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If you used a conductive material like Aluminum to shield the PCB, remove it. Temporarily shield it with non-conductive tape, for example, lightly apply scotch tape to it, to prevent a shortcircuit.
Re-place the front of the bezel, the connector and logic board assembly, and keep them stuck to the monitor using tape. Re-connect all internal cables, then connect a working display output and a power cable.
It's obviously dangerous to test a display without covering up it's components, but it's extremely tedious to remove the entire bezel assembly over and over. Use thick, non-conductive gloves, exercise caution.
Turn on the monitor, propping it against something solid, or having someone hold it in position. Run tests, for example a full-screen video or a full-screen "stuck pixel fixer"
If the problem reappears, re-apply insulation to the top PCB and repeat step 3.
If the problem does not reappear, remove the tape, re-apply the thick plastic shield using scotch or kapton tape in place of the black tape, and re-assemble the bezel.
After making sure all cables are in place and secured, simply place the back of the case on top of the monitor, align it correctly, and push down along the perimeter.
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