View Full Version : CRT experiencing blue flickering.

03-12-2017, 11:05 PM
So I scored a Gateway EV700 for my sleeper build, but after a few months of use, I started to see a weird blue tearing effect on the screen. I've tried both passive and adaptive HDMI to VGA adapters as well as a DVI-I to VGA (which I'm currently using). The flickering seems to be random and at times just turns my whole screen a tint of blue. I use the monitor as an extended display in conjunction with my LCD monitor. The CRT goes to the DVI-I adapter, while my LCD goes straight into DVI-D. Both of which are plugged into my GTX 980 FTW. I tested the monitor on an old Gateway laptop from 2007 with a native VGA port and it seemed fine after letting it run for about 4 hours straight.

There's probably 4 things I think it could be. Feel free to correct me if I'm wrong:
1. My GTX 980 FTW video card may have some compatibility issues with the monitor's frequency.
2. The DVI-I to VGA adapter might be decoding the signal incorrectly.
3. The VGA cable somehow magically developed a fault in the cable within the time I've used it.
4. Within the 4 months of using the monitor, it is starting to fail and it may be it's time. :tears:

All the while I've been typing this thread, I've had the CRT playing YouTube videos and no noticeable signs of blue flickering yet. Here's a link to a video that perfectly demonstrates whats happening:

Any thoughts on how to fix this would be amazing. Thanks!

03-13-2017, 12:39 AM
I have seen this on the video games I service. It has always been a bad cable/adaptor.

03-13-2017, 11:52 AM
I have seen this on the video games I service. It has always been a bad cable/adaptor.
OK new problem. After turning on the CRT this morning from standby and using it for an hour or so, now it's started making a ringing noise from inside. I only got it to stop after I turned off the monitor.

03-15-2017, 12:21 AM
So after adjusting my VGA to DVI-I connection, the blue artifacting seemed to disappear. Shortly after, I tried increasing my CRT's refresh rate and found out about 1/2 an hour into use, it started to buzz so I reverted back to 60Hz and (although it didn't remove the noise entirely) it made it barely audible.

Now I went to sit down at my desk and bumped the table to see the worst thing imaginable. I saw my entire image warp for the briefest moment. I lightly banged my fist on the desk and kept seeing it reappear. After a quick power down and rest, I booted the CRT back up and it was gone. Although I was quickly greeted with the blue artifacting from before, which leads me to believe that problem was something to do with the CRT internally.

Everyday there seems to be something new to this CRT. I've only had it for a few months and I brought it to have a CRT (+ it matches my retro setup perfectly). I'd hate to see all the cleaning and elbow grease I put into it go to waste. If anyone can help fix these issues, please do! Thank you.

Eric H
03-15-2017, 12:39 AM
It looks like you might have a bad solder joint inside the monitor somewhere, possibly on the board that plugs into the base of the CRT.

03-15-2017, 08:41 AM
FYI: Please don't start new threads for this monitor problem. Keep it all in the original thread so people can follow along without having to go back and find out what you may have done previously.

While watching the screen, wiggle all the cables and connectors to find a possible bad contact point.


03-15-2017, 05:45 PM
I merged the threads to avoid confusion and so people can follow along easier.

03-18-2017, 07:17 PM
My first guess would be bad soldering. Any time something is sensitive to vibration, that's the first thing to check. I doubt it's the CRT itself.

Personally, I'd keep an eye out for a nice Trinitron. If you're going to have a CRT, it might as well be a good one.

CRT computer monitors are a dime a dozen if you can find anyone who will bother selling them. You might want to check with some local e-waste companies. They don't contain enough valuable metals to offset the cost of dealing with the CRTs, so they should be delighted to to get rid of some.