It's not a game setting, it's the default behavior of Embryon software.

Are you sure you've got Embryon correctly selected on the Alltek game selection switches?
Did you try running the Alltek memory clear function?
The Alltek CLK speed jumpers are selected for Bally and not Stern?

Quite possible.
What happens in game over mode on the displays? It should:
1) Show the last game scores
2) Blank
3) Show the High Score to Date
4) Blank
Repeat

Do the displays momentarily blank at 2) and 4) ?

Have you got a factory 6 digit display to try with the 7volution controller board disconnected?

Looks like they might need to update the firmware on their controller interface board.

It's really quite strange why Embryon was released with 6 digit displays, when nine months earlier Bally already made the change to 7 digit games.

Contact X-Pin. The 7volution product is their proprietary design and only they'll be able to resolve it.

Hmm, this looks like an error in their logic detection, not an electrical issue.

All the below 6 digit games flash the player up score at the start of a ball. Shouldn't be hard for them to find one of these..

Kiss, Dolly Parton, Harlem Globe Trotters, Silverball Mania, Future Spa, Space Invaders, Rolling Stones, Paragon, Mystic, Hot Doggin, Viking, Embryon, Six Million Dollar Man.

Also check the 5 volt loop wire on the J3 connector at solenoid driver board pins 13 and 25 that powers the solenoid drive circuits.

That would be a shame.

X-Pin are on Pinside if you want to try PMing them:
https://pinside.com/pinball/forum/topic/xpin-black-friday-sale-2021-1

They've also partnered with Big-Daddy, so they could be another contact route.

Olivers Embryon update isn't in the Alltek ROM.

I presume you're also monitoring the lamp states so you know when to display the high score to date, etc.

There is no situation where the singles digit will be blank and other digits will have live numbers. Same goes for the 10's digit.
So if either of those two digits are blank at a display, that whole display will be blank. i.e. you don't need to worry that the score has rolled over and you have to stuff zero digits up to the millions digit when those first two digits are blank.

Since the MPU board writes digits to the displays in reverse order (most significant to least significant) there are likely times your blanking will be out a frame or so but we are talking some milliseconds which nobody should notice.

The Stern MPU-100 games with 6 digits write to the displays the same way Bally does.
The Stern MPU-200 games have a faster display interrupt generator that runs at 400Hz.
Alltek MPU boards run the display interrupt generator at 420Hz from memory, regardless of 6 or 7 digit games - they defaulted to Ballys 7-digit refresh speed.

Are the flippers dying aswell?

If yes, also check the 5V power loopback (brown-green) wire on the solenoid driver board J3 connector - if wiggling it makes the solenoids work, time to reterminate with new crimps. Measuring test point TP3 on the solenoid driver board should indicate 5 volts.

SDB_LogicPowerA.png