I have a Sylvania 6420FE 20" TV and the remote no longer function

I was able to get the Sylvania TV to accept a different input (the remote was lost) by connecting the DVD to a Sony VCR using composite RCA jacks then connecting that to the TV. You'll need two 3-jack (yellow, white, red composite) cables - cheap at any store. Here;s how:
1. Connect RCA output jacks from the DVD to the input female receptacles of the VCR (first cable).2. Connect output jacks from VCR to the female input jacks on TV (second cable). 3. Turn on all equipment (VCR, DVD, TV)4. Switch the VCR to "Line 1" (for my Sony VCR, this shows up as "L1") by pressing the TV/VCR button on the VCR remote (which I did have).
Your system should now work.
The principle is to "fool" the TV into thinking that it's primary input is through the RCA composite A/V jacks rather than the cable connection. No need to disconnect the cable at any time. Any functioning VCR should work well as long as you have the remote for that device. Remember, connect output on the DVD to the input on the VCR, then the output on the VCR to the input jacks on the back of the TV. If you have the connectors on the TV, VCR, and DVD, component cables should work as easily. Remember, output from the DVD goes to the input of the VCR. Theoutput from the VCR (for which you DO have the remote) goes to the input side of the TV.
Good luck!

http://www.tradebit.com/filedetail.php/2997065-service-manual-sylvania-6420fe-color-television

hmm could that be a "sylvania 6427 gff".. i have seen a suffix of FF, GFF and GFG ... but not TE ... at any rate those are actually CRT displays .. probably the last of their kind ... they produce a really good but standard defination picture ... when you first turn it on it should come up with a setup menu ... if the cable is connecgted at the time it should find at least a few digital channels ..probably no standard channels ...most of those models do have standard and digital tuners but not sure about your TE model ...you might try unplugging your set for a few hours ... when you turn it back on it should come up with the menu system ...you will likely need a cable box to get most of the cable channels... but you may be able to get some ..you could try hookinng up rabbit ear antenna to see what local channels you can get ....

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I have the same problem. I found that there are many Comcast remotes by the way.

I called Comcast and they had no clue. But I called Sylvania and their reps were FABULOUS!!! Turns out, the TV makers send the cable companies the frequencies for each TV then the cable companies send them to a 3rd party to get the codes written.

This model of TV is new and there is no code written. The rep suggested that we countinue to check back on the Comcast website regularly to see if the code is posted. She said that the sales reps tend to get the info last.

The Sylvania rep anticipates a new code written soon because this is such a prevelant problem.

try changing the channels until you reach 2 and go past it.

Try all Funai codes too, starting from the last in the list.

During a recent move the remote was lost. I have the 6420FF in my son's room and trying to set up dvd and wi console set up, but cannot adjust tv via menu button on tv. Is there any way to set-up game system and/or dvd without remote?

HOW DO I SWITCH FROM CABLE INPUT TO ANTENNA WITHOUT REMOTE ONLY HAVE USE OF BUTTONS

I purchased a sylvanis lcd tv and it won't work with my comcast cable remote...I can't turn it on or off with it or turn up or down the volume. i've called my cable company 3 times and they can't seem to help me. Can you help?