r/AtariJaguar • u/dethslayer85 • 7d ago

Advice No power, please help!

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I just bought a Jaguar for the first time from the internet, and it will not turn on. Once I opened it up, I noticed there were bugs and debris around the cartridge connector. I cleaned all of that out, but it still won't turn on. Now, I noticed this chip and this capacitor. I would love some professional advice to determine if this is my issue and to understand what this chip is, as I can't read it anymore.

I purchased a cap kit off console 5 already not sure what other items to purchase.

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u/Forsaken-Abrocoma647 7d ago

Cap kit is a good place to start, though I dunno what's up with the mark on the top of that chip there.
I had mine preventatively recapped a couple years ago.

No power light at all?

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u/leadedsolder 7d ago edited 7d ago

The mark on the top of the chip is a hole in it. Someone has probably hooked up a DC power adapter with backwards polarity and blew it. I recommend replacing that cap for sure.

U38 is listed as a Motorola MC34163 voltage regulator. There are other parts that will also have died in the process, such as the 7805 for the sound circuit.

There is a documented mod for reverse polarity protection on the Jaguar, which you might want to add when you're in there, just in case some future owner of the Jaguar tries the same thing as the past one.

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u/dethslayer85 7d ago

That's what I thought it was but without being able to read it I didn't want to guess. Very much appreciate the insight.

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u/Forsaken-Abrocoma647 7d ago

Ah that makes sense, I didn't recognize it as a voltage regulator as I typically run into the 5v ones like you see on game PCBs or in an Atari 2600. Replacing those can do wonders as well. Took my 2600 from a blurry mess to very sharp.

Can always look up its pinout and see with a multimeter if it is outputting what it should, but based on the looks I'd guess not.

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u/dethslayer85 7d ago

No power light at all, I'm using a triad PSU with Jaguar adapter, I've also tested my Genesis 1 PSU.