Flow Chart of Troubleshooting and Circuit Diagrams
5-6
5-4 Sim Part
Q304 pin 5 = "H" ?
Replace Q304 or
Replace PBA
END
Yes
No
Check the circuit around U408
(Serial EEPROM) and data stored in it
Yes
Phone can't access SIM card
Yes
Q304 pin 2, 3 = 3.0 V ?
Replace Q304
Yes
No
After Power ON,
Check SIMCLK Signal on CN302 pin 3
in a few second
After SIM card insert,
CN302 pin 2 = "H(SIMRST) ?
Replace PBA
Replace PBA
Yes
No
No
Q304 pin 4 = 3.0 V ?
Yes
No
Resolder R338
Summary of Contents for SGH-T408
Page 2: ...Samsung Electronics Co Ltd Printed in Korea 01 2003 Rev 1 0 GH68 03159A ELECTRONICS ...
Page 11: ...2 1 PCB Diagrams 2 PCB Diagrams 2 1 Main Top ...
Page 12: ...2 2 PCB Diagrams 2 2 Main Bottom ...
Page 22: ...4 Block Diagrams 4 1 Main Baseband 4 1 Block Diagrams ...
Page 38: ...5 13 5 8 Receiver Part Flow Chart of Troubleshooting and Circuit Diagrams ...
Page 39: ...5 14 Flow Chart of Troubleshooting and Circuit Diagrams ...
Page 43: ...5 18 Flow Chart of Troubleshooting and Circuit Diagrams 5 12 GSM Receiver ...
Page 44: ...Flow Chart of Troubleshooting and Circuit Diagrams 5 19 5 13 GSM Transmitter ...
Page 45: ...5 20 Flow Chart of Troubleshooting and Circuit Diagrams 5 14 DCS Receiver ...
Page 46: ...Flow Chart of Troubleshooting and Circuit Diagrams 5 21 5 15 DCS Transmitter ...
