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Update. Tried different peripherals and the board is working. This was the issue on all three boards. Funny thing is the peripherals worked with 800k. boards. At least it is solved. Thank you.

Same keyboard and mouse that I've been running with both boards. Yes, this is strange. I just got another FDHD to work on and this board acted the same way as the previous two that I pulled out of storage after having this issue. This is the first post I've made because I had not thought of...

I have three different SE FDHDs that I have been refurbishing over the years and noticed that they all suffer from the same problem. After successfully booting to desktop and running for a short time (5 - 10 minutes) they will all end up freezing with a person unable to move the mouse or use...

Hello all, I'm recapping three Mac 128k analog boards. I took the easy path and ordered the cap kits from Console 5. I am on the 2nd board and noticed that the old C6 (22uF 50V) cap has a resistor attached to it. The other two boards did not have the resistor attached and the old capacitor...

Thanks for all you help. I got both 128ks back up and running. Replaced all the chips (new are socketed) on the multiple failure board and a single one on the other. Now I have another project with a 040038 sad Mac code. I believe this to be a bad RAM chip at G7? If this is incorrect, I...

Appreciate it, many thanks.

dochilli, thanks for your help! Yes, I was planning on changing them out as a start. Always wanting to learn, can you direct me to where these nuggets of information are revealed for future reference? Thanks again

Hello all, I have two 128k boards that I’m working on. The first will bong on startup with SadMac 04919A. 04 = Memory Test-Mod3 test and identifies a bad chip or chips. A sub code of 000A sub code meaning is Line 1111 (I don’t understand what that means). Also, I don’t understand the...

Nice! I’ll give it a try.

Thanks for the input, here are some pictures. However, so many chips and so many traces. I’ll have to search for a new card probably.

Hello all, I have a Mac IIfx that has been recapped with an Apple 630-4222/630-4230 high resolution display video card installed that has also been recapped. The computer runs fine. I am using an apple color plus 14” display (M1787) and getting vertical lines on the screen. I know the...

Update one this. I actually found the tiny transistor in the bottom of the case. I soaked it in IPA, cleaned it up and soldered it back in place. Mac IIci is up and running again. Thank you community for all the information.

Thanks for all your help and also the clarification between the “Q” and “D”, I will order one up and get this fixed. I appreciate it.

Recapping another IIci board and noticed that one of the small black diodes is missing from Q3. I assume it is the same diode that is on D3, D4, D5? I need to purchase a replacement, but haven’t figured out what to purchase. Any help would be appreciated. I have attached some pictures for...

Appreciate it, I’ll take a look.

Thanks for the information, I appreciate it. Where would I find the start up circuit? I apologize about my lack of knowledge in advance.

I have had a project IIci for quite some time. I recapped it and ran it through the ultrasonic cleaner; the board looks very clean. When I go to start it, I simply get a click; either from the soft start on the keyboard or the power button. I figured it was a bad PSU, since they seem to go...

Okay, I can verify that this part from Digikey is a correct replacement part for the inductor above. RLB0913-4R7K-ND

I actually have one coming tomorrow, so I am planning on learning how to use it quickly! I will start with resistors/diodes and move on from there.

I've been following this thread along with others on the IIsi PSU. I have four IIsi PSUs that I've been working on over the last month. Three are Sony models and one is a MagneTek. I have recapped them all (along with the daughter boards) and have one Sony working and the MagneTek working...