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techknight

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Everything posted by techknight

  1. I was going to say, it should be fairly clear unless something is seriously wrong with the graphics circuitry.
  2. I was asking for details on the crash. What kind of crash is it. Sad mac code? etc....
  3. Yes it can, it constantly communicates with the VIA. Any issues here, the drivers could do strange things. Also, the Hybrid can cause it to crash too. if the 5.2V supplying the system is unstable/noisy. Any details on the crash?
  4. Powerbook 100. That's it. There are 2 caps right next to the PMGR, and the cap goo can actually wick up inside the chip and cause the chip to malfunction. Epoxy to pin bonding on ICs aren't solid. it will migrate.
  5. you can swap the PMGR IC with a known good one to rule that out.
  6. Getting the correct resistor values for one. Someone else has managed to draw up the schematic of the card already. trouble is, I already know he has issues with some of the measurements he took of the values. Like i said previously, thats what causes these things to malfunction. the resistor values get affected by cap juice. Whether it looks "clean" or not, its there... Or was there. I need to study the mathematics of the design against the resistor values to make sure the ones I read, are accurate. if not, adjust accordingly. There are precision divider networks and reference se
  7. Doesn't mean anything. This is definitely bad hybrid behavior. There may be other causes, but I have yet to run in one. (not to say its impossible)
  8. if he can find/decap some SWIMs that would be nice too. Unless you have a cache of those available in some parts house somewhere?
  9. Bad Hybrid. I bet it doesn't indicate charging properly either. the line on the screen is just a bad screen. If I can get the time and energy, i need to finish the hybrid replacement. As I had mentioned in other threads, what happens is the capacitor goo gets into the ceramic substrate and into the printed carbon film resistors and alters their values, which breaks the whole circuit.
  10. 10 Years Later...... Id check the pots too. they can get dirty and do strange things. Clean them with deoxit fader lube.
  11. need a writeup and a list of hardware for this. Maybe if we can find some matching paint, we could cover those screws but that might be a bit critical. I tried to use epoxy on one of my units, and ended up filling the holes on the brass inserts. So i just tossed it away somewhere.
  12. yeah, I have two or three 180c units. all busted out hinges.
  13. Nope, you leave that unit alone, and go on the hunt for another LCD... Or... the one that needs an LCD becomes a parts unit.
  14. could be a couple things. one, the wrong type of UE8 when/if it was replaced. the other? broken traces to the VRAM.
  15. I have been able to install every OS from the legacy CD, ive used that disc for years without issue. your system crashing, I dont know why. I have never had an original, but a volunteer coworker burned me one back in 2000 or 2001. I dont remember exactly when, but thats when I got my copy and that was neat. That was when I was volunteering at a computer recycling/reuse place as a freshman in high school.
  16. LOL that would be hilarious. in an ATX form-factor too! because why not?
  17. Well you would have to implement your own DRAM controller for one. Otherwise studying the memory map could untangle alot of the GLU since it does most of the address decoding for the system. Using the Motorola guide for the overlay or even borrowing that from the Plus/SE might not be a bad idea their either. Anything additional I am missing? maybe it handles floppy selects as well, but I dont recall.
  18. Well if the EAGLE files become open-source, then I suppose the sky is the limit on modifying for modern amenities. Maybe including RaSCSI or BlueSCSI on-board built in somewhere. or changing the 30 pin SIMM sockets over to 72-pin. Replacing some custom logic with newer programmable logic, Possibilities are endless. But I suppose you have to start somewhere, and recreating the original design, consolidating it into a 4-layer board is impressive in of itself. And a good starting point.
  19. Once you make this work, you should consider doing a hackaday.io blog on it. My project got so much interest, it was on the front page of hackaday yesterday. Something to think about
  20. yea, I suppose seeing is believing. I suppose if you use some type of compression method you could get something decent, but decompressing will take CPU cycles on the Mac side. so no free lunch. I am thinking along the lines of a decent modern browser, but the engine is run over a coprocessor.
  21. Yea I do whatever i can saving flybacks. the plastic is getting brittle and cracking open on some old ones too, and you have to reseal those with HV rated silicone. like corona dope. And as far as new flyback production? thats news to me. according to @maceffects the parts for flybacks arnt made anymore. so eventually the worlds supply will run out.
  22. This uses the same TDA4605 problematic circuit. You are likely going to have to check the fuse, the MOSFET for shorts, and potentially replace those 2 things if open/shorted, as well as the TDA4605 and opto-coupler. Also inspect the caps. At this point the crystal ball approach isnt going to work here I dont think. youll need to do some troubleshooting.
  23. What? Just remove the glue and add some fresh glue. let it run down the core and fill it up. It will be fine. However, you need to do this sooner rather than later, becuase core ringing can lead to core saturation which will produce alot of heat and eventually destroy the transformer. you have to do this. Also I cant hear the noise anymore, im too old.
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