Samsung SGH-X640 Service Manual page 37

8. Receiver Part
Receiver does not work
U603 pin 9, 13 = 1.5V?
U603 pin 1, 5 = 1.5?
EAR600 pin 4, 5 = short?
HDC700 pin 40,42 = 1.5V?
SPK +,- PAD = 1.5V?
Check the soldering of the
Is Receiver working?
Yes
Yes
Yes
Yes
Yes
Yes
speaker wire
Yes
Yes
END
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No
Resolder or replace U603
No
Resolder or replace U603
No
Resolder EAR600
No
Resolder HDC700
No
Cange LCD module
No
Modify the speaker wire soldering
No
Replace the Receiver
7-13
Flow Chart of Troubleshooting