I have a bush smart TV but it's unable to support pd.

Question edited for clarity.
Question moved from Smart Computers to Bush Television.

No, if is worked before, you don't need a booster. It is a software glitch or a WiFi setting that is incorrect.

Factory Reset the television. Re-enter the WiFi settings, (SSID and Password), and then do any Software Updates.

Google

bush (model) factory reset

All questions need 'make model (what is is)' as first 3 words please.

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You have to go into the audio setup on your tv with the remote. There you can adjust where the audio output is going and turn off the tv speaker.

On any Smart TV, all you have to do is contact Netflix and they will be able to send you a code to deactivate it.

most likely . go into smart tv settings look for application setting
go into this and remove youtube application.
However a smart child could use internet browser and www.youtube.com
http://www.mckeay.net/2008/11/26/blocking-youtube-with-a-wrt54g/
You could connect the tv to a router and block tcp port 53

Main power supply regulator board (SMPS board) fault. Check and replace it. If you wish to get more details visit the site linked here. http://electronicshelponline.blogspot.com/
Search the site by type in the brand name of your device in the search box at the top of the home page, to get gathered all the related posts.

Did you check with the manufacturer on their web site? If not available it is because the set was a special model for a large store - they change the model numbers on those sets so they cannot be shopped. You need to find the equivalent JVC model which asise from a different model number is identical.

They do NOT make special models for these big retailers - just give them a special number.

You really need to read the manual to your TV. You need to have a router connected to a high speed Internet service. If you mean connect to the Internet, your smart TV will,have to have a browser, like Opera to enable you to get online. The smart TV apps are selectable with your remote, but you have to get the connection first. If you don't have high speed Internet and a wireless router it ain't gonna work. I don't have the manual to your set, so I can't tell you the exact steps you use on your remote control.

Need specifics - model numbers.