After opening samsung t220 monitor black vertical lines apear

Hello i just followed some instructions from this forum for solving an other problem with this monitor ( i disconected the set of buttons at the side of the monitor, menu, bright, etc)
Now the problem i had is solved BUT now the monitor has some horizontal lines, in some places, specially in gradients.
Do you an idea what happend?

Thank you very much :) , Nicolas

PS: It justed fixed by its self in the instant i was writing, but i'll post it anyway just to know what could have been the error
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More about opening samsung t220 monitor black vertical lines apear
  1. In general that means a cable is loose or not making full contact.
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