When I try to turn it on the screen flashes a red and green box interchangeably. It seems to be in standby mode or something and will not go to an input or anything. There is power to the tv and it does turn on, but stays on the red and green boxes and then turns itself off after a minute.
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Sounds like display panel fault. These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box. http://electronicshelponline.blogspot.com/ These flashes are fault indications, called blinking codes.
These flashes are called blinking codes, and are fault indications. If you wish to get more details to these blinking codes, check the site linked here.
Pull up previous posts by its left sidebar, or type in thebrand name and model number to of your set, to its search box, and
press 'Enter' or view it in Mosaic / Timeslide
Problem solved. I tried playing DVD and the TV picture was fine. So I double-checked cable wires from cable box - one of the wires was loose (obviously it was the red color input). After tightening, the TV picture is good as new.
You should be watching your dvd's on an input and not on tv analog 3. Every time the tv "senses" a signal change in the audio that screen will pop up. Connect the DVD player to the tv by using either the red, white and yellow (composite) connections or using the green, blue, red, white and red (component). Once you are on an actual input that box will stop popping up.