I have a Korean 1440p monitor that I have de-bezzeled. Lately when I start it up in the morning, or leave it sitting for a couple of hours it has a bunch of white vertical lines on it. After about 10 minutes the lines all fade away though, and stay gone until the monitor isn't being used for a bit. I have tried unplugging and re-seating all of the cables, but that doesn't seem to help. I have also thought maybe there is a bad solder that is making a connection when it is heated up, but I couldn't physically see anything on the main board or the video board that looks wrong on it. I have googled around and have not really found a helpful solution. I really don't think it is a bad monitor since it goes away after it is warmed up.
Uhhu.. that's pretty much the connection between the logic board and the panel itselve. Its either those conductive foamy bars or hotbar (fletfles directly solderd/molten onto the display) That the issue goes away makes me thing, that the thermal expansion of the screen (backlite, other excess heat) makes the contact points join so the image gets good.
I would guess, if you take a hairdryer and gently heat up the upper or lower edge of the monitor they should go away as well.
Did this occur before you debezzled it? Before ~ wouldve been better off to RMA it. Sounds like a bad cap somewhere - read up on caps and you'll learn about the esr levels (cold and warm). Of which my gut is directing me towards. If you change out 1 cap you're best off changing out them all and replacing them with high quality japanese ones. Takes a good few hours to do a neat repair job, but it should fix it.
From what I can see all of the capacitors on the main board are not showing any signs of damage.
Unfortunately it started right after I debezzled my monitor, got a new dual-link DVI cord, and updated my Nvidia driver. I have narrowed it down to the monitor for sure though.
I am still betting on the connection (flatflex or what ever) to the LCD itself. The bezel may have added that slight amount of pressure the heat expansion now has to deliver...
Did you have to pry a lot when removing the bezzle? Did your remove the whole plastic housing of the display?
After you debezzled it.... bugger. You must have knocked something somewhere.
Cap damage can be sometimes hard to see (excluding the extreme obvious instances). Minor things to look for:
powdery substance on top - wash your hand after touching it
moves around (bad contact)
when you push on the top it feels like something is crumbly
slight variations in shape - minor convex to the top/sides (slight bulge)
Low quality caps can suffer from really high ESR when they're cold (even a decent cap thats defective can do this). Once warmed up (like in your case) the caps work as intended and no more lines.
But now that you've said that all this is after the debezzle then yeah.....
Not really. The whole plastic housing is removed. It is currently being held up by strong double sided tape and duct tape. I am planning on JB Welding it once I figure out what the problem is.
Ok, but the wires and contollerboard were covered by metal the whole time? Are there any cables on the back (flat ones?) that run in the breze?
You mean the whole monitor, e.g. you doublesided the stand to the back?
As the lines are pritty evenly propagated over the screen I still think its a connection error, as most likely one contact delivering the signal to the LCD is not good. (get better with heat worse with cold.)
Are there any naked circuit boards or cables on the back? (picture of the backside maybe?)
Try to kinda not "hang" the screen on the stand.. cut the doubleside and lay it flat down.. maybe the fact that you mount the stand onto the metal backing causes strain, were it not should and that loosens the contact.