There's little else that could be damaged by you shorting it out and killing the chip, I would suggest you try a proper quality TDA2050, it's quite likely the Chinese ones are fakes - there are huge numbers of fake semiconductors coming out of China.
I bought ten LM35's from Banggood (just for stock) and when I came to use one I was really struggling, so I tried another - still didn't work. So I ordered some from RS - worked perfectly.
I tried all ten on one of my component testers, some were bipolar transistors, some were FET's, some were SCR's - all had presumably been removed from reject bins, had the numbers removed, and relabelled.
A friend of mine, who still does TV repairs, sees it all the time - he won't fit anything from China without testing it first.