Recent content by pinto_guy

Ha, Monitors somehow was not enabled in my control panel. So the verdict is in: 640x480

I checked all over the control panel, but could not find out the screen resolution of my system. I'd be happy to do it if you tell me how to do this.

What's also weird is that the ROM does not tell you anything. In the compact Macs, when the RAM is faulty, a death chime is heard, with a sad Mac showing an error code. Here, you're in complete darkness, so to speak, and left guessing what's really happening.

Well, I'm a bit embarrassed to say that in the end, it was one of the two 8MB RAM modules (or both): I plugged in the 32MB one that came with the replacement 6300CD board, and it worked like a charm. I lightly sanded the contacts of the 8MB ones, reseated them, and it did not help. So I went...

Well, happy to report that my system works with the spare eBay LB that I just received. So in the end, it was not an issue with the PS, the HDD or the AB. This tells us that both the HDD and the AB wait for an "All clear" signal from the LB before firing the CRT and booting up. Also noteworthy...

So I went ahead and disassembled both PS and AB. It's a bit involved, but not as difficult as I thought it would be. There was quite a bit of dirt and dead bugs everywhere. One connector was (I thought) a bit loose, and I was really hopeful that was the problem. One power transistor on the AB...

Assuming my PS is OK (which seems to be the case), I see 3 possibilities 1) AB and LB are decoupled, and LB can boot up without a good screen, like it is for all compact Macs 2) AB needs an OK from the LB before firing up the CRT 3) LB needs an OK from the AB before booting up It would really...

I thought about an analog board issue. But would this prevent the boot process from proceeding ? Again, the system is just not accessing the HDD, FDD, or the CD (I tried booting with a system floppy and a system CD). In compact Macs, the analog board or CRT could be completely toast, but the...

Yes, 5V and 12V right on the money (from HDD molex) Yes, health chime followed with some HDD noise (self test at startup) Nothing after the chime No. When it was still working, I could hear a CRT thump after the boot chime. Now, the CRT remains silent and dark. With a compact Mac, the CRT...

I cleaned out the contacts on the board itself, but will look in as well. By the way, I'm not sure if it has anything to do with it, but the screen went blank after I connected a Color Stylewriter 1500 to the LB. Not sure if it was right upon connecting, or later on, as I was busy checking the...

Yes I also checked, and there is hardly any corrosion around the battery. I removed the Velcro backing and spent 30mn inspecting all the traces, and I see nothing suspicious I had a few 3.6V PRAM batteries for the Mac SE (1/2 AA) that have 3.6V. My understanding is that as long as it's >3V, it...

Thanks. I mostly know compact macs that still show a display when the HDD is toast, with a flashing question mark Mac. Do I understand that the 52xx Macs do not show a screen when the HDD is dead ? And would it boot with a system floppy ? A dead HDD had crossed my mind, so I disconnected it and...

I got a 5260/120 from CL yesterday for $30. Came with Stylewriter 1500, modem etc.. After cleanup, fixing the FDD and cleaning some faulty extensions, I got it to work. Alas, after a day or so, it froze and the screen went blank, and not I cannot get it to boot any longer. The PS is OK (5 and...

Thanks Corey. I had posted something similar 3 years ago on the Lisalist forum. I used an OPL560 IR sensor which did the trick. Recently, I also had a similar problem with the track zero interrupt sensor of an ST-506 disk drive in a 5MB Profile. See here. In that case, the IR emitter was...

Thanks Brooklyn. I usually don't check resistors that do not look burnt, but becoming desperate, I did. One of the resistors feeding TDA1170 (R28) showed 470 kOhms when it should be only 56k. After a quick replacement, I got the problem fixed. R28 is actually next to C18 on the board which I...