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T1 (The flyback transformer) is powered by several components: Q1, C1, L1, and I think Q2. I would check the voltage leading to these parts. Is there voltage going into the logic board? Sounds to me that the Power Supply Part failed due to battery leak and not the video section failed.

Looks Fine to me. Interesting, you have the newer 2 ROM Chip version; I have the earlier 4 Chip version. I thought you were talking about the ROM Slot on the side of the logic board. The only thing for that I remember is a FPU Upgrade made by forum members Parallel and Alaska360. Talk to them...

There are major differences between the IIc and the IIc+. And there are 2 versions of the IIc itself. The biggest is the PSU. In the IIc+, the Power supply is internal to the IIc+ and plugs into the wall directly. The IIc has a simple step down transformer to bring 120VAC down to 12V DC, and...

You mean an FDHD upgrade kit for the Mac II? No, I believe it should not. Reason being is that the II uses a '020 CPU and the IIx uses a '030 CPU. There are some differences at this point, even if one uses the PMMU.

You're right but that is why I posted what I posted in my last post about it being the equation to the problem. It seems going along with Anomous Freak's post is that some macs support this and some don't. My findings: It does not work on my IIfx or SE\30. On rebooting, the Machine goes...

The only thing left as per this "new" evidence, is cap goo trace rot leading to the NUBUS slots. The other possibility is the MMU. In a worst case scenerio you can run the Mac II as a headless server. You need to set to the System on its drive on a separate machine and have. and set up...

I could not agree with you any more. Just because one does not have racing skills when we get behind the wheel and drive our cars does not make us bad drivers, even professional drivers as in cab/taxi, trucks and emergency services driving. People do not need to know how to solder to diagnose...

The 700 series also has this same connector - but it is IDE. Its the damn connector that is Proprietary. You can break that case open and swap the drive, as that connector has a ribbon that goes to the hard drive's IDE Port; it is not part of the hard drive as he stated. I've taken many of these...

Gorgonops is correct. A lot of times to make a shipment, for schools systems are slapped to make a complete machine set up, and keyboards and mice did not matter as long as they worked. A school ordering 500 machines will have a few odd ball systems. Some of the stranger ones I seen are the...

2 Things. 1) Like Macdrone stated, the cas on the video board goes bad and they too need replacing. The II and IIfx usually have tantalium caps for the most part..So it Bongs and Chimes as it should. You are ahead of the game on this. 2) You did not mention what kind of Monitor you have...

Some later versions of the LC and LC II came with that keyboard. Oddly, the students in school would swap keyboards because to them it felt better than the other LC keyboard that was out.

THAT(!!!) Is the Equation to the problem!

Lets go to step 2: Getting it fixed. Get a magnifying glass and look at the area above the SIMM Sockets. See if they have been rotted out. Fix what you can. The board is almost there but it is one or two wires that have rotted part way and finally failed. Got to go through this with a fine...

First off, lets get this puppy howling and diagnose each part as we go along. 1 - take that IIcx apart, and remove any hacks you have on it, e: The ROM-inator. 2 - assemble the IIcx back as a stock machine. Set it up with 16MB if RAM and a single bootable (I assume its the 7.5) drive. 3 -...

True, Unity; 90% of PSU issues are with the startup circuit of the board and other shorted caps.Recapping the board will bring back a PSU one thought it was dead. But I do have two blown PSUs from the two IIcx's I own.  Money is tight on my end, so recapping a board and getting a new PSU have...

Let me ask you this - and I really want you to think about this really hard... How is this RAM Disk is being created? It is an actual separate hardware device like this little guy? http://micha.freeshell.org/ramdisk/ Or is it software. as in it was created with Control Panel -> Memory...

Ah yes. The 5300, an excellent machine for its time, despite its negatives. Still own my 5300ce I had since the 1990s and picked up two 190s along the way. With a CF-to-PCMCIA adapter of a large enough PCMCIA Flash RAM Card, you can build a back up drive for it, and with a CF to IDE Adapter you...

How much RAM is in the IIcx? For 7.5 wants a minimum of 16megs. What extensions are you running on it? Have you booted holding down the Shift Key for "Extensions Off?"

That's it, a blue screen? No video, no raster, no icon, no boot screen? I would agree with TechKnight on a rotted trace by a cap. Here is a trick I learned from the Arcade Machine Restoration people - use a black UV Light and look at the traces with a magnifying glass. The traces will "glow"...

In this case with these symptoms, no. Is the Internal a Quantum Fireball drive? If it is, the rubber head stopper is turning into goo and the head armature is stuck on it. There are ways to fix that but that means opening up the drive. Time to go to Solid state with SD2SCSI or CF2SCSI and get...