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Main system control memory IC fault. This is a very small IC; have 8 solder terminals, and can be located very near to the main system control-chroma IC. Check and replace it. Be sure to replace it with the same number printed on it; in all respect. Otherwise, it won't go. http://electronicshelponline.blogspot.com/
The main board is having issues as that would account for the different symptoms. You should be able to get a replacement main board from www.tvrepairworld.com
Check on the back of the TV to see if you have a "remote in" port. It will look the same as a 3.5mm headphone jack. Unplug the TV and plug a pair of headphone into the port and then remove it. Do this several times to breakup any debris that may have gotten into it or corrosion that may have occurred in the port. If something is in the port it will disable the standard remote sensor on the TV.
I'd check out the IR board on your tv. If you have electronics experience open up th etv find the IR board - trace it back to the AV board make sure all connections are plugged in good then if that doesnt work I'd replace the IR board first. That would be the cheapest part to replace. Also it could be the IR on the remote - but if the codes you used to program the programmable remote are known good for your model i'd look at the tv first.
Remove the actual stand (4 bolts are hidden in a sunken down spot for them on the back of the tv.
Once the stand is out of the tv, look down to where the swivel joint is at, you should see 4 screws that are going towards the bottom of the stand, those will be the loose screws.
Necesitarias que cambiar el circuito que recibe los comandos del control remoto;
Abre el enlace y ahi encontraras la parte que necesitas: https://www.tvparts.ca/tvdetail.php?id=6393
37LG30 - loosened the 4 screws on the back of the TV but base mount wouldn't come off. Found that had to remove the screws even though already loose so that doesn't bind in the holes. Did this by making the loose screws bind in the wholes. Using twisers in the whole would have done the same thing. o
This is more probably a software fault within the TV. They need instructions for HDMI inputs & a no sound is a related fault. I would get in touch with your dealer to arrange the TV to be updated to cure this problem. Hope this helps.
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