MacMod.com - Your Mac Modification HQ - Discharge a CRT: "After grounding the tool, you will want to place the probe under the CRT cap and make contact with the metal clips that hold it into place (see fig. 2 and 3).� This will discharge the CRT and make the display ready to service.�� If you see sparks, then you know the display has been discharge, but also you have not let enough time for it to dischargen naturally.� Next time you discharge this particular display, double the amount of time you waited e.g. instead of 10 minutes wait 20 minutes. �
Pretty much, discharging a CRT is taking a probe from under the CRT cap to a ground on the chassis so you don't get shocked. "
