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My Monitor has EMI Problem. need help.

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#1
i have a 2nd hand monitor. sharp lcd monitor LL-H1513-H model. it is very annoying that there are scratches from up to down. everytime i change my vga cord, it dissappears but after sometime, it comes back. i really an expert on this... thanks in advance.
 
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#2
If you're sure the cable isn't coming loose, it could be anything from a faulty power supply, dirty line voltage, or even a LCD panel or inverter going bad.
 

Bo$$

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#3
It could be some burn in? does it leave marks randomly or only when left on for extended periods?
 
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#4
Can you take a picture of it ?
To me it sounds like the connection on the monitor is starting to come un soldered.
My buddy had a Samsung monitor that did something similar and the DVI port actually fell off the monitors main board eventually, I was able to re solder it and it works fine to this day.