Avatar of Joshua Stroud
Joshua Stroud
Flag for United States of America asked on

No Signal on third monitor (LG TV)

Hello,

I have an A/V question. I just mounted 5 LG TV's in a few offices. I terminated each end to a HDMI keystone, and the length of the HDMI run is approx. 15 - 20 ft. I'm connecting the PCs to the TVs as a third monitor. Of the 5, two are working without an issue, but i'm having issues with the other three. The OS and the graphics card is detecting the TV as a third display, but after choosing the correct input on the TV, it's still displaying "no signal". This is the case for all of the displays that aren't working.

Any advice or guidance will be helpful!
Operating SystemsDisplays / MonitorsPC* audio/video

Avatar of undefined
Last Comment
serialband

8/22/2022 - Mon
Joshua Stroud

ASKER
Furthermore, I've verified that the issue is not with the HDMI ports on the TV, as I'm able to extend the display when plugging a laptop directly into the TV.
Kimputer

Specs of the ALL PC's and ALL the monitors?

Obviously, if they're ALL the same, it's probably the LG TV (which you could have tested by swapping the screen on a working combo, where the screen suddenly fails)

If it's all mixed up with various types and specs, it could be that you're using too high a resolution for the TV to handle it (test it by lowering it).

Saying that it's working on the laptop, therefore the TV is fine, is still not 100% correct. Still need to know the resolution of the laptop vs PC.
Joshua Stroud

ASKER
It's mixed up, i have three Lenovo PCs and two Dell Pcs. All the TVs are LG 55UU340C devices. I'll provide the specs in a later email. As of now, one Lenovo works, and one Dell works. The setup is identical from the TV to the PC:

4' HDMI -> HDMI wall plate -> 20' HDMI cable -> HDMI wall plate
DisplayPort to HDMI adapter -> HDMI wall plate
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy
Joshua Stroud

ASKER
in regards to the resolution, i'm setting the resolution to 1920 x 1080 on both devices.
David Johnson, CD

not all video cards support 3 monitors ie. 3 @ 1080p resolution.
Walk around with another laptop and confirm that the cable and tv connection work. Assuming that the cable and TV work then for those computers  that don't try a USB2HDMI adapter
Dr. Klahn

4' HDMI -> HDMI wall plate -> 20' HDMI cable -> HDMI wall plate

That's a fairly long run for HDMI.  It does not help that the signal is going through two wall plates.

Bring the afflicted TVs into the same room as the computer that is feeding them, and attach them to the computer directly.  If they work in that configuration then there's a problem with the wiring.
Get an unlimited membership to EE for less than $4 a week.
Unlimited question asking, solutions, articles and more.
ASKER CERTIFIED SOLUTION
serialband

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question