mattsaloeltjen Posted March 27 Report Share Posted March 27 I'm just going to list what I have done and symptoms. Checkerboard screen Replaced caps on logic board cleaned logic board- as best i could Reflow some joints Verify 5 and 12 volts within range At this point I got rid of the checkerboard screen, Now Will not boot from hard drive Will not boot from floppy Will boot from on board rom by pressing the 4 keys Never hear any audio, at any point through any process When booted from rom it will not see either drive HD Spins up and sounds normal Floppy spin a disk for 1 second then nothing. Will periodically reboot while it's booted into the rom Remove 1 or both drives from logic board has no effect still will not see either drive. At a loss where to go from here, I'm leaning toward the power supply. Quote Link to post Share on other sites
68kMLA Supporter joshc Posted March 27 68kMLA Supporter Report Share Posted March 27 (edited) Welcome to the forum. Post good quality photos of your logic board please, we might be able to spot something causing some issues. If it's not squeaky clean, I would retry cleaning the board to get it that way. Do you know that the hard drive and floppy drive are good? Have you got spares to test with? The hard drives in these are usually dead at this point (spinning up doesn't mean it will work). Have you recapped the analog board yet? I've never seen a Classic without capacitor leakage on its analog board yet. The cluster of caps next to the speaker tend to be the worst. Edited March 27 by joshc Quote Link to post Share on other sites
mattsaloeltjen Posted March 27 Author Report Share Posted March 27 Thanks for the reply Caps on analog board look good, I will cap it next weekend to be sure. I do not have the correct values here now. Pictures attached I know the battery section needs work yet. Parts on order. Any other ideas? Quote Link to post Share on other sites
mattsaloeltjen Posted April 3 Author Report Share Posted April 3 So I have recapped the analog board, This fixed the random reboot problem. Seems to function better over all. Still no HDD or Floppy drive show up on the desktop. Boots fine every time now, but only from the ROM boot. I'm thinking this is a controller problem on the logic board. What chip is the disk controller? Quote Link to post Share on other sites
68kMLA Supporter PotatoFi Posted April 5 68kMLA Supporter Report Share Posted April 5 Your logic board doesn't look very clean. Scrub it with Isopropyl Alcohol and a toothbrush. Sometimes I even scrub them with dish soap and water. Either way, I take it straight out to the garage, and blast the board with the air compressor to get every drop of moisture off of it, and then I let it dry for 24 hours. I have a guide/build log here that might help. Quote Link to post Share on other sites
mattsaloeltjen Posted April 6 Author Report Share Posted April 6 Thanks for the responses, Update. Still cleaning the board and reflowing joints. Two things still bother me. 1 Floppy drive has power and spins when I put a disk in. But never shows up on the desktop. 2 No sound at all, ever. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.