Hdm1 jack not working

SOURCE: 42LG50 TV - Intermittant sound problems with blu-ray HDMI input

You say this doesn't happen on regular cable or when playing a regular DVD. Hmm. Is this Blu-Ray player connected by simplink? HDMI is a bi-directional format cable, so  there are cases in setups where your tv can send commands to your blu-ray player and vice versa. It could be a problem with your blu-ray player that it is sending for some odd reason a mute command to your tv. Or is processing a command that your TV interprets to be a mute command when playing blu-rays. Because if it was the TV itself chances are you'd see this when watching a normal DVD or on cable as well. Since you say you're not, it leads me to believe the issue lies with the blu-ray player itself. 

SOURCE: "No signal" sign on TV screen using HDMI selector

it sounds like a refresh issue, double check you selector and make sure it fits the refresh of the tv. i had this once with a sharp where the tv was 120hz and the selector was 60 and it created a no signal and when it did come in it was jumpy. if you have a 120 tv then selector should be the same.

SOURCE: When i try to play a Blue Ray DVD, the LG LCD tv

Pickled! You did right by checking the cables, the tv inputs and as well the output on the blue ray...even by replacing the blue ray. Which leads to a problem within the tv monitor. I can only guess there is something in the software of the tv that is causing the problem. I can only suggest two options. If can connect the tv to a network via CAT5 cable, you can do a frimware update to the tv. Sort of like a software update. If it is not available, try to swap the HDMI cable for the 5 RCA component video. It will still carry HD signal, just not as crisp as the HDMI. I would be floored if the same thing happened with the component cable.

SOURCE: HDMI input does not work

Hi


Thanks for using FixYa. Two things may cause the “No Signal” message to come up are - no data available for closed captioning and a weak signal input. Your TV is in the Closed Captioning Mode. To turn it off simply bring up the on screen menu and scroll down to the part that says closed captioning and turn this function off! With the closed captioning block displayed and the program being viewed is not sending out closed captioning signals the TV will display, No signal!
I’ll suggest you to run the HDMI from the PVR (personal video recorder) directly to the TV (mute the TV), and then run the optical audio from the PVR directly into the receiver's optical in. The closed captioning is something that is addressed in analog broadcasts, but not necessarily digital broadcasts. Try using Component cables if this doesn’t make a difference. After using components cables the issue will be resolved. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

SOURCE: only av input is working LG 42LC7D TV

I may put money that some one did stole your internal cable from the power supply to the main board !

Don't be surprised they did it to me at LG company .