Black Knight, NVRAM install

My Black Knight would not boot up correctly. It would power up and display 2500 4. I’d have to open the coin door and then quickly cycle the power switch and after a couple of tries, it booted up, but settings all back to factory. I couldn’t keep it on free play so I had a switch rigged up to the coin return (some previous owner drilled a hole in the cabinet and put in credit button). The guy I purchased it from was thinking a NVRAM chip would fix the issues… and a few years later I finally got around to giving it a go.  I purchased from https://nvram.weebly.com/

Got the board out, this is really pretty easy, wiring harness plugs wiggle right off and then a few screws and the board is free. Here is the failed chip that the NVRAM will replace.
The back side of the board. De soldiered as best I could and tried to work the failed chip free… however…
What is easiest is to use some fine pliers to cut the old chip out. Then with the little bit of leg that is left, pull on it with the pliers and reflow the soldier so the leg pulls out. Then use soldier wick to clean up everything.
The NVRAM I purchased came with sockets. Dropped right into place.
Soldiered the socket into place, pretty simple to do.
NVRAM chip inserted and the board mounted into the back box. This fixed the issue. I was finally able to set it to free play and it boots up as it should. Plus, never have to worry about battery rot.
Since this was a fairly easy project and have long term benefits, I see no reason to do most of my pins this way.

This write up lacks bit of detail. Mainly wanting to document what chip was replaced and the Black Knight 2400 4 issue. I’ve done this upgrade to my Earthshaker and have a few more photos there. If you have basis soldering skills, you can do this.