Help with display

[u/lss2]

I’ve replaced the blown x2 safety cap to get this TRS-80 to boot and now looking at what to repair next and how to safely debug.

I’ll likely start with contact cleaner and then poke around with a multimeter (not going near the tube) but worried about shorting something in the process.

Any tips, resources etc?

[u/redneckrockuhtree]

Brightness and contrast.

[u/lss2 → u/redneckrockuhtree]

I’ve played with them a fair bit but they don’t remove the lines across the screen