Marshall Acton not power on

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Speaker

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Pereira @nmpp

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Posted: Jan 8, 2023

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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...

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]

Answered! View the answer I have this problem too

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Hi

on the mainboard do you see any electrolytic capacitors that look to be bulging(electrolytic capacitors look like tall cylinders)

Thanks:-)

Jan 8, 2023 by HelloMacOS

@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

Jan 8, 2023 by oldturkey03

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.

Jan 8, 2023 by Barrie

@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

Jan 8, 2023 by oldturkey03

[image|2840332]

[code]

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

[/code]

Jan 17, 2023 by Pereira

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Pereira @nmpp

Rep: 25

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Posted: Jan 9, 2023

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All capacitors is ok and have 18v.

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3 Comments:

@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

Jan 9, 2023 by oldturkey03

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

Jan 9, 2023 by Pereira

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

Jan 9, 2023 by Pereira

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Hi

on the mainboard do you see any electrolytic capacitors that look to be bulging(electrolytic capacitors look like tall cylinders)

Thanks:-) — HelloMacOS
@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 — oldturkey03
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. — Barrie
@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 — oldturkey03
[image|2840332]

[code]

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

[/code] — Pereira
@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 — oldturkey03
Yes, measures output power supply and capacitors on mainboard voltage is 18v ...is it ok. — Pereira

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Marshall Acton not power on

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