Sadly the video doesn’t really capture your issue. I could see a very short upswing in brightness looking at the blue bottom edge.
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So let’s look at this from the displays perspective… you have a LCD PANEL which is illuminated by an LED light bar which is dispersed within a cavity and diffusion sheets so the entire panel area gets the same amount of light.
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So let’s look at this from the displays perspective… you have a LCD panel which is illuminated by an LED light bar which is dispersed within a cavity and diffusion sheets so the entire panel area gets the same amount of light.
So if we trace back the light via the LEDs we have a circuit which filters and adjusts the voltage (brightness) which was in turn got its power from the power supply. And the power supply got its power from your house AC outlet.
So we need to break down this pathway into a smaller area for deeper diagnostics. So the easiest way is to check the AC outlet using a simple gage or DVM to validate the outlet is properly wired and grounded. Next is to isolate the outlet circuit so only the system and display are using it disconnect and remove anything that’s sharing this outlet and the other lights/outlets that share this circuit feed by fuse/circuit breaker. With that done is the problem still present?
The next test is running a good thermal monitoring app on the system, this then gets into what OS the system is running. You stated Windows but is this a Mac systems running Windows or a Dell or other Windows system? Remember this displays connection is dual use! Thunderbolt on a Mac via a Thunderbolt port or DisplayPort via the same connector (mDP) which can also be a factor.
Sadly the video doesn’t really capture your issue. I could see a very short upswing in brightness looking at the blue bottom edge.
So let’s look at this from the displays perspective… you have a LCD PANEL which is illuminated by an LED light bar which is dispersed within a cavity and diffusion sheets so the entire panel area gets the same amount of light.
So if we trace back the light via the LEDs we have a circuit which filters and adjusts the voltage (brightness) which was in turn got its power from the power supply. And the power supply got its power from your house AC outlet.
So we need to break down this pathway into a smaller area for deeper diagnostics. So the easiest way is to check the AC outlet using a simple gage or DVM to validate the outlet is properly wired and grounded. Next is to isolate the outlet circuit so only the system and display are using it disconnect and remove anything that’s sharing this outlet and the other lights/outlets that share this circuit feed by fuse/circuit breaker. With that done is the problem still present?
The next test is running a good thermal monitoring app on the system, this then gets into what OS the system is running. You stated Windows but is this a Mac systems running Windows or a Dell or other Windows system? Remember this displays connection is dual use! Thunderbolt on a Mac via a Thunderbolt port or DisplayPort via the same connector (mDP) which can also be a factor.