How do i get a full picture

You need to replace the T-Con board. You can get parts from here and fix it yourself. It's not difficult.

check the screen,and screen data line, If you want buy some tv parts ,remember this website:www.abctay.com,there have many kinds of tv replacement parts

Yes. Both are similar to see.
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I would verify the voltages on the power supply board first because an improper voltage to a circuit board may make that board look bad.

Here is the manual for Haier http://image.haier.com/manual/tv/ledtv/201110/p020111018525755526455.pdf but if you could be more specific on the model it would be easy to find.

0075.0039.0010.
Try these codes. If you wish to get more details; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Common codes to check devices with different brand TVs are given, in the order of the device's brand name list in alphabetical order. Pull up older posts. Surf the site with patience.
http://remotesearch.blogspot.com/
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there are 3 possible problems
the backlight could have failed
the powersupply for the backlight could have failed
or the backlight inverter has failed.
i would suggest taking it to a technician to find the exact source.
you can also take it apart and use a volt meter to test the voltage on the back light's power supply to see if that's the problem. but this kindof probrem is usually caused by the backlight burning out.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/tyler_d7f5052aae55714c

Go into menu with remote control & change picture size. Depending on which station you are watching you may have to change it to suit your viewing preference. They transmit in different sizes

Probably in the power supply. Take it back or call for warranty service.