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Roberto

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  1. I removed the ROM from its housing and the one in the picture is the result. I went through all the pins of the U * 8 chips very well including the neighboring ICs but unfortunately the problem was not solved. At this point I will have to replace something. You Bolle say you start replacing ALL U * 8 chips? Consider that the computer is fine and has no defects apart from that missing video area. When the operating system loads I can do everything (of course I have to guess the menus with the mouse to be able to select them), but it's just a video problem.
  2. I realized that I have duplicated the post. The first dates back to May 2019, here is the link: https://68kmla.org/forums/topic/57227-macintosh-se-30-display-half-screen/?tab=comments#comment-609705 Unfortunately I could not find it anymore (I remembered having posted it but I didn't remember if on this forum). If anyone gives me directions on how to behave to eliminate one and keep the other I would be grateful. Anyway looking at the suggestions of that post, just you Bolle, you told me to check UF8 and UG8 after cleaning the logic board and changing the capacitors. I have since changed the
  3. Hi Cheesestraws, I remember trying another analog card but it didn't fix the problem, so the problem is centered right on the logic card.
  4. Hi guys, I'm trying to restore my old Macintoshes and it seems that each of them has problems. Among these I also have a Macintosh SE 30 with a video problem. More precisely, I only see the bottom of the screen, that is, from the center to the bottom. The other half, the one from the center up, appears completely black. I've tried searching all over the web (including Larry Pina's Macintosh Repair and Upgrade Secrets book) but it seems this problem isn't common. In the book they talk about a similar problem but it specifies that the top does not appear black but collapsed on a horizontal line,
  5. I should change the title of this post to ... A Macintosh Plus with RAM problem symptoms (but it's not that and neither does the ROM). I tried to put both the ROMs of the good in the bad and vice versa and the screen of the bad macintosh has vertical lines (the good macintosh works well with the bad's roms). I think it's like you said bibility ...
  6. I actually miss this last test. I plan to run this test already today and report the results to you
  7. Hi bibilit, I was hoping you were the one to give me some help. I actually tried to put the two ROMs of the 'good' in the slots of the 'bad', but it didn't work. It must be said that the 'bad' is from 1986 and has different ROMs than the 'good' which is from 1985.
  8. Somehow the situation has changed. From my Macintosh Plus (the 'bad' one so to speak) I see alternate screens, similar as in the attachment, with some noise coming from the speaker. And here I stopped. Have any of you had a Plus with these symptoms?
  9. 1341 / 5000 Risultati della traduzione I have two Macintosh Plus, one fully functional, the other not (I will call the working Macintosh Plus 'good', while the non-working one I will call 'bad'). I state that the RAM banks of 'bad' have been tested on the logic board of 'good' and work. The operations that have been done on 'bad' are: Change capacitors C1 and c2 in the analog board, plus the replacement of the two RIFA (which generally have exploded). I went over all the critical p
  10. Thanks bibility, I changed the Optoisolator and it worked. Thanks to you too AndiS; now i have a more general idea about this problem.
  11. thanks, tomorrow I'll try to replace it with a card that I already have recovery. In fact I have tried the hd on another macintosh and it works perfectly.
  12. Thanks for your answer. Could you tell me where it is?
  13. I recently performed a recap of the capacitors of the analog card of my Macintosh Classic (the critical ones); all right for the first few seconds from power on: load the operating system correctly from HD Quantum 20 MB SCSI (the original Macintosh Classic to be clear). After a few minutes the HD starts to accelerate; you hear that the number of revolutions begin to increase until the system crashes. What could it be?
  14. I used isopropyl alcohol when I disassembled the drive for a more thorough cleaning but it never convinced me that this could be the cause of the problem. It looks like that damned disk brought the floppy drive head out of alignment. Generally this is possible, but only in the writing phase when a copy is being made from an image disc where the latter has been done bypassing the physical movement limits of the head. In fact, one should always check how the image copy of a disc was made (especially when we download files from the internet). But it is not my case since the burning software is na
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