My trusty MZ-RH1 has lost the OLEDs on the RHS of the display, which is a bummer because that's where all the useful information is shown. The OLEDs just packed up one day. Luckily it still plays perfectly, and I have the sidecar so I can see Playback information, track numbers etc. But when it comes to recording and editing, though the machine will still do it,  the sidecar doesn't show that information so I can only do things like Rec. format/Move/Erase by complete guesswork - not at all