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Correct, battery is not needed to post. Not sure how you select video mode (MDA,CGA, VGA) , if its soft set with the FE2010A.

No doubt you have checked your work, but it may be worth checking those resistor solder points with a multimeter to make sure their is continuity from there to where the tracks go. Also those DIP sockets don't look the best, the fact that it does not beep at all would make me want to check the...

Yes and it's a more desirable keyboard . I suppose you need to findout if keyboard is holding reset low or shorting 5v down maybe isolate the reset pin( or wire) and see if amiga comes up And measure for shorts across caps , or across 5v snd ground pins 1 DATA 2 CLOCK 3 RESET 4 +5V 5 key...

Could you swap the pcb and cable for one of the working ones , or are they different style/manufacturer keyboards?

Could keyboard is connected wrong way round , or maybe the reset is being held ?

From the Dead Mac Scrolls lol

There are caps that can fail inside the keyboard too, and components that can corrode

Sorry I ment more like this here but for that flyback you got Just an example https://m.donberg.ie/descript/h/hr_7807.htm

Yep, I gathered that , it's a pity https://hrdiemen.com/ is down . That may have the schematic of the flyback . I've searched webarchive and Google cache with no hits.

Better and much worse, there should be no connection at all between 1 and 5 for a start . Not to mention the rest .

Damn, unless they are rectified coil output , have you tried a diode test across the pins either way, it's the wrong coil anyway but might explain why you are not getting continuity and may explain the cap popping

That makes no sense to me, even if it's the wrong coil they should not be the same. I can send you a tested flyback if you want

Just to confirm you have the correct flyback by resistance between pins. in Ohms Low side: Total ohms: pins 2 to 4: 0.30 = 4,3 + 3,1 +1,2 High side: Total ohms: pins 5 to 7: 3.50 = 5,8 + 8,7 Pin 6 is not connected. I found the older flyback has lower resistance, but the rule...

You are quite right, That's what it says in the Service source, i have not encountered an issue in real live though. Currently running my 8100/100 without a video card or terminator, that the link above shows my one going to flashing floppy as such.

The mac has sense pins on its monitor connections, it knows there is nothing there so will initialise nubus if monitors is connected there. HPV is not required.

Have you tried resetting after powerup? if the battery is flat or not present you just get black screen after bong, so the reset is necessary if the machine was off for a length of time. See here:

Did a little disassembly on the Apple 5.25" PC Drive and it turns out its a near standard Panasonic JU-455-5 360K floppy drive. Pinout attached. Drive is set at DS0. Booting SoftPC using a Gotek Floppy emulator connected to the PC Drive Card.