Zenith Computers & Internet - Recent Questions, Troubleshooting & Support

I presume you mean a battery which looks like a disk. The place where it goes has usually a sort of button below. The writing goes on top. if the 2 batteries go on top of each other, both writing are on top.

THEY ARE NO LONGER MADE .

look on line for a phono cartridge, replace the old one. wires are standard and color coded.

if its a cathode ray display its got vertical scan problems then its the line timebase more than likely a resistor gone high value or a leaky capacitor take the board out and have a good look for burnt out resistors and printed circuit damage change any electrolytic capacitors

No it is not

replace the monitor: it's lost vertical scanning

Yes. It can be replaced. http://electronicshelponline.blogspot.com/

Check the audio settings and make sure that you did not set it to external speakers only.

NEMA 3R protects against falling water down on top of enclosure, NEMA 4 protects against hose directed water. See reference https://www.nema.org/Products/Documents/nema-enclosure-types.pdf

check your video input im id the right place. sometimes poor quality cables can do the same thing.

sounds like you have bad capacitors on your main power supply board you can replace them if you know how to solder solid state electolitic componets. not hard but you need to know how. may want to just replace monitor