CRT Artifacting, Expert Help?

[Jacorby]

CRT Repeating Lines - 955DF

Hello, i was wondering if anyone here on hardForum could assist me with diagnoising, and hopefully correcting this CRT monitors display problem.

I'm seeing tracing of objects, usually dark on light, to the top right. This problem is replicable without the crt being plugged into a computer. By itself, unplugged for a video source, in standby operation this problem exists..

I think I have seen this problem elsewhere brought up, on the internet, regarding other late model crt monitors (a Sony Trinitron, I think it was, and another Samsung), but i havnt seen a resolution yet posted. My CRT is a Samsung Dynaflat Shadow Mask model.

I'd like to see this one in regular working order. This is one of my few performance displays, 10 bit color depth, 85 frames per second, strong gama(due to greater than ips viewing angles and lack of lighting bias..), under a millisecond actuation rate.. blurless. I cannot explain how fantastic is to use this in a controlled light enviroment, compared to my lcd's, and what a shame the problem it has is.

I may keep the unit for awhile, I may give it away to someone who could use it, and will appreciate it's qaulities, but i wont give it away in it's present condition... Especially since it is one of my primary displays at the moment, along with an oled, a late generation plasma, and a few lcd's, of various grades, 8 bit ips panels, FHD, pva's, ccfl's, led's. Amplitude width modulations ect. AND I judge this budget crt superior (overall) to all of them! Including my image retaining oled..! hahahaha That things black.. but it bands like the devil, too!! Thought i recognize there is a 10 bit reference oled out there, ut i dotn have it, so i wont talk about that! Sometimes i wish this thing were widescreen, so it can find even more implementations! But other time, it's good to be squarish too.

Yeah I'll come here for help, and i'll start a little ruckis too, call me Jacorby!~
I look forward to hopefully finding a resolution to this problem.

I'd also like to point out, this problem doesn't occur on high contrast primary color themes. For example green text on black does not replicate this problem.. Blue on black does not replicate this problem, red on black does not replicate this problem. However, black text on a cyan blue title-bar does.

 

[spacediver]

You might get some more attention posting in this thread

 

[Jacorby]

With all due respect spacediver, if your not posting on topic, as titled, you are detracting from the post, I have taken the time and effort, to make.

I've come here to solve a problem, primarily, as titled, please respect that, otherwise you are being disruptive. I didn't come here to be demeaned, I'd appreciate it if you deleted your reply to strengthen the thread.

Lets focus on this technical problem, not chat about my preference of this crt. That point was made mostly to illustrate and justify, the importance of any work done to fix the unit, in relation to my array, and other enjoyment of the unit. To try and foster support to resolve this mysterious issue, and get an answer on the net!

 

[spacediver]

you misunderstood. There are a lot of CRT enthusiasts, myself included, who frequent that particular thread. You're more likely to get the attention of these folks by posting in that thread. But I can see how my post's tone was ambiguous

 

[Jacorby]

Ok spacediver, i see. Thanks for taking the time to clear things up for me! hahaha

I might have to stop by there later then.
Cheers.

 

[jbltecnicspro]

Classic signal ringing. Happens in my GDM-F520 on occasion (and many other F520's, apparently). How comfortable are you taking apart a CRT?

EDIT: Disregard for now. Check your signal cable and try another one. Could be a loose cable or a bad cable. If that doesn't help, let me know and we can dive into this a little further.

Double EDIT: Hmm, rereading this it could be a video board problem. I'll expound on the GDM-F520 problem. With the GDM-F520, the edge connectors on the video board get loose over time and it causes signal ringing. I don't remember if this caused signal ringing in standby mode or not (I never let it go to sleep - I always power OFF as per Vito's instructions). To fix the GDM-F520, I had to remove the video board, apply Stabiliant 22 on the edge connectors of the board and the receiving connectors on the mainboard. After I did this, I resat the video board and it's been good ever since (knock on wood!). It's a common problem with this monitor and even brand-new they could develop this issue. Thankfully, my Artisan and FW900 have been spared.

I believe that if you took apart your monitor and reseat your video board, you may fix this problem. With my GDM-F520, if I had a ringing problem, even the OSD would show the ghosting as well. Don't do the Stabilant 22 just yet (it's expensive). Simply reseating the board may be your permanent fix.

 

[Jacorby]

Thanks for sharing.

Classic signal ringing, ehh? I've taken the lead, but I haven’t had much luck finding reference images to compare with.. But some of the descriptions I’ve heard, I think we might be onto something here..

I noticed elsewhere on this forum, under the large "24 GDM-FW900" post, around page 336, that another member was referencing a similar sounding problem, which he resolved by cleaning grounding lead contacts, and creating a new ground point for a stray grounding cable mysteriously untethered.. I have never done anything like this before. Unfortunately some of the pictures in the thread are no longer hosted..

TBH, I'm fairly uncomfortable taking any crt! Thanks for asking. However, I might be more uncomfortable passing the buck, in this case, so to speak. We'll see. I might just go forward with the suggested procedures.

I have disassembled and modded LCD;s before.. to build the yet to be built,.. I don't know though pal. I also been shocked by a big power supply cap in an lcd once already.. If reseating the board and cleaning contact points will help, we might just go there. Hopefully somebody has another idea, and can contribute some input before hand.

If I preform the procedure.. it might not be right away, either, we might postpone for a few days or a week or two, cause if I go on there, while I am in there, I might want to change the vga cable too.. so I'd like to investigate the feasibility of this interest too.

do you have any information on the contact points for cleaning? I don’t know if your gonna be around here at the time if I perform this operation. What are the edge connectors of the board, and what are the receiving connectors? I know a bit about lcd's i seen a few pics of inside crt's sometimes looks like a mess.. Not like a nice eizo flat panel. I have only tried the monitor with the one power outlet here. My other CRT's fine though, but perhaps the grounding, I'll return in a few days to post results, when i can gt some assistance relocating this unit for a test. There are some stairs. I'll be checking periodically for my more information. Hey you never know, it might just be unable to ground properly?

The signal cable is direct, so does not detach with this unit. I don’t think i can test it. I did plug into another computer too, directly via VGA port, and also then turned it on detached from any computer, in all cases symptom is present. Here are some images, someone may also identify the problem..

 

[Jacorby]

I have a high power air blow dryer. Maybe tomorrow I will try and "dust it", by blowing in and all around... like how I dust the pc's. Perhaps dust is somehow the culprit. Certainly quicker than taking the thing apart or relocating. I just hope I don/t blow anything out of place.. We'll maybe just before the weekend I will try that..

 

[jbltecnicspro]

Hmm... Your vga cable being permanently fixed to the screen definitely complicates this. None of my bigger Sony's have a fixed VGA cable - they all have receptors. Looking at the images you posted - oh yeah - classic signal ringing. Notice how the "ghost" signal bounces on the right, and never the left of the actual object being displayed? I don't know what exactly causes this, but this is telltale sign of signal ringing.

I would suggest just cleaning the contact pins on the VGA cable, but it has the ringing with no signal too... Very strange. I'm almost certain you're going to have to take that dude apart to see where the trouble actually is.

 

[spacediver]

I think the reason it occurs to the right is that this is the direction that the beam scans. Possible causes of ringing are discussed here

 

[jojo69]

we don't have to remind you to be goddammed careful if you open it up right?

 

[XoR]

You might get some more attention posting in this thread

you misunderstood. There are a lot of CRT enthusiasts, myself included, who frequent that particular thread. You're more likely to get the attention of these folks by posting in that thread. But I can see how my post's tone was ambiguous

What does this square monitor have to do with GDM-FW900?

 

[spacediver]

dunno if serious or not. If you are, the answer is in the second quote you posted.

 

[jbltecnicspro]

What does this square monitor have to do with GDM-FW900?

Analog video is analog video. Likely the same issue that would affect a GDM-FW900 would affect his Samsung and my GDM-F520. Like spacediver said, there are many CRT enthusiasts who frequent that thread who can help him out. That thread is really one of the last bastions of CRT enthusiasts, and may posts have been made about other monitors.

 

[XoR]

FW900 thread is in the same category Displays as this thread. I highly doubt anyone who visit FW900 thread regularly do not visit Displays category or could miss thread with "CRT" in it, especially with [poll] which make it like super visible. Browsing FW900 thread is fine idea but posting there is little ridiculous. Advice to post actual solution in FW900 thread should it be found would be much better and understandable.

CRT monitor questions do not need to all go to single thread like it was some CRT ghetto outside of which there is some LCD domination. Any CRT, even Samsung deserve its own thread.