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!
Knowing when to use bien and when to use bon canbe confusion sometimes. With verbs that describe a state of being such as "être" the use of "bien" is favored. It wouldn't be entirely wrong to use "bon" but it means something different: La télé is bien. -- The TV is good. La télé est bonne. The TV is a good one. -- Chris. P.S.: Laura on her site has a valuable lesson on that: https://www.lawlessfrench.com/grammar/bon-vs-bien/
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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