Sharp SGH-F250 - Manual (Page 43)

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Flow Chart of Troubleshooting
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9-15
9-6. Speaker Part(Melody)
Speaker does not work
Is the terminal of speaker
OK?
check the specker
No
Yes
END
Check the
SPK_P & SPK_N
"HIGH"
Resolder SPK_P & SPK_N
No
Yes
Check the output circuit
of U401(Audio AMP)
Yes
Change or resolder around U404
Yes
Check the input circuit of
U401(Audio AMP)
No
No
Change or resolder around U403,
U404
Is speaker OK?
No
Change speaker
Yes
①
②
③