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Nintendo 64 PAL – No Signal After Reassembly

kiltro
kiltro 7 days ago

Hello everyone!

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.

I was hoping that someone can give me some advice or is available to make a comparison between the measurements made on a working console and mine

drive.google.com/.../1_iCxMZg6JVUPDNlzgr-V5CmYrW0aUk71

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  • dang74
    dang74 6 days ago in reply to kiltro +1
    I have an NTSC version of the N64. I will pull it out of storage and see what's involved in taking it apart. Of course there could be a discrepancy between our waveforms just by virtue of one being PAL…
  • dang74
    dang74 5 days ago in reply to kiltro +1
    It occurred to me that I need a special screw driver to take the case apart. I've ordered the 4.5mm game bit screw driver last night. In terms of basic functionality I observed the following: There was…
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  • dang74
    0 dang74 7 days ago

    As a sanity check do you have another console or piece of AV equipment that you can connect to the TV using that same new cable?  This will rule out that it isn't the TV that is acting up.

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  • kiltro
    0 kiltro 7 days ago in reply to dang74

    The tv works perfectly with a nintendo wii.

    The n64 cable is new, though not original, and I measure 3-4 ohms from the connector pins on the board to the end of the cable.

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  • dang74
    0 dang74 6 days ago in reply to kiltro

    I have an NTSC version of the N64.  I will pull it out of storage and see what's involved in taking it apart.  Of course there could be a discrepancy between our waveforms just by virtue of one being PAL and the other NTSC.

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  • kiltro
    0 kiltro 6 days ago in reply to dang74

    dang74 Yes, you probably don't have denc-nus in your version.

    But it could be very useful anyway.

    Thanks!

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  • dang74
    0 dang74 5 days ago in reply to kiltro

    It occurred to me that I need a special screw driver to take the case apart.  I've ordered the 4.5mm game bit screw driver last night.  In terms of basic functionality I observed the following: There was no video when a cartridge wasn't installed.  If a cartridge is installed with no game controller you get a simple message displayed on the screen telling you that a controller is required.  I was not able to remove the jumper pack with my fingers... I will try again tonight.

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  • kiltro
    0 kiltro 5 days ago in reply to dang74

    Yes, that's exactly what I saw when the console was working.

    Also, if I remember correctly, the jumper pack acts as a terminal for the Rambus bus. So if it's not inserted, the boot won't start.

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  • dang74
    0 dang74 4 days ago in reply to kiltro

    I was able to remove the jumper pack last night... and no video... so this tracks with what you remember.  Maybe you can start posting some of your waveforms... that way I can come up to speed while I wait for the screw driver.

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  • kiltro
    0 kiltro 4 days ago in reply to dang74

    I've added a gdrive folder to the main post. Inside you'll find board pics and the waveform that I have for now, DENC NUS

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  • kiltro
    0 kiltro 4 days ago in reply to dang74

    I've added a gdrive folder to the main post. Inside you'll find board pics and the waveform that I have for now, DENC NUS

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