Most of those problems seem like internal display issues, except maybe the PB 100 (logic board caps or failed contrast/brightness potentiometers).
If recapping the LCD's control board and touching up some of the other solder pads doesn't help, I'm not sure you can resurrect them: LCDs often use either a strip of conductive rubber, or ribbon cables bound straight to the electrodes on the glass. Sometimes fiddling with the conductive rubber strips works, but often it's degraded and nothing can fix it. The ribbon cables can be a tough fix, depending on whether they're rubber or metallic traces: the rubber ones break down, and the metallic ones are difficult to re-attach permanently. I'm not even 100% on how the manufacturers get them to stick on there in the first place. I've tried applying heat and pressure, but that never improves anything (and sometimes made it worse).
If recapping the LCD's control board and touching up some of the other solder pads doesn't help, I'm not sure you can resurrect them: LCDs often use either a strip of conductive rubber, or ribbon cables bound straight to the electrodes on the glass. Sometimes fiddling with the conductive rubber strips works, but often it's degraded and nothing can fix it. The ribbon cables can be a tough fix, depending on whether they're rubber or metallic traces: the rubber ones break down, and the metallic ones are difficult to re-attach permanently. I'm not even 100% on how the manufacturers get them to stick on there in the first place. I've tried applying heat and pressure, but that never improves anything (and sometimes made it worse).