3
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8-3. Flow Chart of Troubleshooting Equipments
Oscilloscope
Digital Multi-meter
Power Supply
8960 & Spectrum Analyzer
+ driver, driver, ESD Safe Tweeze Tweezer r
Soldering iron
8-4
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8-3-1. Power On
Mobile phone does not power on.
Charging the battery by TA.
Check the Battery Voltage. Is it more than 3.8V?
No
If its voltage level is extremely low(under 3.0V), 3.0V), Change the battery.
Yes
Power-on the phone and Yes
check the power-on sound
Change the FRONT-LCD ASSY
or motor Vibration. Sound or Vibration is ok ?
No Check the TACT200 (soldering crack, open, etc)
Abnormal
Change the TACT200 TACT200((Power-key switch) And retry to the power-on operation.
Yes
Check the Clock OSC400
No
Change the OSC400. ※ Test
Is that frequency 19.2Mhz?
condition (Oscilloscope setting)
: 20.0us.div (time division) Yes check the initial operation Yes END
8-5
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8-6
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8-7
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8-3-2. Initial Initial Failure Yes
Re-download latest SW on the mobile phone.
Abnormal
Abnormal
Re Check "8-3-1 Power on" Trouble shooting process
Check the OSC400 OSC400
(Crack, (Crack, open etc.) etc.)
Normal
Change UME300 Abnormal Change PBA
END
8-8
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8-9
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8-3-3. No Service No service Yes Check memu setting setting Menu
→ applications → setting → wireless
mobile networks
→ network
mode
and network
→ setting
→
is auto mode ?
CP : G3502CXXXX Menu → Phone → Keypad → *#1234# → check Phone version CP : G3502CXXXX
→
Check the Main Antenna exists or not
No
No
Check the L104,L142 is well soldered
Re-solder L104,L142 correspondingly.
Yes
No
Check VREF VREF ( VREF ( C102) = 2.0V
Replace Replace the PM400 PM400
Abnormal
Change the Main Antenna
Abnormal Change the PBA Yes END
8-10
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8-11
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8-12
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8-3-4. SIM Card
Insert & Operate SIM 1,2 card
NG
NO
SIM Connector Break down?
Change SIM400,SIM401
YES
No
C461,C465 = 3.0V
Check PM400(PMIC)
YES
Resolder Resolder SIM400,SIM401 SIM400,SIM401
Yes
No
Check data,clk,reset line
Resolder or Replace PM400
Yes
Change PBA
8-13
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8-14
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8-3-5. Charging Part
TA / USB Insert
Yes Charging Sequence Start L607 = 5V ?
No
Reconnect TA or USB
Yes
C642 = 5V ?
No
Change L607
Yes No
C403 = 5V ?
Change U613
Yes
END
8-15
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8-16
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8-3-6. Microphone Part
Check microphone function in voice call receiver mode or in Voice Recording mode Yes
Check the main MIC is placed for any damage
No Resolder Resolder the main MIC (MIC500) (MIC500)
Yes
Check the voltage at L511 = 2.8V
No
Resolder or replace L511 If the voltage level is not fixed, then you have to change MIC
Yes
END
8-17
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8-18
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8-3-7. Speaker Part
Check speaker function. Play MP3 with maximum volume level. Yes
No
Check the connection of Speaker module
Reconnect speaker or replace speaker module
Yes
No
Check the signals on L513, L516
Replace SPK
Yes
No
Check the signals on C528, C529
Replace UCP300
Yes
END
8-19
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8-20
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8-3-8 Receiver Part
Check receiver function in voice call receiver mode. Yes
Check the receiver module for any damage (tear in FPCB, crack, etc)
Yes Replace receiver module
No
No
Check the signals on C511, C512
Replace UCP300
Yes
END
8-21
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8-22
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8-3-9. BT/WIFI
BT/WiFi is not working
Yes No
Check BT or WiFi function ON
Enable BT or WiFi Function
Yes No
Check the Status of C240,C292,ANT201
Resolder or Replace C240,C292,ANT201
Yes
Replace BT/WIFI Antenna
Yes
END
F202 ANT201
WL_BT_ANT
C239
4
OUT
IN GND1
C241
1
2
R214
C292
C240
1 2
GND2
3
C209
L222
L221
1 2
L226 1 4 2 R
8-23
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8-3-10. LCD
Power Switch On
LCD Display On?
LCD FPCB connector is co rrectly connecti ned?
NO
Correctly connected NO
Yes
Yes
C618 LED_P_26V=26V? NO
Yes
CHECK LCD DATALINE (LCD_SDA,SCL) Yes Replace LCD
Replace U602 & Check L603,L605,L608 NO NO
&
Replace or Resolder L603,L605,L608
Resolder or replace UCP300 Replace PBA
8-25
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8-26
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8-3-11. TSP
Operate TSP NG
Check TSP Connecting
NO
Reconnecting Reconnecting TSP
YES Check LCD Connecting
NO
Reconnecting LCD
YES Check TOUCH_PWR_3.0V
NO
Resolder or Replace PM400
NO
Resolder Resolder or Replace UCP300
NO
Replace PBA
YES Check TSP_SCL,SDA YES Replace LCD
8-27
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8-28
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8-3-12. 5M CAM
"Camera" function does not work
Yes
No
Check the Camera connector on Main PBA
Reconnect the 5M Cam module on SLC600
Abnormal
Check the C610 = C608 = C611 = C609 =
voltage 1.8V 1.2V 2.8V 2.8V
No
Replace PM400
No
Change main board
Yes
Replace the camera module
Yes END
8-29
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8-30
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8-3-13. GSM850/B5 NORMAL CONDITION catch the channel? No Trouble occurs only in GSM850/B5 band?
NO
Try Try 8-3-3 8-3-3 Repair procedure
Yes
Check C193,L141,L135, L133,C150,C145 soldering condition for any damage (crack, open,
Yes
CHECK soldered components C193, L141, L135, L133, C150, C145
No
Check F105 for any damage (crack, open, etc)
Yes
Resolder or change F105
Yes
Resolder or change U101
No
Check U101 for any damage (crack, crack, open, etc)
No Change the board
END
8-31
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8-32
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8-3-14. 8-3-14. GSM1800/GSM190 GSM1800/GSM1900 0
NORMAL CONDITION catch the channel? No Trouble occurs only in GSM1800/GSM1900 band?
NO
Try 8-3-3 Repair procedure
Yes
Check L108,L143,C170,C175, C176,C106,C130 soldering condition for any damage (crack, open,
Yes
CHECK soldered components L108,L143,C170,C175,C176,C106,C130
No
Check U615 for any damage (crack, open, etc)
Yes
Resolder or change U615
Yes
Resolder or change PAM100, U101
No
Check PAM100, U101 for any damage damage (crack, open, etc)
No Change the board
END
8-33
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8-3-15. GSM900
NORMAL CONDITION catch the channel? No Trouble occurs only in GSM900/B8 band?
NO
Try Try 8-3-3 Repair procedure
Yes
Check C153, C145, L117, C121, C168, L118 soldering condition for any damage (crack, open,
Yes
CHECK soldered components C153,C145,L117,C121,C168,L118
No
Check F103 for any damage (crack, open, etc)
Yes
Resolder or change F103,U102
Yes
Resolder or change U101
No
Check U101 for any damage (crack, open, etc)
No Change the board
END
8-35
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8-36
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8-3-16. WCDMA BAND1
NORMAL CONDITION catch the channel? No Trouble occurs only in WCDMA 1 band?
NO
Try 8-3-3 Repair procedure
Yes
Check L140,C144,L148,C143,L128, C146,C167,C195 soldering condition for any damage
Yes
CHECK soldered components L140,C144,L148,C143,C146,C167,C195
No
Check F102,U102 for any damage damage (crack, open,
Yes
Resolder or change F102,U102
Yes
Resolder or change U101
etc)
No
Check U101 for any damage (crack, open, etc)
No Change the board
END
8-37
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8-38
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8-3-17. ISDB-T
Can't activate or search ISDB-T Mode Yes
Check the connection C706,L710,C710,L706, C701
No
1. Put more lead solder each terminal 2. Replace not working or defective component(s).
Yes
Check L700,C701,C702,= 1.8V ± 0.1
No
Resolder the U700, or Change
Yes No
Check 26Mhz Clock on OSC800?
Check OSC800
Yes No
R701 Any Changing Data Signal?
Resolder the U700, UCP300 UCP300
Yes
The End
8-39
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