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Released on June 23, 1996, Model NUS-001, 64-bit gaming console

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Nintendo 64 PAL – No Signal After Reassembly

I have a PAL Nintendo 64 with the following issue.

When I first received the console, I disassembled and cleaned it. It worked fine.

Video quality was not great, so I replaced all electrolytic capacitors. The console still worked and I could play games.

After final reassembly in it's case, it started showing “No Signal.”

What I did so far:

Disassembled again, this time also removing heatsinks.

Cleaned everything again: card slot, AV cable, jumper pack contacts (even with 800-grit sandpaper).

Reflowed electrolytic capacitors and main chips: CPU, RCP, PIF, DENC, and jumper pack connector pins.

Tested various points with oscilloscope (I can share waveforms if needed).

Swapped my Expansion Pak with a new Jumper Pak.

Replaced power supply.

AV cable is brand new, so I don't think this is the cause.

Tried inserting/removing cartridge and jumper pack while powered on (as suggested in some threads).

At this point the console still gives no video output at all.

Any advice on what I should check next?

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Hi!

It’s probably a broken capacitor.

I would replace them and see how that goes.

As it was working before, it’s probably positioned correctly on the motherboard. But please double check it.

Also, make sure that all the traces are still fine! Please also clean everything with isopropyl alcohol if not done earlier.

Please let us know how it goes!

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8 Kommentare:

Thanks, I've already removed and reinstalled them (the new ones that I've installed at first recap)

I've done capacitance measurements, only one seem not correct but I'm doing the measures on board.

I can try remove them again and measure them of board. I dont have an esr meter, but they are panasonic brand new...

von

My pleasure! I think that one of the new capacitors are having issues. The only way to be sure is to get them out and measure them… or replacing them again for new ones and see how that goes. Sorry..

von

Desolered all electrolytics. Measured their capacitance and they seem all good to me

von

@dan0 Also if I'm correct all ecaps, beside the ones filtering 3.3v 5v or 12v, are connected to the AMP-NUS or to the two audio outputs. Am I missing something?

von

Nope, that is correct so far I know. Something on the motherboard did died... Could be a lot of things. Maybe it's easier to get a broken (donor) motherboard (like with no sound) and swap components with it. It's hard to say atm what is wrong... Sorry.

von

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Ale wird auf ewig dankbar sein.
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