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Why my screen works only sometimes?

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It step by step loses image like this. Finally it just becomes black.

Also it worked good For one day after half year no-use period. And it works great when its very cold.

We tried to change displays but the problem wasn't solved.

What can cause this problem? May be some capacitors or filters inside?

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Solución Elegida

If you replaced the screen without solving the issue, you probably have components that are missing, broken, corroded, or acting out (such as caps or resistors as you say, but other components that may have become part desoldered/have broken solder balls).

I'd start by examining the logic board using a magnifying glass (20x and more if possible) looking for anything suspicious, starting around the 3 screen assembly connectors (VERY CAREFULLY peel off the black film to reveal the components there).

Upload a picture if you see anything.

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