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Thanks! I'm really proud of it. :) The speaker was dead. I replaced it with another one from a dead analog board and it's fully working now. I definitely learned a ton about these machines, I even studied the Logic Board schematics. :cool: I'm able to repair any Macintosh Plus. I'm currently...

Major update: Macintosh Plus is working fine! :) After all it was ok since the beginning. :rolleyes: The problem was that since there was no startup bong, and the 4Mb RAM testing takes some seconds, I disconnected it before it ended the RAM test, to prevent "further damage". After...

Thanks for the suggestion. I've checked FDD connections and they're fine. Also tried to turn it on without the FDD connected, I think It should at least show an error message and the mouse pointer, right?

Hi! Thanks for the reference. I think Macintosh Pluses don't have a PRAM. I'm booting it without an RTC battery, as I don't have one and these machines operate normally without one. I'll buy new Logic Board capacitors and change them in order to rule out that those might be the problem. I'll...

Hi! Checked and double checked. The display is as stable and as sharp as it can be and no strange noises. Voltages stable at 5.00 V, 12.11 V and -12.10 V at external FDD port. Disk ejected, same result. No solder bolbs, everything clean and shinny. I've checked the clock signal at CPU pin 15...

Hi, After all, I was getting video, but the brightness potentiometer was on the low setting... my bad... :-\ When it turns on, the voltages at the FDD port are -12,14V +12,10 V and 5,01 V. There are no strange noises or hissing. It's completely silent. I don't get the turn on chime, neither...

Hi! Thanks for the reference. I'll check it, but since after deoxing the J4 cable and connecters I got 5V adjusting half way of the potentiometer and +12 / -12 are also well inside the normal range, I think those diodes are good. I'll keep posting my results.

[***UPDATED] to reflect that the voltages are correct after applying De-Ox on the J4 to Logic Board Cable. Hi! I reflowed the connector on the Logic Board, as it was also presenting some cracks, but it didn't solve the problem. My Mac passed the page 21 test on the "The Dead Mac Srolls", but...

Thanks for the reference. Didn't know this guide. I'll see if it can help.

Hi! I'm a newbie. I did a complete overhaul on my Macintosh Plus, including complete disassembly, cleaning, total analog board recap (kit from console5), floppy drive cleaning, lubrication and new eject gear. Also retro bright mouse, keyboard and case. It looks like new, but.... When I...