Technically in this example, 'ta télé est bien' is correct as 'bien' follows the verb 'to be' and therefore is correct.
You wouldn't say 'ta télé est bonne' but you might say: 'C'est une bonne télé'.
Hope this helps!
It is not a must. C'est bon is also correct but carries a slightly different meaning. In the example of the tv, la télé est bonne, however, does sound weird.
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