Pioneer VSX-3300 Receiver Wont Power On

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

So I was able to replace the suspect cap, and started re-assembly....now I have a different problem.....

As I started to re-assemble, in between mounting boards and re-installing screws, I would pause, plug the unit in, press the power button and make sure things were still working... which they did for a bit, I would press the power button, I would hear the relay click and the receiver would turn on...

I got to a point where I had to step away from it for a few minutes, and I left the unit powered on....then I heard a strange sound, turned around and I saw a small puff of smoke, but couldnt tell where on the board it came from.....

Now the unit, when plugged in, seems to turn on and looks like it's on by the screen, but for a sneaking reason, I feel like the actual amplifier portion is not turning on and something went awry.......

Can we start to troubleshoot that now?? Any help is appreciated and I can give any readings necessary to keep the process moving........

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

Ahh, good eye, I took another look at the cap, and I think you're right! makes better sense to me now, It does look like it could have leaked electrolyte......

Thanks for your patience with my ignorance......

[CapLeaker]

Re: Pioneer VSX-3300 Receiver Wont Power On

What do you actually mean when you say the cap is "wet" on the bottom, Im not familiar with that term.....

Thanks for the help!

your post #48, second picture. Look at the black rubber where the legs stick out. It looks wet to me as if it had leaked electrolyte.

[R_J]

Re: Pioneer VSX-3300 Receiver Wont Power On

Think of that cap as a battery, a dead battery that draws current but won't hold a charge. The 5v line is trying to charge it through the 100Ω resistor and the cap is drawing so much current it is killing the 5 volt supply. It likely leaked and dried up years ago.

[budwich]

Re: Pioneer VSX-3300 Receiver Wont Power On

your picture appears to show a slight "oil like sheen" on the far side of the left pin... I think that is what is in question. Maybe flux from desoldering??? or leakage from the cap.

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

Physically the cap looks fine, doesnt look bulging or otherwise broken anywhere, although I know that just because it looks fine physically that doesnt mean that it's a good component....It does test low....but the reference to a wet bottom I dont know what he means by that, it wasnt actually wet, maybe it did look that way in the picture?

[petehall347]

Re: Pioneer VSX-3300 Receiver Wont Power On

What do you actually mean when you say the cap is "wet" on the bottom, Im not familiar with that term.....

Thanks for the help!

has it got a leaky bottom ?

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

What do you actually mean when you say the cap is "wet" on the bottom, Im not familiar with that term.....

Thanks for the help!

[CapLeaker]

Re: Pioneer VSX-3300 Receiver Wont Power On

That super cap is not really needed for function. It’s probably just to keep settings, time etc. With the super cap c617 removed, the 100 ohm resistor put back in place, the unit should work now fine. Looks like the old cap is “wet” on the bottom?

[RJARRRPCGP]

Re: Pioneer VSX-3300 Receiver Wont Power On

This is like Xbox, pre-360.

[R_J]

Re: Pioneer VSX-3300 Receiver Wont Power On

This component is a bit rare these days, most equipment uses other ways to backup settings etc.

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

ok, so I then think that the one I purchased is ok...... Now to wait for parts to arrive, man, I wish there were local places to get stuff like this......

[R_J]

Re: Pioneer VSX-3300 Receiver Wont Power On

Yes it is a polarized capacitor it acts like a backup battery in the circuit.

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

Check page 2, and page 7, I think it is polarized, at least from what I can find......Hopefully I picked an ok one, cause I couldnt find any close equivalent on the electrolytic side of selection on DigiKey.......

[R_J]

Re: Pioneer VSX-3300 Receiver Wont Power On

That cap is likely bad, it is a super cap 47mf/5.5v, mille not micro farad used for backup. It is possible the cap has been discharged for so long it won't charge any more and loads the 5v line too much so the micro won't turn on.
You don't need to have a higher voltage cap in that position 5.5v is what it should be.

[budwich]

Re: Pioneer VSX-3300 Receiver Wont Power On

hmmm... might not work. I don't see that it is an electrolytic (ie. polarized) which I believe the c617 is. You need to check that.

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

This is what I purchased.....see attached screengrab.....I couldnt find a suitable substitute with a higher voltage rating, so hopefully this one should do......

[budwich]

Re: Pioneer VSX-3300 Receiver Wont Power On

good work... size isn't necessarily an issue except maybe fitting to the board / mount. You might have to do some mod (ie. jumpering, glue, etc). look for something with the same capacitance and move up in voltage... it will likely be smaller physically (also due to advances in technology).

[thetonywarren]

Re: Pioneer VSX-3300 Receiver Wont Power On

I have one of the cheap multi-function testers and you can see what shows on the screen, looks like it's testing at 34mF, seems low to me, but not sure with this size of cap.....when I look for replacments, I dont see any of similar size, all I can find are supercaps? Is that what this one acutally is, they seem to have different physical sizes than the one I have here.......

[CapLeaker]

Re: Pioneer VSX-3300 Receiver Wont Power On

It’s gotta be that c617 cap. It goes to gnd. Change it and see what happens.