Hey everyone, hope you're having a good day.

I'm less than a month into pinball ownership and have been fixing up a Harlem I picked up in great condition, but last night while I was playing, the displays went dark and GI stayed on, and the game stopped functioning. Everything seems to be getting power, but upon boot, the MPU gives 2 flashes.

From my searches of the forum, I see people suggesting that this points to a bad U8 or U12 chip or connection with one of them to the board. My question is, with no spare chips to swap in to test, what should my next steps of diagnosis be?

I've stuck a picture of the board in question on this post, from what I can tell there's little to no corrosion and a battery mod installed by a prior owner.

Thanks very much for your help!

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Thanks for everyone's help! After long shipping waits, I ended up going with what I thought was the safe choice and replacing U7, and replacing U8 with a 5101 nvram upgrade. Desoldered the battery but haven't removed it yet. Problem is, now I'm getting no flicker and no flashes, just a solid light on the MPU. Any suggestions?

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You're probably right, sorry, I'm pretty new to the insides of a game. I pulled the nvram and turned it on and got the same result, solid light.