My model is TE76ATC;the drilling bit is stucked and wouldn't power on

Drill bit? If it's stuck in a piece of metal try drilling from the other side and then knock it out use a maller drill bit.

Stuck in metal, use vise grips to grab it and turn counter clockwise

Stuck in drill chuck? Get a key for the electric drill. Battery operated, use a par of pair of channel lock pliers to open the chuck.

Remove all power source from the drill spray WD-40 Where the drill bit is at dont be stingy with the oil wait for about 5 mins then try to turn the chuck if that doesn't work use a rag and a pair of channel locks. More then like lee something got in between the gears .

easy to fix
with the drill not running

grab the bottom part of the spinning part of the drill nearest the drill's motor.
then
grab the spinning shaft bit nearest the drill bit
pull them apart slightly

when the two parts are pushed together thay lock the chuck

I own a ryobi hammer drill that does the same thing

Put the bit in a vise and try to turn the drill to release the bit. You will need to put a wrench on the area of the drill that's holding the bit and do the turning by the wrench.

This is caused by tightening the chuck using the drills power, if you clamp the bit in a vice and using a pair of multi grips on the chuck in an anti clockwise direction gently bounce the grips and after a few tries it will undo, don't use too much pressure or try to unwind it in one move or myou will damage the chuck sleeve

Low quality steel drill bits get stuck in the Makita because the hammer impact squashes the metal, forming a ridge that gets snagged on the anvil's steel ball bearing. Use only impact drill bits.

If the chuck is stuck open and you cant "muscle" it closed something is probably jammed up in there and it needs to be replaced. Chucks take a good share of the abuse on power tools and most manufactuers consider them a "common wear item" like brake pads or Tires on your car. A chuck is fairly simple to replace if your drill stuck open and they are commonly replaced on the higher end "Industrial Grade" Power Tools like DeWalt and Milwaukee.
Looking at the Make and Model of your drill it would probably be easiest and most cost effective to just replace the entire drill. If you tried to replace the chuck and found a chuck that will fit your tool it may cost you anywhere from $25 - $40. For Around $40 you can purchase a new drill with a fresh battery.

the chuck sounds like it is bad or maybe stuck from rust, what you can try and do is spray some WD-40 on the jaws and then try and holding the collar with a glove and run the drill SLOWLY in forward/reverse and see if it loosens up if not you will need a new one.

When this happened to me I held the shaft of the drill bit tightly with my hand and reversed the direction of drive for an instant. It released at that point. It still does that occassionally though.