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that screen looks like tunnelvision syndrome on a color display

the way it looks to me, is one of the caps ate away a trace/via. you are missing a signal to one of the buffer/driver ICs. gotta chase that down and fix it. Or, you can order a NOS screen out of the UK.

youll be lucky if it arrives in one piece. these 5XXX machines are peanut brittle.

me and @androda are working on newer design which contains readily available chips, which unfortunately are BGA. Good news is, its a single-chip RAM solution which simplifies the select/decode logic.

sounds like the PMGR died. might need to isolate and control those lines seperately just to see, but youll get a CD34/CD36 sad mac regardless.

You would need a platter removal tool.

Im sure you can find a chinese company to do it, but it would probably take a massive order to justify the cost

The only fix is to custom manufacture new LCD panels, or retrofit modern ones in their place with some type of standards converter. First is expensive as hell, 2nd might be feasible .

There was a chart on the web that had all of these... It used to be on maccaps but i think that site has since died, and with it, all of the data.

Slow chimes. Can't see the RAM properly. Could be the 253s, or broken traces

Nah i haven't come back to this thread yet until now, been busy. And no, I have not as I am typically on my mobile more often these days.

Flybacks are part of a tuned-circuit and help sweep the beam across the tube, if they dont match the original circuit they were designed for, it wont work properly. Flybacks also produce secondary scan supply voltages, which the entire circuit surrounding it is engineered around. So flyback...

nvm I got it. just, imgur on a mobile device is absolute trash. had to bounce back to my PC

I need to know what resistor values are on the little tiny circuit board because one is missing on mine

That m4a does not open on my phone, so I will have to look at it later

Hit it with a bulk tape eraser. Then it will work fine. magnetic media builds residual magnetism from the earth and other nearby things, and floppy drives cannot change the magnetic flux between tracks, and this will distort what is being read/written to in the tracks. When you hit it with a...

This is a perfect situation to grab yourself a can of freeze spray. While its warmed up, hit each component one at a time with a can of freeze spray and see if the behavior returns. Whichever component returns the behavior is the bad one. Start with diodes/transistors.

Obviously. I am talking about if you do a redesigned hybrid, how are you going to get 5V out to run the rest of the machine? A patch wire. of course. Trying to avoid that... You could use the gate control wire to feed it down but that's not a good option ether because thats an awful small...

The drive to the gate of that MOSFET is not PWM. That regulator is very much a linear series-pass setup. If there is anything other than a voltage there, then there is something very wrong, such as it has gone into an oscillation.

The community is going to be divided in this way. youll have the people who want big patch wires running all over their boards for a "replacement redesign" and you are going to have people who want to keep things as original as they can, but also working.