One quick and dirty way to narrow down the problem area is to purchase a can of electronic freezer spray. If you use this with the narrow straw like applicator that usually comes with spray cans you can "freeze" individual components to see if the TV restores to normal picture. Do not flood the area, be sparing in how you apply it. You are trying to isolate the problem component.
Initially try to determine whether a component is "hot" or just warm to save spraying too many components. Place the back of your hand close (definitely NOT TOUCHING ANYTHING) to get an idea of the radiant heat being given off.
BE SAFETY AWARE! THE TV IS "LIVE" DO IT WITH ONE HAND BEHIND YOUR BACK (only half joking - that way you will not have one hand accidentally touching something live - which is bad enough - and the other touching something else that you shouldn't)
The ones covered in metal do run warm/hot, that is why they have heat sinks to disperse the heat. Remember electronics can run warm and even hot.
It may be trial and error but then again you may get lucky.
After freezing the correct component, the TV should behave normally. When the effects wear off it will return to being faulty so you can determine by freezing it again whether you have the correct one or not.
It might be prudent to have a mirror in front of the TV facing to the back where you are working. That way you only have to look up and over (or around) the TV to see if anything has happened when you spray.
Here is a link to what I mean. You may have to source something similar from your local electronics shop.
Do one or two components at a time, give it time to have an effect before moving on that way you will not be confused as to which one may be the problem
SAFETY FIRST! Remember to disconnect the power before touching anything in the back of the TV
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jeffjeffjeff145 have you removed the back of the TV to determine which part or what location heats up? Could be an issues with the power board. Let us know what you find and post some pictures of your boards with your question. Use this guide Adding images to an existing question for that.
I have opened it and looked a couple weeks ago, but nothing seemed to be wrong with the wiring or anything. The screen and around the vents on the back just produce alot of heat. And once it gets hot enough, Horizontal lines travel up the screen. Turning it off and letting it cool fixes that but it takes awhile. How exactly is this TV supposed to stay cool? Is there a fan somewhere?
Just checked and your model TV does not have a fan. Excessive heat is usually an indication of some component having failed. Turn it on with the back removed and see if you can narrow down what heats up. Post some images of all of your boards with your question. For that use this guide Adding images to an existing question Whenever something heats up like that you need to check the MOSFETS and Diodes as well.
I will do that. It might take a day or two though. That TV is way too heavy for me to lift alone.
Ok I've opened up the back however I know very little about circuitry. Where are all the boards located?
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