my monitor screen is black but has power and is connected properly

[Supremox]

My monitor is a lenovo d27-30 and apparently, it only shows a black screen, it all started after playing youtube it suddenly turned brown into a black screen that shows nothing and then it never shows display again. This monitor is my main monitor beside the second one and now I don't know how to fix it anymore by trying the fixes about this issue. Any recommendation or confirmation that this monitor is dead?

[Phénomènes Mystiques]

Първоначално публикувано от Andrius227:

Първоначално публикувано от WinterSolstice:

How can it be a power failure when the monitors still run since without issue? Maybe more of a power cable fault than any true failure.

I read "failure" as completely not working so maybe the interpretation is improper.

OP's issue seems more like a power failure but it's hard to say.

Well the power cable contains the power supply (on my monitors, some monitors have internal power supplies) which is a critical component. And it failed completely on my monitor and i had to replace it.

That's rough.

[Andrius227]

Първоначално публикувано от WinterSolstice:

Първоначално публикувано от Andrius227:

Well the power cable contains the power supply (on my monitors, some monitors have internal power supplies) which is a critical component. And it failed completely on my monitor and i had to replace it.

That's rough. :citizentears:

That was actually good, kinda. I bought a new power supply for ~£10, easy fix. You have no idea how many people throw out perfectly good monitors just because their power supplies fail and they don't realise they can replace it.

[_I_]

Първоначално публикувано от Andrius227:

Първоначално публикувано от WinterSolstice:

That's rough. :citizentears:

That was actually good, kinda. I bought a new power supply for ~£10, easy fix. You have no idea how many throw out perfectlypeople good monitors just because their power supplies fail and they don't realise they can replace it.

that monitor has internal power supply, not a brick
since it has a power light that works, its not the power supply tho

[Phénomènes Mystiques]

Първоначално публикувано от Andrius227:

Първоначално публикувано от WinterSolstice:

That's rough.

That was actually good, kinda. I bought a new power supply for ~£10, easy fix. You have no idea how many people throw out perfectly good monitors just because their power supplies fail and they don't realise they can replace it.

Oic, mine doesn't have that feature, so it would be internal so I guess I got lucky.

[Supremox]

Първоначално публикувано от Andrius227:

Първоначално публикувано от WinterSolstice:

So, here is a weird solution that worked for my old monitors and it has to do with static buildup and discharging it (I think you are saying the Power LED is turning on without a visual monitor cue but here it goes): :csd2smile:

My monitors used to go black at random, no signal, and basically not work out-of-nowhere at times, so the solution I found was to unplug the monitor power, hold down the power button on the monitor for 15 seconds, then replug the monitor back in and it worked and only one time more within 6 years did it ever do this again, plus I bought a second matching monitor and guess what happened? Yep same issue, so for me it was monitor specific on the ASUS but someone I helped who tried this trick with an ACER also said it worked. :yetuhappy:

Maybe I should have stated this earlier also, but for me, it did not matter if the system was turned on, it was better if it was so I knew the solution would work. :chirp:

That also sounds like a power failure. My monitor was also asus, specifically pg278q. Had to get a new power supply from ebay (there are loads of them available, which suggests its a common problem) and it is still working fine to this day, its 9 years old now.

So i just need to replace the power cord of the monitor?

[_I_]

if the power light turns on without blinking or anything, then its power supply board is fine

no mfg logo or osd menu means it has no backlight

if you have a very bright flashlight put it directly to the display, look for a partial image around the light

[PopinFRESH]

Първоначално публикувано от _I_:

if the power light turns on without blinking or anything, then its power supply board is fine

no mfg logo or osd menu means it has no backlight

if you have a very bright flashlight put it directly to the display, look for a partial image around the light

Not necessarily true as the power LED is on a separate voltage it could be working but the PSU is failed; however, this does sound like the backlight failed and/or the PSU failed. For example my old Panasonic plasma TV had it's PSU fail but the power LED would still illuminate because it was on a low 3v rail that was still working but the rest of the PSU was dead. It would depend upon how the PSU is designed.

The other direction would be more sound of an argument. E.g. if the power LED won't turn on at all then there is a high likelihood that the PSU is dead. But just because the power LED will turn on doesn't wholly rule out that there is a failure with the PSU.

Testing with a flashlight to see if you can see the image would be a good first step to see if it is just the backlight.

OP if you aren't risk adverse and are somewhat technically competent you can get a replacement PSU and display board for that monitor for around $25-$30 if it turns out to be the power supply. E.g. if you don't see any image on the pane using another light source to rule out if the issue is the backlight.

[_I_]

but the power board does not turn the led on, the main board does that, and will often do blink codes if there are other problems
if the led turns on and off to the power button, then the power board/brick is ok

[PopinFRESH]

Първоначално публикувано от _I_:

but the power board does not turn the led on, the main board does that, and will often do blink codes if there are other problems
if the led turns on and off to the power button, then the power board/brick is ok

Again, that is not necessarily true. Just like with your PC your motherboard may still have some status LEDs lit even if your power supply fails and is no longer able to provide 12v but the circuit that is providing 5vsb is still working.

I do think it sounds more likely to be a backlight issue, but the power LED turning on and off doesn't rule out that the internal PSU could have a fault and is not supplying power to the backlight.