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Soundbox NO SOUND - repair help

 
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sdinet



Joined: 25 Jun 2008
Posts: 184

PostPosted: Mon Nov 23, 2015 7:50 am    Post subject: Soundbox NO SOUND - repair help Reply with quote

Hey everyone, hope all is well and you are enjoying the Thanksgiving week!

Looking for some advice on repairing a non-ADB soundbox PCB board. One day while using, I heard a loud pop and smelled plastic burning, and now the audio doesn't work. I cant see any visible damage on the board, or even on any components. I suspected the large capacitor, but that wasn't it. Does anyone have any non-ADB schematics, or have any advice on which components to troubleshoot next?

Thanks!

-Nick
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barcher174



Joined: 07 Dec 2012
Posts: 556

PostPosted: Mon Nov 23, 2015 11:44 am    Post subject: Reply with quote

You need to replace the large capacitor and the mono amplifier (The chip next to the speaker). I socket mine after replacement just in case. The amplifier is what made the burning smell. There is a non-conductive plastic sheet under the circuit board that can wear away under the large cap causing it to short. It could also be your speaker going bad causing the amp to blow. You want an 8ohm 5W speaker as a replacement.
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sdinet



Joined: 25 Jun 2008
Posts: 184

PostPosted: Tue Nov 24, 2015 5:05 am    Post subject: Reply with quote

Thanks! Just ordered a replacement Amp IC
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