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I have now found a working LisaOS 2.0 German version. However, the problem is that this error message appears. In English: There is a problem with the internal hard disk. It is possible that it was not ready when the disk was started. Click on continue to restart Lisa. If you have further...

The C3 measures 10.1uF according to the multimeter, so it's OK. The only difference is now no LowESR....I don't really understand either.... Another question: I am looking for a LisaOS 3.1 in German. Unfortunately I haven't found one yet. I do have a LisaOS 2.0 in German, but unfortunately disk...

After installing the new Zener diode, I measured again and then noticed that 0V is still displayed. On the other board it was about 0.7V. So I looked for the only difference: The capacitor C3. After unsoldering the capacitor, the values of the diode fit and after installing another capacitor...

I have good news: The Lisa runs again like on the first day! Actually broken was the capacitor C3 (10uF), which I had renewed, but that was a LowESR. Apparently it does not get along with the rest in the 5V rail. The voltage regulator U1 and the diode CR1 are ok. Thanks for the great support...

I removed the U1 on both boards and then measured it, so the R2 could not have had any effect. I have ordered a new MC7824CT and then replace it. The BU406 has pretty much the same values as the new one. I have now measured all resistors, diodes and transistors and found that CR1 is defective...

Today I measured the transistors with my new multimeter and compared them with the working board. The U1 voltage regulator had completely different values on my board. 1.28V vs. 0.73V and 0.9V vs. 1.82V. So I think it is defective. Strangely enough, I was able to measure a clean 28V at point...

Thanks for the tips. I will check everything in the next few days and give feedback

Bad news...i replaced the BU406 but the videoboard is still "dead". I don't see any flash at startup or anything with high voltage.... Do you know which parts like to be broken or which are responsible for the high voltage? Maybe someone has a spare part for sale or can fix my board for money...

I ordered a new cable and now the ProFile works and I was also able to install LisaOS 3.1 cleanly. The ProFile was running for over 1 hr and there were no problems. Now I just need to fix my video board....

Yes, i did this before. I bought a new one and will test this today.

Hello stepleton and thank you for your reply. 1. I have not turned on the Lisa before cleaning and replacing the caps (precaution because expensive device). I have absolutely no high voltage, CRT remains completely dark. However, the cathode lights up. I measured and compared the resistances...

Hello all, I am a proud owner of an Apple Lisa 2/Macintosh XL since 2 months. Before turning it on for the first time, I replaced ALL the capacitors. Now I have the following problems: 1. no video, CRT completely dark. I got a videoboard sent to me by another collector, with this it works...