a clue might be that it doesn’t recognize charger. There are many posts elsewhere about this. Apparently, the charger has 3 connections +, -, and sense. If the LT does not see the sense lead, it won’t charge. This can be cause by dirt in the adapter or computer sockets, a bad adapter cable, bad internal cable or bad circuit on the MB in order of fixing ease and cost.
Start with blowing out the sockets and wiggling cables. A bad cable will probably require a new adapter, Internal cable assy are available, as are MB, but that can be expensive.