I have a HP HD 52" tv, ek430pp. The remote continues to come up on screen automatically and change my source and also lower my volume to -0-. Removed battery from remote, unplugged tv from wall. This is happening anywhere from 10-25 times during a 1 hour session.

You can't reset it you have a sound problem circuit that needs to be fixed by a qualified tach.

My sceptre tv just started randomly changing through input modes, sometimes once or twice before stopping and sometimes it continues

you may fave a faulty switch in the key controller, may best advice is replace it


Part numbers:
KC792
XC792WJ


Fred

Try jammed keys on the remote control best if you take battery out the remote and operate manually and see what happens

what you describe is almost impossible ..the only explaining is someone with a compatible remote control messing around with you ..so ...pay attention ..and after that if you are completely sure that this is out of case...Leave a comment and I will search for another possible cause ..

Try this.....

Turn cable remote volume all the way down. Raise the volume all the way up with your TV remote. Lower the volume with Cable remote to your usual listening volume.

dear, you have to check your +button whether it is holp the egde of your remote, open your remote and clean, and also check a button on tv for +volume button. there is a pulse condition sensed by the volume control stage. if you can manage do it, or take it to a technician.

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/
http://homenol.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]

Check if the remote is in TV position, that is, because most of the remote controllers have the feature that you can program them for use with another devices. Make shure that one button that says "TV" in pressed and released once before you try to change any function on the TV.

Sounds like one or more of the keypad buttons are sticking - That would also cause the remote control to stop functioning.When you saw "P:0 V:0" you somehow managed to put the tv into the service menu. Pull the keyboard away from the plastic buttons and make sure nothing is in the way.