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Growl attempt to repair


wyldcat34

Question

Hi Guys,

Just a question. Have a Growl board with sound issues, starts with sound for a few seconds then goes silent. Shotgunned the caps bar 2 which i need to order. Still exactly the same, sound for a few seconds then nothing. The amp chip feels like the heatsink gets warm really fast - Its a MB3737A. Anyone had issues with these before? And if so, what are the chances of sourcing a replacement one here? Have found one on Aliexpress, but just checking here first.

 

Regards

Garry

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The amp chip is probably fine, but if it gets stinking hot quickly it is probably oscillating. They get stuck in that mode and draw far too much current, they may sound fine while they do it but they get very hot, very fast and can cook themselves to death. Those amps have temperature cut-out so that may well be why the sound is cutting out to prevent it destroying itself.

 

Usually the cause is damaged or aged filter capacitors that strip out the (normal) high frequency noise on the PSU rails. Check the two capacitors on the 12V rail, there will be one big electrolytic (1000uF or more) and one small poly cap (100nF or so), both between 12V and ground, and both are required to strip out the full range of noise from the PSU.

Edited by Womble
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The amp chip is probably fine, but if it gets stinking hot quickly it is probably oscillating. They get stuck in that mode and draw far too much current, they may sound fine while they do it but they get very hot, very fast and can cook themselves to death. Those amps have temperature cut-out so that may well be why the sound is cutting out to prevent it destroying itself.

 

Usually the cause is damaged or aged filter capacitors that strip out the (normal) high frequency noise on the PSU rails. Check the two capacitors on the 12V rail, there will be one big electrolytic (1000uF or more) and one small poly cap (100nF or so), both between 12V and ground, and both are required to strip out the full range of noise from the PSU.

 

 

Thanks Womble.

I have shotgun the caps with new ones (a couple looked leaky) as there wasn't a stupid amount of them. Same issue is still prevelant.

 

Cheers

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