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help fixing audio amplifier no sound out

pharaon

Oct 28, 2014
444
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Oct 28, 2014
Messages
444
it's USB reader and FM radio as well YT-326A
no sound out
it have TDA7057AQ IC
how can i check if IC TDA7057AQ is malfunction with multimeter?





 

Martaine2005

May 12, 2015
4,949
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May 12, 2015
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4,949
I would suggest a good cleaning of the board and it looks like the solder needs a good going over as well. Then see what is and is not working.

Martin
 

Delta Prime

Jul 29, 2020
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Jul 29, 2020
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1,966
it's USB reader
I'll let that one go!

Looks to me like a parts board.
how can i check if IC TDA7057AQ is malfunction with multimeter

Reference data sheet TDA7057AQ provided below.
Check supply voltage Vp, pin# 4
For the dual operational amplifier 4558
Check supply voltage VCC+, pin# 8
 

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  • TDA7057AQ.PDF
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  • GP4558.PDF
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bertus

Moderator
Nov 8, 2019
3,322
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Nov 8, 2019
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3,322
Hello,

@pharaon , It would be nice if you could share the solution.
That way others with a similar problem could be helped too.

Bertus
 

73's de Edd

Aug 21, 2015
3,622
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Aug 21, 2015
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3,622
Is this a flood recovery item and is that being deposited silt on top side of the board and . . . . . .ME TOO ! . . . . .WHAT FIXED IT ?
 
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