Replace the IR sensor...I don't have a part number for it..but I have
seen IR sensors grow either weak..or fail totally..also you'll want to
verify that the remote is working...you can buy an infrared detector
strip from radio shack for a couple bucks...all you do is push power on
the remote continuously..and hold the detector strip up to the front of
the remote..if you see a red flashing on the strip..the remote is
transmitting..if not..the remote has low battery..or has taken a dirt
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Return the tv universal remote where u bought it,get ur money back.If none of the tv univeral romote programming codes on the owner manual codes for ur tv make and model don't even work and don't have any responses for ur tv make and model functioning all.Try website like Remotes.com to buy the tv original remote or a very closed compatible clone one.
If you are sure the original remote works before and after the battery change then you have a problen with the IR-receiver of the tv set. Simple test to check your original remote is using a pocket radio, set on AM frequentie and press any botton one by one holding the remote close to the receiver of the radio. If your remote is alright it has to make a whinning sound (a high freuqeuntie pitch sound).
There are different kind of IR receiver so you need the right part to replace it. Or take the set to the shop.
Have you make sure you were sent the correct one, according to the info for the model you give the replacement remote should be a 72796929 and it's available through the partstore.com for about 10 dollars. If you got a universal or programable remote then you'll have to try the code search procedure listed in the instruction manual. If you have the correct remote(part number) then there is a problem in the IR receiver panel or the IR receiver itself. If you have a universal remote you might want to try the dvd codes also because you have the combo/TV
Sounds like a bad power board. They have random meltdowns all too often. Usually the cause is an overheated transformer caused by power transistor short outs. Possibly sell it. Could get over $100 for it if sold online.
Clean both red filter plastic windows, 1 at the remote control end and 1 at the tvs InfraRed receiver end, with window cleaner on a soft cloth. If this doesnt work you need to confirm operation with another working remote. Either the transmitter(remote) or receiver (tv) could be faulty.
Anything obstructing the IR path to the receiver located at the bottom edge of the tv bezel?
I had the same problem programming my directv remote to recognize the ssc719c. What finally worked was programming AV1 (not 'TV') with the sylvania DVD code 20821. This allowed me to turn the tv on and off and change tv channels, but wouldn't allow me to mute or change the volume. To fix this, (at least in my case) you have to program your remote to recognize the volume and mute buttons in the AV1 slide setting. I assume other (non directv) remotes similarly disable the volume and mute buttons when the remote is not in satellite or tv mode. Anyway, here are the instructions that activated the volume & mute buttons on my remote: "Depending on how you set up your remote, the VOL and MUTE may control the volume only on your TV, regardless of the position of the MODE switch. This remote can be set up so that the VOL and MUTE keys work only with the component selected by the MODE switch. To enable this feature, perform the following steps: 1. Press and hold the MUTE and SELECT keys until the green light under the DIRECTV position flashes twice, then release both keys. 2. Using the number keys, enter 9-9-3. (The green light will flash twice after the 3.) 3. Press and release the VOL+ key. (The green light flashes 4 times.) Now the VOL and MUTE keys will work only for the component selected by the MODE switch position."
To sum up: if you find a code for your remote that will turn your tv on and off, but doesn't seem to do much of anything else, it's probably the right code; your remote is probably set up not to recognize volume or mute inputs in AV1 or AV2. You change that using a remote-specific code that's probably found somewhere on the remote maker's website.