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Flow Chart of Troubleshooting and Circuit Diagrams
3-1-6. Speaker Part
Speaker dose not work
Check the LCD
module connection
Check the pin #4,8 of U403 =
Check the pin #2,10 of U403
Check the R434,R435,C432,C438
Check the pin #1,13 of
U401 = "High"
Check the pin #4,6,16,18 of
Check the L400,L401,L402,L403
Is Speaker O.K?
YES
YES
"High"
YES
YES
YES
YES
U401
YES
YES
YES
END
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NO
Check the UCP201
NO
Change the U403
NO
Chande or Resolder
R434,R435,C432,C438
NO
Check the UCP201
NO
Change the U401
NO
Change or Resolder
L400,L401,L402,L403
NO
Change the LCD module
3-15
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