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Replace the FBT. Never switch on this set, any more; till it has been replaced. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Search the site by type in the brand name to your device, in the "Search box at the top right of the display window" to get gathered related posts.
How long u have this RCA analoge tv?Around 10 years or more and used it like about 5 or 6 hrs everydays?Yes,than ur tv it is losing CRT tube radiation cohetion.As times go bye years in years out the tv CRT-(tv tube) radiation will slowly dying out,Tv actual pictures will lost some of it luster and it brightnesses to the tv auctual pictures.Brightnesses of CRT tube will get darker and darker until the tv actual pictures barely it is watchable anymore.Contrast,Brightness and Colors adjusting more will help some.But u have to take this tv aparts and take a Flat scerw driver turn up a little bit more of the tv HV-(high voltage) SCREEN button on the FBT-(flyback transformer) to make any big differences of the CRT tube brightnesses.The FBT-(flyback tranformer) is the big block of plastic with a red wire with a black cap hook up to the tv CRT-(tv tube).This adjustment on of the FBT,HV-SCREEN button will help the tv CRT-(tv tube) last another year or two.
Ur tv the high voltage it dead,the FBT,the flyback transformer.The big black block of plastic with a red wire with a black cap that hook up to the CRT(tv tube) is dead.The FBT,flyback transformer needed it to be replaced to solved this problems.Call the shops,take estimates for the best deal to do the repair.This is one of the main part of the tv to put HV in CRT(tube tv).It pretty hard to find this FBT these day,because of the discontinue of making of Amalog tvs.
Turn it off u leave on to long ur CRT Tube will dies soner.Resolder the FBT,the flyback transformer, the big block of plastic with a red wire with a cap hook to the and the transistor beside it.This transformer is the HV to the CRT to get power.
This problem might be caused by a problem called blooming. is the picture fuzzy and does the picture look to be streched out. Since you do not have contrast and brightness control this would almost completly point to the HV section of the TV either the control and screen grids of the CRT are going bad or the HV power supply is about to go bad, I would suggest that if you have a background in electronics that you check the HV at the anode of the picture tube and make sure the voltage is from 20Kv to 40Kv using a high voltage probe. You will need a schematic to aid you in your troubleshooting
Bad technicians always say picture tube problem when the TV has black screen with sound.
This a false statement and in some cases techniciacns use this to scare the owner or the charge a hefty amount.
The truth is that picture tube outlast most component in the TV. If it will fail, it is gradual like the colors will fade or one or several color will be missing. This condition is the degration of the filament in the gun (CRT tv has three -Red, green , blue)
I started to repair TV in the early 80's and only in one occasion that the Tube fail and it is a crack in the neck.
For black screen with sound, the most common cause is the HV supply problem / Horizontal section. This can be caused by many things, like flyback transformer failure, horizontal outout transistor, horizontal drive, etc.
For the cost-depends on where you are, in some countries labor is dirt cheap, in other ountries the parts are expensive.