Have to replace logic board - which i7s work?

My iMac failed to start suddenly; the boot chime occurs, but nothing appears on the screen. Tried PRAM and SMC resets. Verified its not just a backlight issue (flash light test, attempted to drive external monitor) or a graphics card issue (tested with new card from Apple), so I'm told that it's likely a logic board issue. (please chime in with other likely scenarios + diagnostics, though that's not my question).

A new board from Apple is too expensive (~$1100, and I'd purchase superior hardware and run Linux before I do that), so I'm thinking about purchasing one from a refurbishment outfit (~$400), but these typically do not have the CPU. I have an i5 in the current hardware (unknown if it is the problem, however).

If I do decide to purchase a board, I'd like to get the board for an i7, but the i7 series has progressed since the i7s that were for sale with this model.

Will all the newer i7s work?

Answer this question I have this problem too

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