My previous post, about Cocktail #1, clearly documents the “easy one.” This second one is gonna be another story. It has a very dead monitor, and a non-functional board. I have not yet benched the monitor, but it has no neck glow, which is never a good sign.
The board has problems, but at least I know it is not the CPU as I already swapped it, and I know that it is not a power problem on the second Cocktail, because the board has the same behavior in Cocktail #1.
Swapped all socketed chips to no effect — they all work on the other board. Power points seemed right on the board, but I put it into my working cabinet to verify… and while doing so I managed to cross GND with a +5v trace and smoked R30 quite nicely on my AR-II board.
I have replaced it, but am still getting voltages that are too high. Gonna have to hunt other likley suspects…
As far as the board goes, I am gonna have to break out the Fluke 9010 to work on this one… Right after building an adapter for it so I cam power it up on the bench.
The monitor I should know more about once I have it on the bench and take a good look at it while I am capping it (and doing the sync upgrade).
Turns out that this one had a cracked flyback. I ordered a replacement kit (flyback and caps) from The Real Bob Roberts and replaced the flyback (my first flyback replacement!). Have not yet put it back into the game and fired it up, though. Maybe after winter…