Speaker Part - Samsung SGH-S720i Service Manual

3-1-7. Speaker Part

Speaker dose not work
Check the LCD
module connection
Check the pin #2 of U400
Check the pin #C1, D1 of U401
Check the pin #4, 16 of U400
Check the pin #48,49 of
Is Speaker O.K?
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YES
YES
="Low"
YES
YES
YES
CN100
YES
YES
END
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Flow Chart of Troubleshooting and Circuit Diagrams
NO
Check the UCP200 & R406
NO
Check or Change the UCP300
& C435,C436
NO
Check or Change the U400, U401
NO
Check the CN100
NO
Change the LCD module
3-15