JVC RM-RK50 vs JVC RM-RK52 what is the difference?

SOURCE: Opening the case of a JVC Remote Control

Not having seen that particular one, remote cases usually have a couple screws under the battery to lock the case together and then a number of plastic tabs around the perimiter that hold the joint closed. find the screws (sometimes they hide them under labels) - I don't know what it is about screws that manufacturers don't like to show. Either think they are not cosmetic or don't want us take-it-apart maniacs to get in. Anyway, get the screws loose then (this is the hard part) carefully pry open the case joint, feeling where and how the tabs snap out and then be careful not to have everything inside go flying when the last one lets loose. Almost impossible to not leave little gouge marks in the joint.
Hope Ya Fis It!

SOURCE: Remote control

You need to resurface the contacts. Here's how you do it:
First, disassemble the remote. Clean the black foil pads on the circuit board with rubbing alcohol. Now take a #2 pencil and a razor and shave the graphite from the "lead" onto a piece of paper (hold the blade perpendicular to the lead, this results in a finer powder). Now that you have a nice pile of powdered graphite, blot a Q-Tip into it to saturate the cotton with graphite. Rub the graphite onto the little black pads on the rubber button membrane, and be sure to apply more graphite to the Q-Tip every 2 to 3 buttons. Blow off any excess graphite. reassemble remote and test.

SOURCE: Problem to program my remote control

Try using the guide to help you with this problemm if you dont have one, try going to a local store that sells this product.

SOURCE: REmote control RM-C1257G not working even after trying new batteries

Try this

1. Get camera phone
2. set camera phone to to take picture
3. point remote at camera and look at the camera display
4. press buttons on the remote, you should a light from the Remotes IR.
5a. If NO light is seen, your remote is broken. you can try replacing the batteries to double check
5b. if Yes, light is seen. Your remote is working and you may have a problem with the TV.

As a double check, get a remote you know is working and try the same thing to verify that you are checking the remotes correctly.

SOURCE: codes for cybertec RM-312x remote control for JVC

1515, 1516, 1646, 1717, 1733, 1743, 1827, 1829, 1832, 1031, 1064, 1065, 1073, 1075, 1081, 1095, 1099, 1112, 1114, 1164, 1166, 1191, 1205, 1264, 1268, 1313, 1332, 1333, 1414, 1456