After the Retroleum test rom diagnosed the newly fitted ic15 as still the fault on the Spectrum practice board, I took it back to the Spectrum4Ever Facebook group and Mark Fixes stuff. Brendan Alford offered up his test rom available at to try in the Retroleum which looked like this when testing.

Retroleum test with Brendan Alford test rom:

So IC22 looks like the culprit now. Soldering iron warmed, ic removed, socket fitted and new IC fitted, powered on and got weird patterns, not good. A quick check found some solder splash bridging pins on the board, cleaned off andcthe test rom now did this

It even played a game now 😀

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