RCA Model # 20F510TD TV/DVD

First it started coming on, then all of a sudden it would go dark, then a couple minutes later it would come back on etc. This went on for a week or so then it stopped coming on altogether. Now, you can put a DVD into the dvd player and it will work, or at least you can hear the sound etc..... just no picture. I have done this with the back off and see no bad fuses, no burned circuit board spots, loose connections. It is getting power to the circuit board at the tip of the tube but no activity past that........ any suggestions as to what else to look for or test if you aren't sure it is the tube. I talked to RCA warranty shops (2) and they are saying the tube ( LG ) is actually the maker.... is and has been a lemon for them thus far.... RCA isn't even offering it as a replacement part anymore ( discontinued ). Any help would be appreciated.

Burl Faulk II First it started coming on, then all of a sudden it would go dark, then a couple minutes later it would come back on etc. This went on for a week or so then it stopped coming on altogether. Now, you can put a DVD into the dvd player and it will work, or at least you can hear the sound etc..... just no picture. I have done this with the back off and see no bad fuses, no burned circuit board spots, loose connections. It is getting power to the circuit board at the tip of the tube but no activity past that........ any suggestions as to what else to look for or test if you aren't sure it is the tube. I talked to RCA warranty shops (2) and they are saying the tube ( LG ) is actually the maker.... is and has been a lemon for them thus far.... RCA isn't even offering it as a replacement part anymore ( discontinued ). Any help would be appreciated. Burl Faulk II