Broken tv can be fixed with light

At the forum of electronics engineers, EEVblog discusses an interesting topic: how to repair a broken LED panel yourself with the help of a ... ordinary flashlight. And most importantly - why is this possible?

Subject of repair - LED-panel TV Samsung UN32EH500, 2012 release. One of the users of the EEVblog forum began to fail a third of the right half of the panel. He says that the failure of the electronics is probably caused by the increased humidity in the room. The author of the message on the forum dyril unsuccessfully tried to repair the TV and wanted to throw it away, until one day he accidentally shone a flashlight at the bottom of the case, see the video.


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The cause of failure, according to him, is a slightly rusted layer of conductor on the cable, through which the signal goes from the microcircuit to the panel, and the microcircuit controlling this signal.





As it turned out, if you shine on this cable, the picture on the screen is corrected. If so, then the solution to the problem suggests itself: connect a small LED to USB that will shine permanently on the cable. The author did just that.



For aesthetic purposes, he sealed the LED with an opaque electrical tape, so that the light does not penetrate.



Now you can use the TV in normal mode. It is not clear why this is happening.

A similar situation was with the photon dumping of the Raspberry Pi 2 . There, too, the electronic microcircuit turned out to be sensitive to light, and if we shine a xenon flash on it, the computer would hang.

Here, the effect is not negative, but positive. The situation with the TV is rather strange. The forum suggests: perhaps a light-sensitive chip transmits a differential signal to the loop, and when the photons block one part of this signal, the other gets an opportunity to pass. One way or another, but here exactly the photon energy plays a role.