Asus PG279Q Power Issue?

[Yakusoku]

Hello!

Long story short. I turned on my system like normal several hours ago. Monitor works fine. I shut down the system and the monitor with it goes to sleep/power off.
Came back from work to play some games, boot my system and notice my main monitor the PG279Q didn't turn on as usual.

I did what troubleshooting I can. Since I have its older brother the PG278Q which has the same power brick, I tried using it on the PG279Q no dice. I then tried using the PG279Q's brick on the PG278Q, works and no issues. So its not a power brick issue.

Just wanted to ask if there is a way to troubleshoot this issue. And a possible solution.

Please and Thank You!

[DailyProcrastinator]

This may sound crazy, but it has worked for me in the past on more than one occasion. Might not solve your issue either but there is no harm in trying.

 

But sometimes capacitors get overloaded. And it can cause no display issues. The 'fix' is to unplug the power from the display, and then hold the power button for like 10 seconds. It drains any voltage left from the capacitors and therefor negates the no display issue because of capacitor overload.

 

Give it a go. If that does not solve your issue then ignore my crazy ramblings haha. 

[Yakusoku]

Was hopeful but nothing.

[Yakusoku]

Anyone ;(?

[Yakusoku]

Update. 

Woke up, the red led on its base still dead.
Decided to re plug the power cord.

It turned the thing back on!?
Went and took a shower, came back turned on rig. The monitor is alive, restarted and its still working like always.
Replugged the power chord(the one that's connected to the monitor) multiple times it's good(?)

 

Headed to work so i hope it's fine when I get back. 

 

Anyone know what caused/is causing this? 

 

[Nikola1301]

On 11/25/2020 at 5:23 PM, Yakusoku said:

Update. 

Woke up, the red led on its base still dead.
Decided to re plug the power cord.

It turned the thing back on!?
Went and took a shower, came back turned on rig. The monitor is alive, restarted and its still working like always.
Replugged the power chord(the one that's connected to the monitor) multiple times it's good(?)

 

Headed to work so i hope it's fine when I get back. 

 

Anyone know what caused/is causing this? 

 

Good day genglemen. I know it's been a long time since you originaly posted this, but seeing that TONS of people have these power problems, and there is literally no info online,I thought I'd share what I know. NOTE: I am no expert in fixing these monitors and I only did it for myself and my friends, this is just a temporary fix and will not completely solve the issue, a dying monitor is a dying monitor. 

So these monitors tend to just randomly die at the end of their warranty - no repairs - any very costly. By analyzing couple of Asus ROG monitors with similar symptoms I found out that most of them had literally no power issues -- if you start tracing the power you will see that all voltages are present, both the panel and motherboard test just fine (no shorts and resistance values ok) and if you test the buttons you will see that they are working just fine. So what's the problem? There are mainly 2 things that could cause these monitors to not start, 1.the startup chip 2.the g-sync processor on the g-sync expansion card. Let's talk about the startup chip first (I am writing this from work so I can't recall the chip number and exact location, but you will find it on the motherboard besides the slot where button flex cable is plugged). Inspect it visually, check for pin bridges or obvious damage. Most of the times, this was the failing or failed component so if you find a datasheet you can check if the PWR_ON signal is present - if not, replace the chip. 
The second issue could be the g-sync processor and its crappy termal paste (not because of its bad cooling properties but because of its quality. Most of the times, these processors run very hot and when the termal paste degrades over time it tend to liquify and leak around the processor, messing up the surrounding components -- sometimes going under the processor itself and creating chaos under it). Thoroughly clean up the surrounding components with rubbing alcohol/zippo lighter fuel and a toothbrush, then reflow the cpu with hot air gun and then clean it up again. Clean up the old thermal paste and apply a new one--reassembly the monitor and test if it works. By now, the monitor should power on normally, and if you somehow manage to keep it from completely losing power (plugging it into the UPS), it will keep on working as long as you dont unplug it from the power source. Cheers