If you don't have a remote, your TV should have a built-in "Menu" button. Find and select the "Channel Scan" option in your TV's menu. This option is sometimes labeled "Rescan," "Tune," or "Auto-tune." If you can't find the "Channel Scan" option, dig through the TV's "Settings," "Tools," "Channels," or "Options" menu.
https://www.howtogeek.com/424853/how-to-scan-or-rescan-for-channels-on-your-tv/
SOURCE: How to Auto tune remote control for 1993 Magnavox
I have an older RCA universal remote control and a magnavox tv from 1993. According to my universal remote user manual (which I found online) I punched in a three digit code: 062 that worked for me, for my 1993 Magnavox TV: hope this helps!
If not, here are some others to try from my RCA universal remote user manual for Magnavox tvs---
004, 006, 008, 019, 068,069,074,075,076,077,088,089,130,131,132,133,134,183,184.
had same problem and googled it han found codes to reset my remote. might try that. Good luck
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