Currently working on a FRV25 which is experiencing this: Upon turning it on, you see the Sony splash screen, and immediately afterwards it goes to a blank screen. You can see the backlight working. I connected an external monitor and the same issue persisted. I then swapped out the memory for known working modules as well as changed out the processor for a known working CPU. Both things did not help to alleviate the issue.
I tried researching via Google and all I could come up with is a convoluted Hardware Analysis forum which stinks. There were a few posts, that I could find, out of several hundred, that indicated a problem similar to mine. I don’t know the fix but I thought I’d document this for future reference. If I figure it out, I will definitely post it here.