As an ex TV engineer (Rediffusion days) I can't believe I'm reading this.
No way should any unqualified person dare to attempt anything like this. There are very high voltages in a TV receiver.
As regards to removing covers on HiFi equipment, if you are very careful, you can remove the lid of an amp that has been disconnected from the mains for at least a couple of days and clean the dust out with an air can, (without touching anything) but no way, under any circumstances would I recommend anyone try removing the back cover of a TV of any ilk, LCD, Plasma or CRT and try cleaning it out, let alone trying repairs with incorrect components.
As everyone on here has told you, what you are doing here is total madness, Stop it Now, you are in serious danger of electrocution, and/or fire.