It's a soldering problem. On the mother board, check with the ohmeter the resistor R612. you must found 4.7kohm.
With the soldering iron very small (cms parts) solder the zener diode ZD602. with correct soldering the resistor R612 must be at 4.7kohm
:-)
Use the On-Screen Display buttons on the lower right or lower left corner of your monitor to check what will remove it from appearing.
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