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PC HDMI to TV HDMI no signal

Posted on 2013-01-18
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Last Modified: 2013-11-08
We have an LG TV (42LT360C) that is connected to a computer via HDMI. The TV has 3 HDMI ports - HDMI 1 and 2 to the rear of the TV, HDMI 3 to the side. The computer was originally connected to HDMI 3, but after turning the TV on from overnight standby, it indicated 'No signal'

We have since tested connectivity (to HDMI 3) with other TV's (different makes and models) using various computers and experienced the same issue.

It should be noted that the HDMI 3 ports tested were all to the side and do not appear to be integrated to the same board as the rear ports.

HDMI 1 and 2 have been tested over a period of 4 days and dsplayed correctly after being in standby over night. However, the equipment has since been delivered to our customer and the 'no signal' previously experienced with HDMI port 3 no occurs with HDMI 1.

The 1.8M HDMI cable is gold plated and of reasonable quality. This cable runs in a short conduit alongside the TV power supply.

The installation is fairly basic and I am struggling to get to the bottom of it. Could anyone shed some light on this issue.

Thanks
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Question by:swan_solutions
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Expert Comment

by:Scott C
ID: 38793786
I have a friend who was trying to hook his LG tv to his computer and had to download a driver from LG to make it work.

See if there are any PC drivers on the LG site for your TV.
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swan_solutions earned 0 total points
ID: 38813343
We have conducted a fair bit of investigation on this and have identidied we were dealing with 2 seperate issues.

Firstly, HDMI 3 (on the side of the TV) seems to lose its signal if the TV is switched to standby. Despite the manufacturer suggesting that all HDMI ports are exactly the same, in practice this does not appear to be the case. We have experimented on a number of different TV's using a number of differnet computers and the behaviour is the same - the TV indicate 'No Signal' when switched to standby for a lengthy period of time (i.e. over night). Solution - no not use the HDMI port on the side of the TV.

Secondly, when we delivered the TV to site, the customer indicated a similar issue despite our successful testing in our workshop. We went to the customers site to investigate further and identified that the computer being used with the TV was connecting to the network via wifi which had a very poor signal. The computer was running digital signage software which was reliant on connectivity to the internet. When the wifi dropped out, the digital signage software displayed a black screen which fooled the customer into thinking there was no signal. Solution - we installed a data cable to replace the wifi and provide a stable connection.
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Author Closing Comment

by:swan_solutions
ID: 38826226
Our investigations and action have resolved this issue
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