It seems that you may have a faulty switch, I have included a video that covers Video Monitor Repair and generally is the same for most models. Things to keep in mind when repairing units is that components inside can have high voltage, sharp edges and corrosive content.
Each model is a little different yet the component placement and purpose is pretty universal for brands and display units. Please take care when opeining and diagnosing the issues with your unit.
Source:
you can go to any monitor repair shop & get it.
just tell model no. or take the sample which is defective.
good luck.
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