HITACHI 58" ULTRA 4K Smart TV (Minehead)

HITACHI 58HK6100U
Non-working (properly) Only blue screen suddenly
Screen and backlights in good order so something failed with video processing I expect
Could get sound and channel change but cant see what your doing due lack of screen info.
3yrs old, with stand and remote. Had a workshop repair last year so not wanting to spend more on it.
Good for spares maybe repair? Good spec.
Not in box