AOC 27 monitor Q27G2WG4 doesn't display logo or image on screen
Hello. I have a problem with my AOC 27 monitor, specifically model Q27G2WG4, which I have been using for 3 years. The monitor stopped turning on: when I turn it on, the backlight turns on, the indicator starts glowing white, but the logo on the screen does not appear, and there is no image. However, if I check in the Windows system, the monitor is displayed as connected and working. I tried connecting it via HDMI and DP, but the result remains the same. If I turn the monitor on and off multiple times, it will eventually start and work. However, when the monitor is working, there are no issues. I would be grateful for any help, perhaps someone has had a similar problem.
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Hello. I have a problem with my AOC 27 monitor, specifically model Q27G2WG4, which I have been using for 3 years. The monitor stopped turning on: when I turn it on, the backlight turns on, the indicator starts glowing white, but the logo on the screen does not appear, and there is no image. However, if I check in the Windows system, the monitor is displayed as connected and working. I tried connecting it via HDMI and DP, but the result remains the same. If I turn the monitor on and off multiple times, it will eventually start and work. However, when the monitor is working, there are no issues. I would be grateful for any help, perhaps someone has had a similar problem. -
Hi,
I see there are no responses yet to you post. I have the same kind of monitor (Q27G2U/BK with the same symptoms.
Backlight is working and sometimes when switching sources between HDMI ports or after power on it shows the AOC logo and will work fine with a video signal up to 1440p, until the input is interrupted and the problem comes back.
I've replaced the video board that connects to the TCON with a second hand one, which does not solve the problem. Hard to tell of course if the replacement is also broken.
The previous owner said it might be related to the cable between video board and TCON on the panel, as the screen would sometimes work when he wiggles the cable. I cannot seem to make it work that way.
I expect some component or over-current protection circuit is kicking in or there is a voltage too low somewhere on the power board perhaps.
Would be good if anyone would have a schematic / service guide for this monitor.
The search goes on.
Panel: TPM270WQ1
video board: 715G9500-M0C-B00-005K
Power board: 715GA907-P02-000-001S
The monitor seems to be the smaller version of CQ32G1 and equivalent to CQ27G1 regarding internal parts.
regards,
Doorzon -
Hello, I have similar issue with a different model Q27G2U/BK.
I'm at my wits end here and the search does not provide any valuable info about how this issue can be nipped in the bud.
Only changing refresh rates back and forth multiple times helped bring the picture back but now any full-screen application causes the monitor to turn black, and switching refresh rates causes the same issue.
My only idea is that something is wrong with the Adaptive Sync implementation on the monitor or the T-CON board.
I think firmware reset could help in fixing the issue, at least I've found some obscure Russian forum where seemingly the same issue was fixed though re-installation of the firmware with an acquired dump - Forum Link.
Unfortunately they are not eager to provide firmware for free and lock the download links behind point system that requires you to pay or solve issues.
If anybody knows any way of resetting firmware on AOC monitors or has firmware dumps available - I'd greatly appreciate the info.
Best regards!Comment
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Just in case it might help someone, I've found information that reballing DFU64H1 chip on the t-con might solve the issue.
The other option is replacing t-con entirely.
So it seems at the moment the only known steps are:
1. Reinstalling firmware.
2. Reballing DFU64H1 chip on the t-con.
3. Replacing t-con entirely.Comment
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