Testing for a Broken Screen?

[SLK001]

Does anyone have a way to test for a broken LCD screen prior to purchase? I'm talking about TVs that have died on the previous owner and they are selling it for a song. Of course, the TV doesn't power-on, so that way is out.

I purchased a Samsung 40" that was supposed to be okay (except it didn't power on). After fixing the power supply (capacitors) and firing the thing up, there was a crack across the screen. I've tried various ways of looking for a cracked screen, but I have succeeded with none of them.

I've just been chalking the bad ones up as "you win some, you lose some". I like to sell whole TVs locally, as I don't want to deal with the people who claim that I sold them a board that doesn't work (the "skeet" shooters).

[japlytic]

Re: Testing for a Broken Screen?

I find using a bright torch can often reveal breaks in the panel - unfortunately, this technique not work on true LED panels (aka AMOLED/Retina).
But detecting LC material loss is a bit difficult (before the LCD displays anything) in my experience.

[ecking767]

Re: Testing for a Broken Screen?

the good old sun light !! I will carry the TV outside and let the sunlight shine onto the LCD screen facing up to toward the sky. you may need two person to do this.

you live in the sunshine state, me too !!

[Alastair E]

Re: Testing for a Broken Screen?

Spraying a little glass-cleaner on the screen plus a good light shows up most busted screens...

[johns1mj]

Re: Testing for a Broken Screen?

I have not found a way yet. I usually buy them for less then the interior boards are worth. If I can fix it great if it is a bust then I can break even with parts sales.