My Asus Transformer is not charging?

A few months back my Asus transformer stopped showing the charging signal when I plugged it in to charge. So where the battery symbol was on the transformer screen, it was not recognizing that it was charging; basically, not showing the lightning bolt sign. However, it still did charge, but very slowly, like taking 2 days to fully charge. But yesterday it stopped charging at all. Now it is dead and I still don't know what's going on. When I tried using the USB 3 port to charge, it didn't work either, and when I used an iPhone charger brick but with the transformer cable, it didn't work. I do not know if it is the transformer, or the charger, or even the battery. Can someone please tell me which one is faulty?

Added (1). It's a tablet.

I recommend by bringing your pc away by some media market. They can help you out. There's not really a way for us to know something about your pc…

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