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LCD display logic and earth ground

drkidd22

Member
I have a LQ150X1LG91 LCD Module mounted to a metal plate. This plate is connected to earth ground.
My issues is that the LCD module mounting holes are metal and the displays' logic ground is tied to this mounting holes.
What happens then is that the logic ground and earth ground are shorted, anyone have experienced this? Should I be isolating earth and logic ground?
 

MaxHeadRoom78

Well-Known Member
You should not have any problem.
For example your desk top/tower PC has an earth referenced DC supply, so anything you use connected via USB, ports etc. is referenced to earth ground.
The MOBO ground plane is connected to this earth GND.
What is the LCD system fed by, power wise?
If via a SMPS etc, this should not present a problem as the is generally not referenced to ground itself.
Max.
 

drkidd22

Member
I did some more digging and the chassis ground is tied to logic ground through ferrites by L3,L2 and L10.
This means that also any other sections of the system that uses the same logic/power ground to be tied to the chassis.
I mean would this create some sort of ground loop? or cause other issues?

example.jpg
 

MaxHeadRoom78

Well-Known Member
I would think the circuit would operate as expected, just that the circuit will be referenced to earth GND through the mounting plate.
Max.
 

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