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SGH-X400 Flow Chart of Troubleshooting
7. FM Radio part
FM Radio receiver Function failure
Check the pin5 of the
U1103 is 3V DC
Check the pin16 of
U1101 shows a
periodic waveform(≒
Check the 0.5~2V DC
at the anodes of the
D1101, D1102
Check the pin18 of
U1101 is 1.0~1.5V
Check the 'Audio
signal' waveform at
Check the amplified
waveform at the Pin1
Check the headset
Yes
13MHz)
Yes
Yes
Yes
the C1111
Yes
'Audio signal'
of U1102
Yes
END
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This Document can not be used without Samsung's authorization
No
Check U1103 and the relating parts
No
Check OSC1101 and the relating parts
No
Check the connections of the relating
No
Check the connections of the relating
No
Check the solderings of those capacitors
No
Check for any broken connection
4-12
parts
parts
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