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I'm doing small incremental steps towards a functional 512k. I replaced R56 and R57 with new pots (2.5M ohm ones; 2M ohm were not available). Now the dimming of the whole picture does not happen anymore. I also replaced the LM324 on U1 as I thought it fixes the upwards shifted picture. I read...

There where no unsoldered pins when I received the machine. I took the photos while repairing it. Yes those pots R56+57 where probably affected by the leaky battery. R56 (brightness) is working again after cleaning but a little bit scratchy, R57 (focus, according to AB cover sheet) is still stuck.

It took me a while to replace the diodes in question. After that the machine bongs and I had a picture. But within minutes the brightness degraded up to a point where I could barely see the floppy icon. The brightness adjust knob worked while this happened. I think that machine is cursed in some...

The BOM of the Analog Board replica (https://github.com/daanvdl/Macintosh-Analogboard) lists a 4N35 as a correct part.

I tried a second time with another CRT/coil. It sparks again but now I spotted the area. It the diodes CR9, CR10 and especially CR11. Measuring CR11 i have throughput in both directions. As a diode it should be conducting only in one direction. I have to source a replacement and lets cross...

Could be that the CRT or coil is faulty/shorted and caused the burn marks in first place? I dont know what happened to the machine before. I'm sure I cannot power on the analog board without a connected CRT, which makes testing the AB difficult. I have another CRT/coil from a battery bombed...

I have an 512k Macintosh on the bench which I'm about to revive. I did not turn it on upon receiving the machine cause the analog board showed burn marks on the coil connector. I know this type of damage from my Plus but not that severe. I replaced the connector and the plug on the CRT...

I modded the PSU I got and can report success. Even with an 17 inch LCD Studio Display it works properly. Granted, the Cube has an SSD not an spinning harddrive, so the load on the PSU should be lower than normal.

In the end it was a grounding issue I believe. The upper part including the button was mechanical not connected to the base. Just plugged into the LB for testing. As soon as the metal touched the base it all worked as expected. So the metal top must be connected to the base in some ways to have...

I got a second Cube recently but unfortunately its missing the PSU. I want to build a replacement PSU and want to use a ready made one. I can order a 28V PSU which has a rating of up to 3.4Amps. This is around 100W. It should be enough to power a stock Cube, right? Granted, using it with an...

Could it be a similar problem I had with a SE/30 drive a while back? https://68kmla.org/bb/index.php?threads/blown-component-on-sony-mp-f75w.44807/ I tried running it without the eject motor, but this seem to kill a component (Q4) on the drives PCB.

Small but important update: It's not the CPU that is faulty. It must be the power switch. As soon as the power switch of the cube is connected to the logic board it powers on instantly, then flashes a few times and then power cycles. If I disconnect the power button module this does not happen...

Yes I want to make this machine totally silent with no moving parts other than the optical drive.

I reconfigured the CPU at 4.5 multiplier. But even then the Cube does nothing. The CPU is probably bad. Bummer.

I want to downgrade my new G4 Cube from a active cooled 1.2 GHz CPU to a stock configuration to make it fanless. I got myself a 466 MHz CPU card from an later Sawtooth I believe. To make it Cube-"compatible" I have to raise the CPUs multiplier from 3.5 (466 MHz = 133MHz bus * 3.5) to 4.5 or 5. I...

I got myself a replacement drive. Exact same model as mine. Much to my surprise this drive has the exact same problem. It does not recognize a inserted disc. It this a common fault with these drives?

Replacing the drive would be an option for sure. But compatible drives seems rare. As far as I know only the iMac G3 slot loading drives are compatible. And most of the iMacs came with CD drives not DVD. Writing discs on the Cube is not a priority for me. But if you are documenting fitting a...

I got myself a G4 Cube for a reasonable price. It has its problems I have to work on. One is a disc drive it was damaged in a way I never ever saw before. Someone managed to jam a floppy disk into the DVD drive. It was not visible from the outside. The only thing that was more than unusual is...

PM sent. :-)

Thats odd. The day I flashed my card the site did work. I have the file on my disk. I'll try to sent it to you via PM.