Switch dock repairs?

I have a load of dead docks with various issues. A lot of them dont display image on tv. But make the switch go black green light etc. Has anyone fixed them ? Just wondering whether it’s worth trying to fix them or not. Is it worth charging the video converter chip on them ?

Some no power at all, some hdmi ports broken, the ones with damaged hdmi port ihave repaired.

Thanks for any help.

You can get these used on eBay for $20 - $40.