Volume not responding on Direct TV remote

replace batteries --if not still working possible circuit board damaged ===cheaper to replace then repair

It sounds that the remote control should be programmed once again with TV with its setup codes. Setup codes for Samsung TV are:

0105 0077 0076 0109 0007 0009 0004 0005 0085 0172 0942 0358 0012 0015 0080 0104 0106
Check these codes, and select one which have maximum functionality with your TV.

Hello
I'll give you some universal remote control codes for Panasonic to check it with your remote control They are used as general universal codes for panasonic.
Three digit universal remote codes to check with are:
003/ 054/ 055/ 062/ 070/ 148/ 149/ 170/ 171
Four digit unvicersl remote codes to check with are:
0171 0148 0054 0170 0062 0374 0381 0437 0950 0003 0070

Direct Code Entry

1. Press and hold the SETUP button until the red indicator stays on, then release the SETUP button.
2. Press and release the desired Mode button (TV, VCR, etc.). The red indicator blinks, then stays lit.
3. Enter the 4 digit code from the code tables. Note: after a valid code entry, the red indicator turns off. For an invalid code, the red indicator flashes.
4. With your device on, press CHANNEL UP. If the device responds, no further programming is required. Note: If some buttons do not operate your device, try one of the other codes for your brand.

Code Search If after trying "Direct Code Entry" your device does not respond, or if your brand is not listed, try doing a search of the code library for your code by following these steps.

1. Manually turn on the device (TV, VCR, etc.) to be controlled.
2. Press and hold the SETUP button until the red indicator stays on, then release the SETUP button.
3. Press and release the desired Mode button (TV, VCR, etc.). The red indicator blinks once, then stays on.
4. Press the CHANNEL UP button repeatedly (up to 300 times) until the device to be controlled changes channel. The red indicator blinks, then stays lit.
5. Press and release MUTE to install the code. The indicator light goes off.

Most users will want to store VCR codes under the VCR button, Cable codes under CBL, etc. If you want to store a VCR code under CBL, etc., first follow the procedure for Direct Code Entry and press CBL in step 2 of Direct Code Entry, then enter ANY VCR code in step 3 of Direct Code Entry. Then follow the steps above for Code Search.

If the only thing not reacting is the audio, then the audio board or the main board has gone bad. Enter the model number and tv make on you tube to get more detailed info.

Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. In some cases, the remote control might need to clean.
http://electronicshelponline.blogspot.com/
http://remotesearch.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly.
https://youtu.be/wUpnETSm6_k
https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean]
https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]

I have the same setup like you. Direct TV and Emerson LCD TV. The Direct TV remote stores a limited amount of codes and none worked on my TV. Sadly it's not something you can update. They seem to only stick with the popular codes. Welcome to the "head of the curve" like me. lol

Did you ever get this problem fixed? Ours just started doing the same thing. It worked fine the night before, but today it's doing what yours is doing. The remote stopped working for the TV. The remote still works for the cable box, but volume and anything related to TV function not. The screen flashes when we try to adjust volume or anything else, but resets to previous volume. TV not responding to any commands either on the front panel or remote.
Any ideas? Thanks, Patti

follow wire from sensor inside tv to tuner board and resolder.

It's hard to diagnose without a model, but, given the problem I would say it is a 42LC7.
If it is, then, it needs a modification in the main PCB. We used to jumper coils at first, now we have to change the main PCB.
It's less than a year old, it's under warranty.
For a servicer in your area that makes house calls:
Contact LG at:
(800) 243-0000
If you have any questions, reply to this post and I will respond.