Since you droped it once, try to open the tv from the back and check if the crt board is still connected to the neck of the crt tube. it might me lose or not sitting right. I hope you did not break the borad in that tv. well, you have nothing to lose, open it and and check it out. good luck
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Are you using the AV input for the XBox or other cable? If you use AV, then use the same input that the Xbox does not show picture, plug in a DVD and see if it works. If it does not have a picture, so 100% your TV has problem.
Last time one of my durabrands did this I unplugged it for like 10 mins and gave it a nice kick to the side and it worked fine again. I know it sounds crazy but dont kick it too hard like dont crack plastic. I have also done this to oversurged CRT monitors
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
IT IS LESS WIDTH PROBLEM
It has to be done by tech person as inside tv high voltage is thare so unskilled person should not open tv.
problem is simple.
1 less output from regulated power supply .
2 if width control is there it can be done by that.
A very good chance this tv was dropped or bumped. Sounds like the internal plastic frame is broken and will not support the picture tube. Find someone with tv experience to fix this. I would suggest they use a putty found at an auto parts store. To glue the tube and the frame together. This putty is in a plastic tube. You tear off a piece and fold it several times to activate. It will surely do the job.