Programing an RCA universal remote to your TV isn't hard, but the generic code tables make it annoying. Here's what actually works.

The remote needs a code that tells it which infrared signals to send for your specific TV brand and model. RCA remotes come with a code list, either printed in the manual or available online as a PDF. The basic process is straightforward: enter the code, test the power button, and if it doesn't work, try the next code in the list. That's the theory anyway. Real life is messier. First, find the code list for your remote model. Most RCA remotes are part of the "RCA RCxxxx" series. The code you need will be in the TV section, grouped by brand. If you don't have the paper manual, search the RCA support site for your exact remote model number and download the code sheet. I keep a folder of these on my phone because the paper versions always get lost. Here's the actual programming sequence for most RCA universal remotes:

Turn on your TV manually. Hold down the SETUP button on the remote until the big indicator light at the top turns on and stays lit. Type in the four-digit code from your code list. The light should blink once to confirm entry. Point the remote at the TV and press POWER. If the TV turns off, you're done. Press SETUP again to lock it in. If the TV doesn't react, you either typed the wrong code or that code doesn't apply to your specific model. Try the next code in the list and repeat. The auto-search method is the backup when none of the listed codes work. Hold SETUP until the light stays on. Press and hold POWER until the TV turns off. The remote has now found the correct code. Press SETUP to save it. This usually takes between 30 seconds and two minutes depending on how many codes the remote cycles through. I ran into a real problem with this a while back. I was programming an RCA RCU100B for a Samsung TV from around 2012. None of the Samsung codes in the manual worked, and the auto-search kept locking onto codes that controlled the DVD player next to it instead of the TV. The workaround was to point the remote directly at just the TV's IR sensor and cover the DVD player with a towel while running the search. Once the TV responded, I pressed SETUP immediately to lock that code before the remote could drift to another device. It sounds fiddly but it works every time.

There are a couple of things people miss about this process. First, the code lists are often wrong for newer TVs. RCA code tables tend to lag behind manufacturer changes, so if your TV was made after 2015 and none of the codes work, that's normal. Second, some RCA remotes have different key combinations for entering code mode depending on the model. The SETUP button method covers most of them, but a few older models use a DEVICE button combined with NUMBER buttons instead. Check your remote's label for any model-specific notes. The biggest limitation is that universal remotes don't support every function your original remote had. Volume and channel control usually work fine, but things like input switching, smart menu access, and voice commands won't carry over. You'll still need the TV's original remote for those features. Also, if your TV uses ARC audio over HDMI, the remote won't control the soundbar volume through the TV signal. You'd need a separate soundbar code or a dedicated device entry in the remote for that to work. If the standard methods fail completely, there's one more option. Some RCA remotes support direct brand code entry without a four-digit code. You hold SETUP, then press and hold the brand button for your TV type until the light blinks twice, then press POWER. This sends a broad brand-specific signal that works on many TVs where the coded approach doesn't. It's not guaranteed but it's worth trying before you give up.

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How to Program an RCA Universal Remote? [ Sample TV RCA Remote Codes? ] @smart4homes - YouTube
How to Program an RCA Universal Remote? [ Sample TV RCA Remote Codes? ] @smart4homes - YouTube

The code list PDFs are available directly from RCA's support website. Search for your remote model number followed by "code sheet" and you'll find the official document. Third-party code lookup sites exist but the RCA originals are more reliable since they get updated when new codes are discovered.