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