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replacement for defect 20w class-d 9744 amp
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replacement for defect 20w class-d 9744 amp

by Lastrip on Tue Jul 30, 2019 1:17 pm

Hello, I received my order (ORDER #2083157-8435644868) and began testing the parts, one of the 3 Stereo 20W Class D Audio Amplifier - MAX9744 (PID: 1752) is not working. I ran the same tests, re-tested, made sure, and nothing is happening. Can I get a new one ?

thanks

Lastrip
 
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Re: replacement for defect 20w class-d 9744 amp

by franklin97355 on Tue Jul 30, 2019 1:36 pm

How do you have it connected and how are you testing it? Can you post a picture of the non-working unit and its connections?

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Re: replacement for defect 20w class-d 9744 amp

by Lastrip on Thu Aug 01, 2019 12:10 pm

IMG_9444.JPG
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Hello, I am plugging 12v battery power on the 2.5mm onboard connector and I am getting sparks on the battery terminals. I made sure my leads we not shorting, then made sure the 2.5mm connector was not faulty and shorting, everything is ok. so the shorting is on the pcb somewhere. the only thing weird I am noticing is that I am getting ground on the VDD through hole...is this normal ? should I be testing elsewhere on the PCB (I don't have a diagram) ?

I have setup the second amp in analog mode, and it works just fine with the exact same battery. The 3rd one has been soldered for analog mode but is doing the same sparky thing...I should have tested it before soldering so I am not asking for refund on that one I guess..
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IMG_9446.JPG
IMG_9446.JPG (107.35 KiB) Viewed 37 times
IMG_9445.JPG
IMG_9445.JPG (77.67 KiB) Viewed 37 times

Lastrip
 
Posts: 2
Joined: Thu May 25, 2017 12:21 am

Please be positive and constructive with your questions and comments.