Speaker Part_2(Receiver) - Samsung SGH-E790 Service Manual

Flow Chart of Troubleshooting

3-1-6. Speaker Part_2(RECEIVER)

There is no sound from the Speaker
Is the terminal of Speaker
Are there any signals at
the PIN#3, #9 of IC9 in
The pin #5, #7
of IC9 in LCD is "Low"
Are there any signals at
the PIN#4, #8 of IC9 in
④
Check
O.K ?
Yes
LCD
Yes
Yes
LCD
Yes
UCP201
END
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No
Replace the Speaker
①
No
Check IC9
②
No
Check UCP201
③
No
Check U100
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