Definitely a board problem since it doesn't go away when you unplug the switch connectors. When were the batteries last changed? I only ask because the batteries can sometimes leak and cause trouble with the board. You may want to consider nvram or a remote battery pack at some point.

I don't necessarily think that has anything to do with your problem though. Had you done any work on the game recently before the problem occurred? Any problems with the game before this happened?

Think you should see the game to me!

Gotta admit, I'm not too familiar with this particular problem. I studied the schematics and did some googling etc and here's what I came up with so far: you'll want to use a multi-meter set to measure resistance and check all 3 of the 4.7k resistors at R5, R8, R83 and the 470 ohm resistors at R6, R7, and R82. They're labeled on the board. If they all check good, I would suspect possibly a bad 7402 chip at position 1F on the CPU board. I'm including a few pics to illustrate what I'm talking about. This one shows the schematic for the connector CN-14, and the resistors I'm suggesting to test: diagswitchcircuit (resized).JPG

This shows the location of the 7402 chip on the CPU (labeled LS02):
connectorandchip (resized).JPG
Hopefully someone with more knowledge of these games can chime in and help get you sorted out, but I'll try to help out in the meantime.

Well, to eliminate a software issue, turn off the game, pull the RAM chip from the main board (the IC under the 2 labeled EPROMs) and then reinstall it. Turn on the game. See if that clears it up.

If not, then it is a board problem.

Check the ICs for switch row and switch column with a logic probe, otherwise send board out for repair.

your batteries have been removed and a non volatile RAM put in place of the original.

your new RAM is at board position D5, under the new game ROM marked in pen SIMPSONS.

Also your original 2 game ROMS have been replaced with one.

A better video would help! Focus the camera on the display and don't move it. Keep the video rolling for 20 seconds.

After taking the video, do a factory reset and see if the issue reoccurs.

On another note, since you posted a partial picture of the power supply, there is more work needing to be done. CN1 and CN8 both look to have a burnt pin. So wiring needs to be repinned and the male headers connectors replaced. Also, the electrical splicing nut pointing to with the red arrow is not original to the game, so likely, more other things needing to be fixed properly.

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Your original RAM was replaced in the upgrade, look at the pics you posted, the repairer didn't reseat the RAM IC he replaced it altogether with one that doesn't require batteries to maintain game/book keeping settings.

No, your RAM is the one underneath the ROM labeled SIMPSONS, labeled NVRAM on the left hand side of the little circuit board in white ink.
There aren't multiple types of RAM on your cpu board, just the one, a 6264 CMOS original RAM at position 4-5 D which has been replaced as part of the upgrade to eliminate the need for batteries on the cpu board, a surface mount device (SMD) on a small circuit board.

nah, maybe it's me, i'm sorry i'm not helping here.

in post #11 where you put a blue square on the picture, you circled the ROM.

your new RAM is the IC underneath, notice in white print to the left of the RAM it shows NVRAM?
this is the IC to remove that will clear settings.
i'm not 100% familiar with NVRAM but my understanding is if you want to clear the RAM then put the IC on the ground plane so all RAM pins are grounded.

but the problem will be if/when you want to change any factory settings as the door switches are seen as closed.

have you confirmed the all switches (memory protect and service) in question work? like with using a multi meter check that the switch is actually open when it should be and closed when pressed?

At one point during all those audits scrolling through, it shows to press the start button. So press the start button. I ran into this before. Some reason the NVRAM must have a blank or corrupt spot and the software doesn't know how to handle it.

Even if the start button does clear it out, go into the adjustment menu to do the factory reset.

Probably only at a certain time did it actually accept smashing the start button. Keep us posted it if it happens again after a factory reset. So far, I hadn't had it return on the 3 or so games I had worked on when this had happened.

No.

The only way to clear it is to put it in something that can read/write to it (some eprom programmers can do this) and write either $00 or $FF to it.