IT STARTS TO SHOW GOOD THEN, IT GOES CONCAVE PICTURE. THEN SOMETIMES, IN THE CENTER OF THE SCREEN,MONITOR ON FULL PICTURE AND SUDDENLY YOU SEE A 3 INCH RED AND BLUE SQUARE SITTING PERFECTLY IN THE CENTER OF THE SCREEN,ALONG WITH THE PICTURE, STILL SHOWING, WITH THE WORDS IN THE SQUARE --- CONTROL LOCK. NOW WHAT IN HEAVENS NAME IS CAUSING THIS? I TRIED EVERYTHING AS A TECH, WHOW WORRIES. ////// HELP HELP HELP.
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there are several reasons why picture of crt monitors did not display good picture. if your monitor had horizontal line at the center of the screen?...the faulty is in the vertical deflection, check the vertical oscillator also the fusible resistors & capacitors around that section. if there had vertical line at the center of the screen?..check the horizontal deflection, horizontal output transistor also check the YOKE.
The picture board on your monitor is bad, since it turns
black atimes, it means the
board of your monitor has developed fault.
The best thing for you
do now is to take the monitor to a local repairer within your vicinity or any service center
to help with the replacement of the picture board
because the fault is not something you can fix yourself. in order not to
check your vga cable that is connected on your cpu,for some lose connection,it must be fitted if you still don't get any display check your cpu.have some other monitor for isolation,if you dont have bring it on s repair center,your cpu has a problem.
sounds like your monitor is starting to go out. if there are any speakers near your monitor, it is likely magnetic interference. try moving your monitor to a different area and see if it still does this. if it does, i would replace the monitor. if it doesn't, just simply reorganize the area around your monitor and it should go away after degaussing the screen.
There may be a problem with the data cable... that's the symptom when you move it. Arrange the monitor that suits your computing and move/adjust the data cable until the screen goes perfect, then tie it or plaster it or anything that will keep it steady (I have done this on one of my computers... it's still working) good luck...
I ended up fixing my problem, but I'm not sure what the solution is. I had some faulty electrical equipment that I was using to power the monitor (220V to 110V converter and a bad power strip) and I got rid of them. I was using the converter because I moved to Israel and I thought I needed to feed the monitor only 110V, but I now realize that the power cord for the monitor has a built-in converter that accepts 220V input. Now the monitor is plugged directly into the wall and is working fine. Try using a different power source (maybe the wiring or plug you're using is faulty). Good Luck!
if you can't expand your screen size from the pulldown menu or vertically or horizontally center the picture one or two of the centering coils could be partially burned out. the monitor uses electromagnets around the crt neck to center the picture. varying the center controls apply or take away voltage from the coils to center the image. may be time for a new monitor
This problem is showing when the main PCB of the monitor failed. contact the LG service provider in your area. They will change the full package assembly or PCB. check this link to get the service center info http://www.lgservice.com/