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There are connectors and circuitry that control the vertical and horizontal picture image generation that need to be at the edges of the screen. The border simply covers these connectors and circuitry so the user cannot see it. Newer models of flat panel TV's solve this problem better to get more picture real-estate to the user. Flat panel TV's are not like the original CRT (cathode-ray) TV's of the past that had borders to conceal a non-linear distortion that occurred at the edges.
In what way is the screen broken? cracked, distorted picture, no picture but has sound?
If it is cracked. Replacement of screen is expensive. Cheaper to buy a new TV.
If Distorted. Parts linked to the screen can be the culprit. Most common part to fail is the T-con board. Main board may not be sending signal to the T-con board.
If its no picture but has sound. Back lighting has failed which could be several things that can cause that.
without any other details besides "broken" it will be hard for someone to help with diagnosing your problem. We need symptoms like. has sound but no picture. Picture has horizontal or vertical lines. part or half of the screen is black, black borders don't count. Hope the info here has, in some way, helped bring you closer to what to do with your TV.
I found the solution on mine. To restate, I just saw a thin white border around a black screen. Pressing the channel up or down buttons changed the screen, in some kind of test mode to shades of gray, and red, green, and blue. I started finding a solution when I noticed when on one of the color screens, that the volume up or down buttons brought up a new menu for color intensity. Finally, I got back to the thin white border screen and pressed the arrow keys in the top half of the remote. Finally a TV screen and I pressed the enter key! Voila!
pop the roundish 'HP' cover of the back of the stand. Remove the 4 black screws and the stand comes away. The case is just a clamshell affair, the main piece is the rear cover, the LCD front plastic border locks into it. The screen with components mounted is sitting loose in the back cover once the front border is removed. The trick is to pry off the front border without damage. Hook the fingers under the border where it lays against the LCD screen, wiggle, pull, curse and do it again. The top and bottom borders come loose easier than the end borders. Once these are popped free, stand the unit on end between your knees and pry away the end borders. A wide putty knife slipped between the border and metal frame will save your fingers but don't damage the screen. When the front border is off, lay the unit face-up on a table, undo the screws for the control panel and power switch modules, flip it over and lift off the back panel. Everything is under a metal casing.. I had no voltage from the power supply, trying to find a Fairchild chip SG6902SZ on the small control module, P/N ILTR-003, else the Pwr Bd, P/N ILP-004..
you need to adjust the screen voltage. behind the front grille and inside cover. a small black box 6 adjusters protruding from it. only adjust the the color counterclockwise that matches the problem in this case it's the green so look for the knob with "G" marked by it. there are 2 with "g" marked by them the row across the top of the box are for focus don't adjust. back the knob off untill the raster is blank with your input set to an inactive input, the picture should be blank and black.
when it is you have the adjuster close to where it should be, now change the input to an active signal and turn the color off so that you wil have black and white picture. adjust that knob untill you do have a truely black and white picture not too green or red or blue. go back to inactive video input and check that there are no lines of any color on the screen. repeat if needed. always adjust these knobs slowly the set will be watching you ! if your autofocus won't work now you have the adjustment set too low. check this function before putting back together again. these adjustments can be real touchy so be patient
G2 = screen...On the screen controls behind the front grill, behind the hardboard. 6 pots, 2 rows of 3 pots. 3 for focus and 3 for screens. 1 for each of the the red, green and blue guns/crts.
To adjust: Run set, change to black screen with tv/video button. Dial each screen clockwise untill you see a color. Then counterclockwise slowly untill that color goes black, then stop. Do this for all 3 screen controls.
If you need to adjust the focus then bring up lettering. I use the QVC channel for this. Focus is done by eye.
I have the same TV, and I was getting the black spots on my screen as well. It is dust settling on the bottom mirror. Yoiu can call Mitsubishi and spend 150-200 on getting it cleaned, or you can do like I did and take the front panel off and the 10 screws around the edge on the back of the black plastic border around the screen. Then lift up gently and have someone hold the screen for you and gently dust the bottom mirror. I did this by myself, but it would be wise to have 2 people do it.
this symptom is caused by a poor regulation in the power supply circuit. too low dc supply voltage will result to insufficient deflection, both vertically and horizontally. black borders appear around the raster. receivers generally use regulator in the main power supply to set the dc supply voltage at the value that will allow the picture to fill the screen with a little overscan. defective regulator can result in a small raster. most modern receivers today are using ic (integrated cirduit) regulator. but if you are not inclined with this kind of job, better bring it to a qualified tv technician. good luck!
Check the resolution settings on your cable box, you may have to call your cable provider to find out how to get into the settings menu, there is a stretch function in the settings that should make all the lower channels auto fit your screen, also see if there's a p=size button on your remote control, try pushing that when on the channels that have sidebars.