We have a ground loop roll on the projectors at our church and LCD in the lobby. It disappears with adding the death ground lift adaptor on the computer. Whats the next step to make it safe?
Three of the projectors are in the worship center. I can see that the 4 square box the outlet that powers two of them are mounted on the red iron. The other projector is in the sound booth. There is also a projector and LCD in another room.
I really do not want to leave the ground adaptor in place.
I look forward to you replys.
Nick
Rather than lifting the ground on the sound system, you should consider eliminating the ground loop current coming from the projectors. We typically run CAT-5 or CAT-6 with Baluns (Bal-Unbal transformer) adapters for long projector runs plugged into different outlets. CAT-5 is good for 1080P HD, while CAT-6 is called for to send 4K video.
This follows my general grounding mantra of "ground locally / isolate remotely". Each piece of AV gear should get its safety ground from the local EGC conductor in its local power outlet, and then you should isolate the shields interconnecting the gear. I have one church site where we installed a 1-in/4-out active HDMI DA (Distribution Amp) with four baluns feeding video screens and projectors in three different rooms. Not a hum bar to be seen or hum to be heard once we got that in place.