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NE555

6502
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  1. NE555

    PM 8500 no boot

    Then it's time to replace those capacitors
  2. Got it fixed. just needed to adjust the video resolution as previously stated.
  3. NE555

    PM 8500 no boot

    Do you still have that card?
  4. NE555

    PM 8500 no boot

    So did replacing the capacitors and new heatsink paste then remedy the situation?
  5. NE555

    PM 8500 no boot

    true... although I found that clean contacts slide a lot easier
  6. NE555

    PM 8500 no boot

    There are some obvious things that come to mind. Like the way the Memory SIMMS is arranged. When I had the memory SIMMS in the wrong order, then exactly what you described would happen. Download the service manual for your Computer and arrange the memory the way it is described there. Actually start with the minimal items back on the Board and see if it comes back on. Also buy a fiberglass pencil and clean the contacts with it. Are the VRAM SIMMS in the right order?
  7. tried another LCD, I don't think the problem is the LCD , it would be uniform all across. Not just the background.
  8. Can you guys help me with this strange artifacting on my 8500? I am having a suspicion it could be the VRAM SIMMS, but what do I know? That's why I'm asking You can see that it only seems to affect the background Not the windows themself.
  9. NE555

    another simasimac

    @Bolle Address lines 23 to 31 where do they go from the CPU? I traced 25-31 to UJ6
  10. NE555

    another simasimac

    I had some partial success. I found a dateline that has been OL and when I traced it out I found out that it ended up in a via by C12. I was able to reconnect that Data line back to the CPU. and now I get some distorted boot chime and a variation of Simasimac. I guess I'll have to probe the address lines next. Thank you for following up
  11. NE555

    another simasimac

    all data lines from the floating processor to ROM are good. My CPU is not socketed
  12. NE555

    another simasimac

    It can't be more boring than some of the videos that are on youtube at the moment. I can't find any traces that are OL. But I am getting the feeling that even if a trace might not be bad It might have a resistance that makes it useless? As I said I would like to see a video like this just to be able to compare to a baseline. Maybe someone testing the board with an oscilloscope even. check between CPU and anything else sounds extremely generic. How many have actually fixed a Simasimac SE/30? And I don't mean one that just needed C6 and C7 replaced
  13. NE555

    another simasimac

    I wished someone would make a youtube video of that process
  14. NE555

    another simasimac

    thank you for that info.
  15. NE555

    another simasimac

    I recapped the SE/30 logic board. then upon start up , there is no bong, no error chime. just a Simasimac screen. I have been trying to trace things out and found a whole bunch of vias without solder in them. Been trying to fill them with solder and a piece of wire. So far the Simasimac persists. I keep finding more and more empty vias. I am not sure if what I am doing is actually helping in any way. All the rails seem to get the proper voltages. LS166 has been replaced already. what's next?
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