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Old 9th December 2020, 10:36 AM   #1
sagaryadav is offline sagaryadav
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Default how can i fix this

i am a hobbyist and does not have deep knowledge, so any help would be gratefull.
my swans m59w blew up because of delivery of excessive voltage and on inspection i can see that there is fault in amplifier chip. the amplifier ic tda7294 blew up and i dont know what to do now. i dont have a circuit diagram so i dont know about all the components that need to be replaced and i cant find a replacement of full board either. what do u guys suggest
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Old 9th December 2020, 11:50 AM   #2
avtech23 is offline avtech23  Australia
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how can i fix this
Looks to be catastrophic.

It is possible to replace all the affected parts but the PCB looks to be damaged. When the PCB gets carbonised, it becomes conductive which is not good.

I'm not familiar with the product this board came out of but there are TDA7294 boards on places like Amazon / Ali but beware the chips aren't always legit.

Is it a Holton Precision Audio product you had? I don't see it in their product list and wonder why you post in their forum space?
The ever growing project list.. :NAP140, NAD 3020i & 3225PE, JLH1969, TDA2050, Fender 5F2A Princeton, NE5532 HPA, SHPA, B1 Korg, T2, LM4780. : VSQC Phunk Style, Retro 50W, Filmosound 601, AX14. :Young NAP250, TGM10, TDA7265 (Last in line)..maybe
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Old 9th December 2020, 12:17 PM   #3
jean-paul is offline jean-paul  Netherlands
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Originally Posted by sagaryadav View Post
on inspection i can see that there is fault in amplifier chip.
That is not hard to see This is a goner, sorry.
It's only audio. Member of the non modular PCB design committee.
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Old 9th December 2020, 01:26 PM   #4
JMFahey is offline JMFahey  Argentina
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What is a: "swans m59w" anyway?

Google shows nothing.

That board looks destroyed beyond repair anyway.

Besides the exploding chipamp,the other one on its left is very probably dameged or dead, since both got same high voltage.

Did you plug 110V stuff into 220V mains?
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
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