Electronics > Repair
Acer 4K monitor troubleshooting
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fiskmaas:
Hey EEVblog forum,

So I'm trying to diagnose what could be wrong with my monitor. It's a Acer xv273k, the problem is that it blinks black every ~500ms. Here's a video of the problem: https://imgur.com/a/UcL3sEb

So it's definitely a monitor problem, it persists on OSD and on different inputs. I'm wondering if anyone knows what it could be, or how to troubleshoot. I'm not very experienced with troubleshooting electronics like this, but I have all the gear required (cheap oscilloscope, multimeter etc.) and experience soldering.

Any and all help welcome as I was hoping to get some more time out of this thing, warranty expired just 6 months ago :(

Thanks!
wraper:
Seems to be a backlight issue as image seems to persist when backlight disappears. Probably protection kicking in and backlight restarting. Could be a problem with backlight driver or an issue with LED strips which causes protection to kick in. Try adjusting brightness setting and see if it changes anything.
n4u:
Yea.. You may additionally  check with flashlight - it should be visible image when you highlight the screen. I will start with temperature of inverter and capacitors.
fiskmaas:
Thanks both for your quick answers.


--- Quote from: wraper on May 19, 2023, 10:27:19 am ---Seems to be a backlight issue as image seems to persist when backlight disappears. Probably protection kicking in and backlight restarting. Could be a problem with backlight driver or an issue with LED strips which causes protection to kick in. Try adjusting brightness setting and see if it changes anything.

--- End quote ---

Yep, lowering brightness seems to fix it for the time being, going above ~60% will make the blinking start again. Does that indicate something specific?

I also tried the flashlight and it seems to just be the backlight. Image is constant.

Traceless:
I'm going on a hunch here and say this is a power supply problem. I've had similar issues with Samsung screens. Does the power LED go slightly dim when the backlight cuts out?
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