Flow Chart of Troubleshooting and Circuit Diagrams
5-10
5-6 Speaker Part
Speaker does not work
Yes
R471 = "H"?
(MC_PDN)
Replace the PBA
U105 pin 13 = "H" ?
No
No
Resolder R118
Yes
Yes
Check the clock signal at Pin1 of U302
No
Check the clock generation circuit
(related to U102 and Q100)
Yes
Modify the SPK pins
Check
the depression of
the SPK pins
Is Speaker working?
Change the Speaker
END
No
Yes
Yes
No
U304 pin 3, 9 = 1.8 V ?
CN100 pin 5, 6 = 1.8 V ?
Yes
Yes
No
No
Resolder U304
Resolder CN100
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 ...
