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Possible damaged Soundqubed Amp need help asap??


Tjwubs34

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Alright guys so i just picked up a soundqubed 3500 v2 amplifier from a local seller. I got it home checked out the internals. Eveything looks great. What caught my eye was a burn mark on the board. I asked the guy if he knew anything about it and he said the previous owner before him blew one of the power supply fets and the owner replaced it and the board obviously has a burn mark now which he failed to mention at the sale lol But he hooked it up to his subs and it played fine he played for like 15 minutes and the amp was not even 1 degree colder than when i first felt it. So my question is, will the burn damage cause any effects to the board? Will it still be able to produce the power it says it will? Will the burn mark grow bigger eventually frying the whole board??? Please help so i can get this fixed asap!

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

On 5/8/2011 at 7:38 PM, Kranny said:
On 5/8/2011 at 7:35 PM, 'Maxim' said:

It hurts me inside when I read stuff like this and remember you're 15

LMFAO so true

:blush:

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

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Hook it up and see if it works? A little burn mark shouldn't hurt anything. As long as a trace or jumper isn't burnt in half it is probably ok.

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

yes it works and plays fine. the owner played it on 18 volts power blew a fet. I am concerned the burn mark will get worse or could eventually cause problems down the road

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

yes it works and plays fine. the owner played it on 18 volts power blew a fet. I am concerned the burn mark will get worse or could eventually cause problems down the road

No, a burn mark shouldnt grow and get worse if the amp is running fine, unless like said already, it wasnt repaired correctly and could blow again. The real only concern in my mind is the fact he only replaced the blown fet and not the whole side of fets. But if you say it plays fine, I wouldn't worry about it.

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

yes it works and plays fine. the owner played it on 18 volts power blew a fet. I am concerned the burn mark will get worse or could eventually cause problems down the road

No, a burn mark shouldnt grow and get worse if the amp is running fine, unless like said already, it wasnt repaired correctly and could blow again. The real only concern in my mind is the fact he only replaced the blown fet and not the whole side of fets. But if you say it plays fine, I wouldn't worry about it.

from the picture it looks like he replaced the whole row and the surround resisitors. yeah im just worried it could of gone through the board to the trace i cant tell unless i take it all apart

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

yes it works and plays fine. the owner played it on 18 volts power blew a fet. I am concerned the burn mark will get worse or could eventually cause problems down the road

No, a burn mark shouldnt grow and get worse if the amp is running fine, unless like said already, it wasnt repaired correctly and could blow again. The real only concern in my mind is the fact he only replaced the blown fet and not the whole side of fets. But if you say it plays fine, I wouldn't worry about it.

from the picture it looks like he replaced the whole row and the surround resisitors. yeah im just worried it could of gone through the board to the trace i cant tell unless i take it all apart

Power supply fets blowing are not nearly as bad as output fets blowing.

A power supply fet has one job: to supply a constant voltage at a varying current.

This being said, they're not stressed like an output fet is. This means a little burn mark isn't gonna do shit.

Now with an output fet that get's hotter, the only thing a little burn mark would matter is if it was from the board getting excessively hot from something going wrong with the fet in current operation.

However, if that was happening, the amp wouldn't play right at all, there would be symptoms, such as popping when it turns on. When a fet gets that hot, it's got a short in it. That'd make itself known real quick, considering most of those fets are probably 150 avg fets.

In the end, a burn mark doesn't mean shit unless it was caused by something other than a component that has BLOWN. A component that is FAILING is much more dangerous to you and the amp than a failed component.

If I were you, I'd do this:

Put it on a normal volume and play the thing through a woofer.

Make it run until it gets around 100 degrees in temperature (as hot as a lukewarm cup of coffee).

Feel the chassis for any hot spots. You'll feel it if a fet is dissipating more heat than it should, especially with a large amp.

If you feel a spot that feels especially warm, like 10 degrees hotter (this is really noticeable). The best example I can give for how much warmer for it to feel is like walking from inside your house in the summer with the AC on, then walking outside into the humid air.

I will make note though: not all fets short that bad. However, unless you have a heat gun and can measure the temperature of each individual fet while it's running, then good luck trying to find a fet with a minor short in it.

If I'm totally honest though, fuck everything I just said and use the damn amp. It's 3am and I'm ranting on about simple diagnostic shit when in reality if all the fets in that bank were replaced you probably have nothing to worry about.

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Oof, he only replaced one of the fets? All of the fets should be from the same batch.

it looks that whole section was replaced and the resistors around it too i literally couldnt even tell it was repaired other than the burnt mark in the plastic. Its roughly 6 millimeters wide. I cant figure out how to post a picture of it or i would lol

yes it works and plays fine. the owner played it on 18 volts power blew a fet. I am concerned the burn mark will get worse or could eventually cause problems down the road

No, a burn mark shouldnt grow and get worse if the amp is running fine, unless like said already, it wasnt repaired correctly and could blow again. The real only concern in my mind is the fact he only replaced the blown fet and not the whole side of fets. But if you say it plays fine, I wouldn't worry about it.

from the picture it looks like he replaced the whole row and the surround resisitors. yeah im just worried it could of gone through the board to the trace i cant tell unless i take it all apart

Power supply fets blowing are not nearly as bad as output fets blowing.

A power supply fet has one job: to supply a constant voltage at a varying current.

This being said, they're not stressed like an output fet is. This means a little burn mark isn't gonna do shit.

Now with an output fet that get's hotter, the only thing a little burn mark would matter is if it was from the board getting excessively hot from something going wrong with the fet in current operation.

However, if that was happening, the amp wouldn't play right at all, there would be symptoms, such as popping when it turns on. When a fet gets that hot, it's got a short in it. That'd make itself known real quick, considering most of those fets are probably 150 avg fets.

In the end, a burn mark doesn't mean shit unless it was caused by something other than a component that has BLOWN. A component that is FAILING is much more dangerous to you and the amp than a failed component.

If I were you, I'd do this:

Put it on a normal volume and play the thing through a woofer.

Make it run until it gets around 100 degrees in temperature (as hot as a lukewarm cup of coffee).

Feel the chassis for any hot spots. You'll feel it if a fet is dissipating more heat than it should, especially with a large amp.

If you feel a spot that feels especially warm, like 10 degrees hotter (this is really noticeable). The best example I can give for how much warmer for it to feel is like walking from inside your house in the summer with the AC on, then walking outside into the humid air.

I will make note though: not all fets short that bad. However, unless you have a heat gun and can measure the temperature of each individual fet while it's running, then good luck trying to find a fet with a minor short in it.

If I'm totally honest though, fuck everything I just said and use the damn amp. It's 3am and I'm ranting on about simple diagnostic shit when in reality if all the fets in that bank were replaced you probably have nothing to worry about.

lmao i appreciate the feedback man. i actually talked to soundqubed and a few amp repair places and they said my amp is fine. it burnt the fiberglass coating on the board. they said as long as the traces are okay the amp should be 100% i am unable to play it right now i have a new fi sub coming so hopefully the amp plays to its full potential!!!

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