Hi,
1. Your TV has a high failure rate with the IR module. When this goes bad no remote will work with your TV. If you still have your OEM remote try testing it to see if it is transmitting a signal. Instructions below.
2. Many universal will not work your model TV. I suggest getting an OEM remote. You ca purchase from link below. SYLVANIA NE139UD TV Remote Control How To Test My Remote Control ReplacementRemotes com
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