Recent content by AppleWoz

Is there anyone who can explain to me why if I press the reset button nvram doesn't work? does it only work if the rom is loaded? the reset button works because if I press it I hear the speaker click, I really can't understand where the problem is and above all where I should look at this point...

that area is not shorted, everything is normal, there is something that does not allow the rom to ram loading phase

I have to check those two points if they are shorted, maybe the via chip ub5 is shorted

I compared all the connections between CPU ROM and BBU, everything is identical to the working motherboard, I tried to desolder the UK8 ram and in fact it gives me a ram error on the screen, if I look carefully however I see some small artefacts (dots arranged in vertical way), can you suggest...

I rechecked all the connections above and below the PCB, I found 2 connections missing but they didn't change the result, I tested the ROM on another board and it works without problems, I compared the board with a perfectly working one using a thermal imager and the same chips heat up in a...

the initial state of the card was really bad, the acid got everywhere, there are so many connections to check, but if you tell me that it can boot even without the audio chip and RTC, I'll focus on everything else by removing the chips again

I also removed the chips from the PCB because some contacts were missing underneath too obviously, I'll double check everything again at this point

Really? I didn't know that the classic booted even without RTC, I'll try to remove it seeing what condition it is in, thanks

I assume it is damaged because the Macintosh does not start and all the tracks seem to be restored and it is also completely delivered, I don't know if this information can help but I saw that by inserting the RAM expansion card this screen disappears and the checkered screen appears

I checked all the traces one by one comparing them with the good motherboard I have and they are ok, I think the RTC chip is shorted, is it possible to replicate it? I saw someone who did it for Macintosh SE30 later I'll add some better photos of the RTC, basically on one side it didn't have...

Hi all guys, this time with this classic Macintosh even after recap and track reconstruction it didn't go well for me, I'm having a problem with horizontal stripes, I don't hear any sound, obviously the analog board is working because I have another motherboard to try, this is the first time...