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Class D Switching Power Amplifiers and Power D/A conversion

TDA7498E Board
TDA7498E Board
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Old 7th October 2017, 01:27 PM   #1
drauzinho is offline drauzinho
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Hi everyone, I just bought this board:

1 PC New Arrival TDA7498E Digitais Poder amplifi cador Board 2x160 w Alta potencia S tereo BTL220W Mono Amplificador Digital Po wer em Circuitos integrados de Componentes eletronicos & Suprimentos no AliExpress.com | Alibaba Group

But I noticed that one of the channels have a very high distortion even at low volume while the other is ok. I verified all the soldering of the low pass filter (inductors and capacitors) and remade them but didn't seem to work.
Anyone have a clue of what might be ?

Thanks.
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Old 7th October 2017, 04:13 PM   #2
DUG is offline DUG  Canada
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Switch Right and Left speakers and sources (one at a time)

If problem stays with amp channel can you contact the vendor?
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Old 7th October 2017, 04:48 PM   #3
drauzinho is offline drauzinho
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Dug, thanks for the help. I tried switching and only powering one at a time and the problem still persists in the same channel and only with certain high frequencies, not at the highest like 20KHz, but probably at 9-10KHz. I'm in contact with him, the problem is that I needed it working for this month and if he's gonna send me another one, it will arrive only next-next month :/.
Thanks anyway.
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Old 11th October 2017, 02:37 PM   #4
Willy Arias is offline Willy Arias
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I have similar problem with Audiopipe 1500 1d nothing looks burned but not sound
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Old 11th October 2017, 02:51 PM   #5
doctormord is offline doctormord  Germany
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How is "one of the channels have a very high distortion even at low volume" similar to "burned but not sound"?
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Old 12th October 2017, 09:00 PM   #6
xrk971 is offline xrk971  United States
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TDA7498E Board
Check the solder joint on those inductors. They are heavy and stress of shipment sometimes pulls one of the joints loose or it is a cold solder joint. I have had amps like this arrive with inductor completely detached.
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