Keyboard not working, only mouse buttons working: Re-Amiga - UPDATE

[dingebre]

Remote troubleshooting is impossible, I truly understand that. I'm just hoping for an idea or two to help me head in the right direction.

PRIMARY PROBLEM/SYMPTOMS:
1. Known working keyboard is not recognized and no key input is registered.
2. The motion of a known working mouse is not recognized but both buttons work.

SECONDARY PROBLEMS/SYMPTOMS:
1. Plugging in an expansion board either prevents booting all together or gives a recoverable error.
     a. ZZ9000 graphics card prevents booting all together.
     b. GottaGoFazt3r RAM card pops a recoverable error.

HARDWARE:
1. Re-Amiga PCB (pre-built and tested, not by me).
2. A3660 accelerator with 68LC060 50 MHz.
3. 16Mb Fast RAM.
4. 2Mb Chip RAM.
5. No floppy, GoTek, CD, etc. connected at this time.
6. 300 Watt BeQuiet SFX power supply.
7. Amiga 4000 Desktop Daughterboard Replacement. The one with the SFX connector and other features (pre-built and tested, not by me).
8. CF Card adapter.
9. 3.2.2 ROMs and OS 3.2.2.1 for an A4000D. Two different installations. One is a clone of my working vintage A4000D, ZZ9000, GottaGoFazt3r, etc. One is a simple clean OS 3.2.2.1.
10. Tried two mice which both work on my vintage A4000D. One is a NOS (I think so anyway) genuine Commodore mouse. One is a new laser mouse converted to work with an Amiga.
11. Let me know if you need more info...

WHAT I HAVE DONE/OBSERVED:
1. I installed DiagROM Rev 1.3 and it starts fine. After it's up and waiting, it is on test 0, System Information. That is the only one I can run since no keyboard or mouse. It seems to run fine and it recognizes 16 Mb Fast RAM and 2 Mb Chip RAM.
2. When I boot with the 3.2.2 ROMs, either CF card, it boots to workbench no problem and it is clear that at least the right mouse button is recognized.
3. I can do a double mouse click to get to the boot menu, but I can't select anything.
4. I tried the ZZ9000 and GottaGoFazt3r is various slots with the same results. The ZZ9000 prevents booting (even with the OS that has the right drivers even though without drivers the ZZ9000 is essentially just a scan doubler and HDMI adapter). The GottaGoFazt3r pops a recoverable error.
5. DiagROM does not seem to see the additional RAM from the GottaGoFazt3r although I can't get to any test except the System Information.
6. If it's a clue, when I plug in the laser mouse, the laser illuminates.

MY "GUESSES":
1. Somehow I torched a CIA chip?
2. There is a jumper somewhere I've messed up?
3. I torched some other support logic chip?

SPARE PARTS:
1. I have extra custom chips and the tools/skills to replace them.
2. I have an extra re-Amiga motherboard, but I am loathe to swap it for fear there is something going on that blew the one that is installed.
3. I have a vintage working A4000D from which I can borrow parts to some extent.
4. I have some spare GALs (is that what they are?) if I need them
5. I'm happy to source other parts if I need to. Well not happy, but very willing if I need to.

EXTRA NOTES:
1. For video, I have a Medusa-SC adapter connected to the RGB which is converting the RGB to an HDMI signal (I don't have a 15KHz monitor anymore). The Medusa-SC is reporting an Amiga PAL video signal.
2. I have not played with any jumpers other than the external clock jumpers, J100 and J104, moving them to 2-3 for the external clock mode to accommodate the A3660 as indicated on the solder side silk screen on the A3660 PCB.

Seriously, any ideas will help, and many, many thanks.

David

[Castellen]

A quick initial reply as I'm short on time at the moment....

What's the history of this board?  Was it previously all working, then something happened, and these faults appeared?  Or did you buy it pre-built where presumably whoever soldered it up couldn't figure out the issues and sold it?

I'd suggest ignoring the expansion bus issues for now as that's a bit more complex.  The keyboard and mouse issues should be simple enough to diagnose to start with.  What test equipment do you have available?  Hopefully an oscilloscope.

[dingebre]

Thank you Castellen! You have always provided excellent ideas and insight.

I do have a scope, well several in fact. I've been fascinated since I was a kid watching my dad build/troubleshoot/repair electronics. I also have various meters, soldering equipment, and hand tools.

But the issue may be moot. See the following update...

David

[dingebre]

There is an update, but it is a bit troubling in some ways because the problem might actually be gone, at least for the most part.

In the process of trouble shooting with DiagROM (the serial connection was surprisingly easy to get going), and swapping/comparing with my second re-Amiga motherboard, my second riser, and second ZZ9000, the keyboard and mouse actually started working on the original motherboard… The original riser, however, didn’t work on the original or second motherboard, curious. When I used the second riser, the GottaGoFazt3r and ZZ9000 work fine. I’m not convinced the first riser is faulty, I suspect user error more than a board fault. Just the same, I have no clue why all of a sudden the mouse and keyboard started to work.

So, I’m still trying to carefully go through things to make sure I know what does and doesn’t work, but the fact the mouse and keyboard just started working again is great, but troubling. I need to step back and follow a more thoughtful and logical sequence of investigating everything, especially since both mother boards work (I think?).

For now, my goal is to get one system put together and working and then come back to the original motherboard and give it another go. I can’t see why the one riser wouldn’t work unless my safe handling didn’t work and I fried it. I'm going to go with what I know works to get this one system going and then have a deeper look at the first motherboard.

Thanks for any time anyone spent thinking about this.

David

[Castellen]

So, I’m still trying to carefully go through things to make sure I know what does and doesn’t work, but the fact the mouse and keyboard just started working again is great, but troubling.

I don't think the intermittent keyboard/mouse issue is anything you're doing wrong.  The one thing common that fits both symptoms is the input lock circuit.  The front panel key switch disables data from the keyboard and the mouse movement - but not the mouse buttons.

The circuit is configured so that without the key switch connected, it'll default to the enabled state.  If there's an issue with a poor solder joint, or cracked SMD resistor for example; that could create a floating input situation, which would explain the intermittent behaviour you're seeing.  I'd start by checking pullup resistors R206 and R207, and all the solder joints on U131.

Have a look at page 4 of the schematic and you'll see what I mean.  Note that the 7406 inverter gate is open collector output.
http://amiga.serveftp.net/Schematics/A4000_schematics/A4000_Rb_schematic.pdf

The expansion bus issues sound like a different issue, perhaps related to the riser.  You should be able to narrow that down by a process of substitution as you're doing.

[dingebre]

Sigh... When I was ready to first turn on the A4000, I went to the schematic to understand the keylock circuit to determine if CN200 needed a jumper or if it should be left open. I got it backwards and decided it needed a jumper. When I tried the second motherboard, thankfully, I forgot to install a jumper on CN200.

That's what I get for trying to think...

Thank you. I am much happier knowing why the keyboard and mouse were locked.

David

[dingebre]

If the jumper on CN200 wasn’t enough, both riser cards work fine, too 🙄

I don’t deserve an Amiga…

David