I have a Samsung CDX1342 13inch tv/vcr combo, but no remote. I have a universal remote but none of the codes are working. I s there a code I can use? I have a RCA universal remote that requires 5 digits.

None of the combo units will program with a universal remote--codes are changed from model to model and year by year.

Hello
Four digit universal remote codes for Samsung TV/DVD combo are:
0455 0963
TV/VCR combo are:
0358 0942 0942
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.

I have a Magnavox smart series Tv and none of the codes work

Made by Funai. Try Funai codes.

here are some sites with your code.

www.remote-codes.com
www.tvcodes.com
www.universal-remote.net/philipsmagnavox.html

code is 0247

Most universal remotes will not work with TV/DVD/VCR combos . Sorry!

We have a Sylvania 6313CB TV/VCR combo.  I bought a universal remote and the code would not work when I tried to program it to the "TV" button using all those possible codes listed in the books.  So, on the universal remote, there was a button named "VCR" and when I programmed in the code "0000" all worked.  This was a $6.00 universal remote named "One For All"  we bought at the Big Lots store.  
Specifically, here is what I did:
Turned TV on Pushed the "VCR" button and light blinked once Pushed and held the "set" button until it blinked twice Released the "set" button and entered the numbers "0000" Pushed the on/off button and it worked including volume, channel up/down and channel change by entering the channel number.
Hope this works for you too.

find out who sales sylvania, look at what other tv they sale and try there codes. sears is good for this to.

I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102

I had this problem with my TV/VCR combo unit (Samsung CXC1972) after losing the remote while in the dorms. I tried a few different universal remotes and dozens of codes before I tried the Philips 3 device universal remote as pictured below with code 037 programmed into the VCR/DVD button. I can't change the volume with this code but the input key switches between line in and tv. You can also change the channel, access the menu and operate the VCR functions with the code. I bought the remote for less than $10 at Walmart so it might be worth a try, and if it doesn't work you can always bring it back. Hope this helps.