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I would totally be over this, but I have 0 interest in Apple IIs :D

Since July 4th: I achieve solid control of the soft power mechanism. I soldered a wire between 2 ground loops underneath the logic board like so: As you can see in the picture, there are 4 of these "rings" total on this LC550 logic board. I soldered a wire to bring them all galvanically...

Things I've tried in the past 2 weeks: -Mess with PP1 and PP7 (I know I shouldn't have!) to bring them back closer to their original orientation based on photos I took early on. PP1 is left a smidge under 5.00 V. -Test the continuity between ground loop-ring things underneath the logic board...

We can't really judge that. The Amiga footage is based on my capture of the WinUAE emulator and its exact speed is dependent on cpu sliders in the options. The Mac version had no sound. Which makes sense, because the freeform wave synth of the Mac plus takes a sizeable chunk of cpu usage %

I'm wondering if this is a possibility if I get desperate, can a LCIII's chip be used as a swap in for the LC550's? It's the closest mac I have to it in terms of technology and it's in pretty bad battery bombed recovery shape as it is anyway

Ok, I used this pinout (ADB socket on the back of the logic board) soldered wires directly on the Apple CUDA 341S0788. pin14 = GND (could have used so many other points but whatever) pin25 = PS_ON pin. Continuity to either of those went correctly on the socket at the back. NEW BEHAVIOR...

Further work done: -Recap the rest of WHOLE DANG analog board (ie 100% of the console5 kit) no change -Clean the CUDA chip (responsible for ADB and soft power) no change Dismount the analog board, the main computer cage and metal shield to see if some piece of the snap in the case was...

I seemed to have made some partial progress. I cleaned the CUDA chip some more with alcohol (lc550 board, it's not the egret chip since I don't have a stock CC1 MB). I heard death chimes for the first time in a loooong while! I experimented with board insertion at slightly different angles...

I live in a non-US country (Canada) and I can see the site just fine

This video was very illuminating and gives me hope of maybe finding a silver bullet to my 'ramping up, ramping down' (timestamp around the area where he explains the switching part):

So I was able to spend some time today on the analog board: Replaced DL21 and DL22 with these: 1300mW, 5%, Small Signal Zener Diode Replaced both optocouplers CNY75GB with these CNY75B Noticed the sad state of the pins for the edge connector: so I solder wicked all of that out...

Live 9PM EST - Let's progress on a fresh game together in The Fool's Errand (1987), a classic black and white game for the old compact Macs. Straight live capture from my real Mac Plus. Shout puzzle answers at me in the chat while I struggle! It'll be fun! (now fixed, first link was bad, this...

After cleaning pin 1 just a bit, a chunk fell off: poor diode's probably not receiving enough juice, maybe?

Hmm, guess I'm in the market for a new optocoupler maybe. but I'll want to test it out first.

I'm going back to inspecting the analog board. Here are the edge connectors on the AB side, the large ones seem fine: The small ones are looking like this mostly (80% of them): The end near towards the transformers are a little bent towards the bottom and one pin is slightly crusty: Is...

Do you have any more updates on this @jcm-1 ? I'm thinking my problems with my CCII might be board edge connector related. Here's my recent thread about it: https://tinkerdifferent.com/threads/mu0ns-color-classic-thread.1252/post-9567

State A: the state as I received the machine initially (plugged: logic, back of the case, hard disk, floppy) Flick the power switch on, press soft power on the keyboard - get a brief led flash, then nothing. State B: worked for a few days, but required plugged in prep HOURS (plugged: logic...

I put the diode back, replaced these notorious caps: and put it back together (no, I didn't forget the ground cable by the screen) and I get back the same behavior as before this recap push: -Flick the switch on, hear a brief, soft, high pitch sound -Soft power button does nothing -Back to...

I've taken one out: Diode mode: forward: 727 - increasing towards 1000 reverse: 1 Resistance mode: forward: 648kOhm reverse: inf

Hmm, can't find the exact type of diode here: https://colourclassicfaq.com/tech/ccparts.html GONNA DO IT and test out of circuit