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Found 14 results

  1. First, I'd like to thank @ttb, @aeberbach and others who contributed to my separate thread on SE/30 SONY Chip Voltages. The conclusion of that thread is that while most of the 47uF capacitors on the motherboard see only 5v, there are 4 which see about 12V. That is actually a problem for those 4 capacitors. I know that many people, myself included, recap very often with Solid Tantalum capacitors, myself having used 16V rated parts in the past. But there are important reasons why we need to stop using those 16V rated "solid" tantalums on the SE/30 motherboard, despite the fact that most of y
  2. I've been having A/V problems for some time now, I asked people on r/VintageApple and they said I should recap logic board. I already replaced all cylindrical capacitors on the analog board and a professional replaced the capacitors on the logic board, but alas, there wasn't any change, I still get this checkerboard on startup and there's no sound at all (except some occasional faint screeches). I am getting really desperate for solutions because this is a very specific problem that has not been (probably) documented yet. I really want to make my Mac Plus work again, but anything I've tried di
  3. Normally connecting a Mac Classic (working) logic board to only its Molex connector (so no ram card, no floppy, no disk), it starts with sound and showing the floppy with question mark on the screen. Now, I'd like to know which components of LB are (not) participating in this phase in order to concentrate on them (or exclude them) in my tests to understand why it does not start. Thanks for suggestions.
  4. Hello everyone, I'm currently working on a Power Macintosh emulation project called DingusPPC. Our current goal is to create a virtual software model of the Gossamer HW, that is, an emulator of the Power Macintosh G3. I need high-resolution pictures of the Beige G3 logic board (Desktop or All-in-one). The areas of my interest are as follows: the Heathrow I/O controller and ICs around it ICs near the monitor and Ethernet connectors It would be nice to have clearly readable IC markings. Thank you in advance!
  5. Hello, I have a Macintosh Plus that have 2 problem: The Analog board only provide 9.4V measured on the connector on the Analog board side (Same on the J8 from the Logic board). All the connector have been soldered (with new solder past). The board had bad corrosion traces but I did measured all connection with an ohmmeter and they all seems to be fine -> I will probably need to change the 12V 5W Zener diode to solve the first issue. (I guess). I know that the Analog board has an issue because I tested it with a known good logic board and I had the same issue (9.4V inste
  6. OK if you have seen my post about my CRT issue you know that it has a strange problem. But when i was messing around it seems i broke a rom chip and now my logic board is mostly inactive! After putting in a disk it spun up for about 2 seconds and then cut off. I decided to check my rom chips and see if had put them in wrong. But when i switched them it just made a loud sound as if i made a remix of the Macintosh pluses startup sound. 3rd times the charm right? Well no, its not, in fact i found that a leg broke off of the LO rom. So i think that getting a new logic board will fix this? Al
  7. I am starting this thread to see if there is some possibility of getting my two SE/30 motherboards repaired or replaced. In 2012, I went through my collection and realized I had two SE/30 logic boards which showed the Horizontal Lines (Simasimac) at cold boot. Those lines were stable on-screen and would display forever, meaning the SE/30 would never boot. Prior to 2012, I had recapped both boards but found they both had identical Simasimac symptoms. The two boards were recapped at different times, one being one of the very first SE/30 logic boards I ever recapped -- I used elect
  8. Hi! I’m totally new to this forum and new to the vintage Mac scene, but I love all things retro and when someone gave me a Macintosh color classic to try to fix, I was super excited! The machine turns on (I hear the fan) and emits three monotone beeps. Not the chimes of death, but something I can’t figure out. I busted out the logic board, and wow. There was some serious corrosion. I tried to clean it up with some isopropyl alcohol and cotton balls, but some resistors totally fell off and I can see connectors that are completely worn through. I’ve attached some photos. What should I do? I only
  9. I purchased this board and if all goes well, I will have it on hand to analyze with more precision but in the meantime I am asking you what your take is on two details. 1) The jumper wire spanning 3 chips, what might account for this jumper? 2) A blotched area on the board? [UD8] NOTE: in one of the images I marked the questionable area in read inside the yellow frame. 3) Does Q3 look ok? What is that component and is it there or missing? What I do know, the caps were leaking but on request the board was cleaned up so that while it ships, if it continues to le
  10. Hi all, I had an SE/30 board recapped by MacCaps. Originally, board was no boot/no audio whatsoever. It has made progress since being cleaned and recapped, audio now works. However, I'm still left with this as a result: The startup chime is messed up, you can hear it in the following Youtube video: https://youtu.be/D_z18h5slp8 What has been done so far is the following: *Tested with three different SE/30 ROMs (2 known good, and 1 from this specific unit) *Tested with several different combinations of RAM. Since in my possession after recapping I have personally tried
  11. So now that I've gotten my hands on a Macintosh SE/30 to fix up, I went and checked the seller's conclusion on what was wrong it. According to him, the CRT wouldn't come on, and he suspected the analog board. To put that theory to the test, I swapped boards between my working SE, and the SE/30. The SE in the SE/30 chassis booted, and was happily driving the CRT. Thus, the issue was not with the SE/30 analog board or CRT. And to be expected, the SE/30 totally failed to boot in the SE chassis. The seller thought the SE/30 didn't chime because the speaker cable wasn't plugged in, but his memory f
  12. Does anyone know the pinout of the mac plus logic board to analog board cable? I was wondering if it used black and white composite video.
  13. From the album: Macintosh SE/30

  14. Thanks to a generous heart here at the forum, I'm getting a IIsi board to replace the one with the death chimes. If he wants to let himself know, that's up to him but I greatly appreciate it a lot. But back to this board, before the recap it was dead, does not turn on, nothing. It's "twin" I successfully recapped and it works. But this one was brought back to a Zombie Life- it turns on and then Death Chimes. Considering neither board was dead, it is great to see some life in them. As I wait for the donated board to arrive, I decided to put on my high powered magnification glasses - a m
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