![background image](http://html.mh-extra.com/html/samsung/sgh-t408/sgh-t408_service-manual_1191127028.webp)
5-3
Flow Chart of Troubleshooting and Circuit Diagrams
5-2 Initial
Initial Failure
After power on,
check and repair the important
signals of U406 as follows
END
No
Downloading SW is OK ?
(Is CSROM signal OK ?)
The node
between R456 and C462
= "H" (RST)
No
Check the circuit
related to reset
R461 = "H" (BOOT)
No
Resolder R461
Yes
R471 = "H" (MSIZE)
No
Resolder R471
Yes
R484 = "L" (EXTPROC)
No
Resolder R484
Yes
Replace PBA
Check all the other connection
by Test S/W
Check the circuit around LCD
Check the circuit
around U408(EEPROM)
and data stored in it
Yes
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 ...