Looking for RCA TV Part and Zenith CRT TV Issue

[liammc00]

Since you say the Zenith misbehaves when it has not been used in awhile. Well I hate to say this but this sounds like bad electrolytic capacitors to me. I would use an ESR tester and check the caps for bad ESR. I also would check for cold joints. The only way to know for sure if the tube is getting weak is to test it on a CRT tester. As I have condemned TV's before that I thought had bad CRT. Well I'm afraid that's all the advice I have and hop you find EEPROM. Know I'm going to get to watching a show on my 80s Sony TV which still beats all of my other CRT TVs.