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Apple iie Platinum Garbled Screen Part 2

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    I made sure it was dry...


      Are Platinums rare enough to warrant fixing this one?

      Get some good contact cleaner, and burnish all the IC legs and socket pins. If that doesn't fix it, start replacing sockets. Surely this will fix it.
      Be polite and I may let you live.


        cleaning the pins helped quite a bit. I even got it to beep! With the keyboard disconnected, it will now display a checkerboard pattern and beep seven times every 15 seconds or so.


          Your link leads to a sign-in page.

          I expect that all you have to do to get it fully functional is clean the pins and sockets even better.

          If you have a multimeter, you can check the resistance between chip pins and the solder pads on the bottom of the board to see where you have bad connections.

          By the way, it sounds as if it's doing the self-test, so it may already be fully functional minus the Apple keys. If you have the keyboard plugged in, verify that those keys are working. (You may have corrosion on the keyboard connection as well as inside the keyboard).
          Be polite and I may let you live.


            After seeing the photo's I'd be replacing the sockets for sure, even if its currently working when you plug the keyboard back in.

            Those sockets will not be reliable, you are also going to have huge issues with plugin cards intermittently not working due to the corrosion on the slot connectors.


              With the keyboard plugged in, it just displays the horizontal bars so the keys are unresponsive. I'll replace the sockets and get back to you when complete.


                You really do have to address that keyboard, too, sooner or later. I'd do that before replacing sockets, at this point.

                There should be a simple way to simulate the Apple keys, too, (in addition to using joysticks). They are discreet inputs that need to be pulled up or down, that's the part I don't remember. I recommend doing that, so you can see if you can at least get a BASIC prompt.
                Be polite and I may let you live.



                  I finally finished soldering all the sockets today, tested it and it works! The only problem is half of the keys don't work probably from corrosion. But besides that, it boots into the BASIC prompt with a cursor and lets me type.


                    Very nice!
                    Be polite and I may let you live.



                      Originally posted by masterpigeon View Post
                      I finally finished soldering all the sockets today, tested it and it works! The only problem is half of the keys don't work probably from corrosion. But besides that, it boots into the BASIC prompt with a cursor and lets me type.
                      Sounds good, now that the mainboard is sorted it will be much easier to solve the keyboard issues, which is why I suggested replacing the sockets first. Your problem could be just dirty contacts in the individual keys or open circuits in the scan rows and columns. That should be pretty simple to deduce from the schematic. To do it methodically, for every key that works locate its position in the scan array and mark its row and column as working. Before too long is will become apparent if any rows or columns in the scan array are faulty. Any key that doesnt work that is on a good row and column then the key itself is the problem.