I have a 27 inches Samsung P2770H monitor. Since a few months ago it started having this issue where it would turn off and then turn on after 2 seconds (monitor would completely turn off not just backlight).
It mostly happened when watching a video on full screen, but it happened a few times just using a web browser or writing in vscode. And once it happened, it would happen again every few minutes.
I first thought it was the power supply (it uses an external 14v 3.5a brick), so I replaced it and the issue continued. Someone told me to check the inverter transformers, the board (BN44-00308C) has 4 of them, they all measured the same resistance with minimal variation. So I checked the tcon board (not sure if thats the right name, the board where you connect the power and dvi/hdmi input). And found this:
it doesn't show well in photo, but in the back side of the board, in the position where the MP2372DN is, it's really brown from the heat. I did a little experiment, and placed a tiny piece I cut from an aluminium heat sink with some thermal paste (ended up being just a block of aluminium without fins because otherwise I coulnd't close the board metal enclosure).
It's been two days and I watched 3 movies and some long youtube videos on full screen without having any issue. So I am assuming the issue is caused by the MP2372DN overheating (the datasheet does says that it has a thermal shutdown protection).
Has anyone seen this type of issue with these kind of regulators?
My doubt is if I should change the MP2372DN (which only seems to be available from china and who knows what the quality it is), or if there could be some other component causing it to overheat.
It mostly happened when watching a video on full screen, but it happened a few times just using a web browser or writing in vscode. And once it happened, it would happen again every few minutes.
I first thought it was the power supply (it uses an external 14v 3.5a brick), so I replaced it and the issue continued. Someone told me to check the inverter transformers, the board (BN44-00308C) has 4 of them, they all measured the same resistance with minimal variation. So I checked the tcon board (not sure if thats the right name, the board where you connect the power and dvi/hdmi input). And found this:
it doesn't show well in photo, but in the back side of the board, in the position where the MP2372DN is, it's really brown from the heat. I did a little experiment, and placed a tiny piece I cut from an aluminium heat sink with some thermal paste (ended up being just a block of aluminium without fins because otherwise I coulnd't close the board metal enclosure).
It's been two days and I watched 3 movies and some long youtube videos on full screen without having any issue. So I am assuming the issue is caused by the MP2372DN overheating (the datasheet does says that it has a thermal shutdown protection).
Has anyone seen this type of issue with these kind of regulators?
My doubt is if I should change the MP2372DN (which only seems to be available from china and who knows what the quality it is), or if there could be some other component causing it to overheat.
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