LG TV 52LD550-UB BAD HDMI INPUTS

It sounds like you are experiencing an issue with your Kortek MagicSing YK5000 not connecting to your LG Smart TV via HDMI. Here are a few suggestions for troubleshooting the issue:

1. Check the HDMI cable: Make sure that the HDMI cable is securely plugged into both the Kortek MagicSing YK5000 and the LG Smart TV. Also, check the cable for any damage, such as frayed wires or a broken plug.
2. Check the HDMI input: Make sure that the HDMI input on your LG Smart TV is selected and that the TV is set to the correct input source.
3. Check the TV settings: Make sure that the TV's settings are configured to accept an HDMI input from the Kortek MagicSing YK5000.
4. Check the YPbPr adaptor input: Make sure that the adaptor is securely plugged into both the Kortek MagicSing YK5000 and the LG Smart TV. Also, check that the adaptor is not malfunctioning.
5. Check the TV firmware: Check if there's any firmware updates available for your TV and make sure that it's up to date.
6. Contact the manufacturer: If none of the above solutions work, it may be necessary to contact the manufacturer of the Kortek

If you wish to get more details, visit the site linked here. Line faults to many brand televisions are given with illustrations. http://electronicshelponline.blogspot.com/

LG 55LV5400-UB has a well known problem with the main board resulting in the symptom you describe or in loss of HDMI inputs or loss of sound.

it has to do with the main processor and some people recommend baking in an oven to help cure it.

We do not. There are many reasons why this is wrong, but the truth is it *could* give a short term success; it is almost certain to lead to long term problem and we have pictures and videos of boards sent to us after such attempts - usually already warped beyond repair.

Simply put, I'd say there is 99% chance you need your main board serviced or replaced.

here are two links to help with each option:

Repair:
http://www.coppelltvrepair.com/p/1632/ebt61521404-61521404-main-board-repair-service-from-lg-55lv5400-ubausylhr-led-tv

Replacement:
http://www.coppelltvrepair.com/p/1634/lg-55lv5400-ub-main-board-ebt61521404-61521404-serviced-tested-50-credit-for-old-dud

Try manipulating the TV mode selection to HDMI 1, 2, 3 or 4, whichever the number of HDMI ports are available.

You need to replace the main board.

I’m happy to help further over the phone at https://www.6ya.com/expert/dewayne_4a10eab6caecdb92

Try a different HDMI cable, then try the other HDMI inputs on the TV, then try to connect another HDMI device to the TV. If all are still bad main board needs replaced

Its part of the main board in most cases

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 .

The problem is the main board in your TV. If your TV is a LG or SONY brand, please try this:

Re-Flow Soldering Procedure for LG Main Board

1.Pre-heat your kitchen oven to 385 degree (No more than 400 degree);

2.Put the main board on a card board (like a pizza box board) in the oven;

3.Heat it for 10 minutes (No more than 10 minutes);

4.Turn the oven off & leave the door open, at this moment, do not touch or move the board until it colds down to the room temperature.

5.Install the board in the TV & try it out.

As you already checked PS3 and HDMI cable,
select HDMI input in TV and connect PS3 via HDMI cable. TV should show PS3 picture.
And if still no joy then HDMI input port in TV is bad and need to replace input board/ main board.