White Screen (Basic troubleshooting already done)

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This could be caused by multiple things. We recently had another builder experience a similar problem. I told him to try this, and it fixed it for him.

"I’d maybe try hooking it up to HDMI. Then, at the RetroPie menu, look for "Freeplay Change Display Driver" settings or some such. See if changing that helps anything."

That will likely work if it's a software issue.

If it's a hardware issue, that probably means that one or more of the connections between the Pi and the LCD aren't making a good connection.

An all white LCD basically means that the LCD is getting power but not getting initialized with any data.

The first/easiest thing to check is the LCD's ribbon cable attachment to the Freeplay board. I know that this is an old/poor video, but I think it gets the point across well. Check it out and make sure that the ribbon is fully inserted and the shoulders are locked down all the way. I have helped some people troubleshoot this issue where the shoulders weren't locked down. AND, it's a bit of a problem that sometimes it will work that way, so people have built it up and had a working unit and then it just stopped working all of a sudden. I think it was making a little contact and then something shifted and stopped working. Anyway, locking the shoulders should prevent any intermittent connections.
https://www.youtube.com/watch?v=sch5ZW1idz4

With the Freeplay Zero, the connections between the Pi and the Freeplay board are always a top suspect. In fact, even some problems can be solved by just reseating the Pi on a the Freeplay CM3 builds.

For the Freeplay Zero, I would always closely inspect the GPIO header. For anyone troubleshooting this stuff, I almost always ask for a photo of the pins and solder on the Pi Zero.

For you, StonyYodelers, because if your other thread about buttons, I would not assume that the solder is a problem. For anyone else that comes along reading this, though, it's the most typical problem.

Your mention if it working for a while and then going white makes me wonder if it's a problem with the ribbon cable's shoulders not being locked. That's what I've seen in the past, anyway.