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Marshall Acton not power on

I hane one Marshal Acton II , not poer on , but in power suply is it ok have 18v , but im mainboard not have 3,3 v in flat to connect other part ... but have a BT module ok ..and have VCC ..... i think have one problem with one voltage in mainboar...

Atualizar (17/01/2023)

I needed to know which voltages I should have on the IC 54335A. Can anyone help?[image|2840330]

I heve some voltage . i dont have 3,3 v ..see picture[image|2840332]
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on the mainboard do you see any electrolytic capacitors that look to be bulging(electrolytic capacitors look like tall cylinders)



@nmpp post some pictures of your power supply etc. with your QUESTION. That way we can see what you see. Adding images to an existing question


I'd change all the electrolytic capacitors anyway. They are cheap. They don't need to be bulging or leaking fluid to be the cause of the problem. You can measure them properly with a good ESR meter, but it's better just to change them all, even if just one is giving problems.


@automotive I agree with that. My concern is just that there is more going on with that board. I have had plenty of issues with bad MOSFETS and traces on speakers




I needed to know which voltages I should have on the IC 54335A. Can anyone help?



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All capacitors is ok and have 18v.

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@nmpp you got it fixed? Anyhow we would need to see the complete board (both sides). I know it's a pain but trying to fix things remotely is not always easy :-) You also want to let us know where you checked for the 3.3V. I would check the voltage regulators in your DC-DC circuit


Yes, measures output power supply and capacitors on mainboard voltage is 18v it ok.


In my pictures do you know where ic dc-dc ?


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