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Regarding the same Dell P2719H monitor model: it would run for about 20 minutes, then shut down for another 20 minutes or so. Even unplugging it and plugging it back in wouldn't make it turn on; it would only start up again after those 20 minutes had passed. I noticed the absence of the 3V "power-on" signal from the power supply. Initially, I suspected a component sensitive to heat—perhaps a DC-DC converter or some SMD capacitors. I checked the power supply unit, but everything was fine. I then removed the 24C02 (U1001) memory chip and read its dump using a programmer (in my case, an RT809H). I replaced the 24C02 chip—I wanted to use a larger capacity one, like a 24C04, but the only alternative I had on hand was a 24C16. I wrote the dump I had saved from the original 24C02 (U1001) onto the 24C16 chip. The monitor has now been running for over 60 minutes. The first time I powered it on after installing the 24C16, it took about 15 seconds to start—likely the time required for the 24C16 to initialize.

Dell P2719H L7144-1 748.02T01.001 BAKUP 0K U1001 25C02...25C16 I.TV ok .BIN

https://files.fm/u/vk2ufx2z7ctr7zjb

@iuliantv​ Unfortunately, the joy only lasted about 5 hours before it restarted again. In the end, however, I managed to fix it—truly fix it. There were some "cold" solder joints near U1001 and the processor. I initially resoldered the processor pin by pin, but that didn't yield any results. It turned out to be some 8-pin DC-DC power components and their surrounding area; I resoldered each pin individually using a soldering iron, then applied flux to the area and used a hot-air rework station. Everything is fine now—it has been running for over 13 hours without any issues.

below is a photo of the area I heated and bonded

https://postimg.cc/dkMrZsGJ