Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. It will be best to buy a new one, rather than trying to repair this TV.
If you live in the US and the TV doesn't have the newer ATSC (digital) tuner, you're lucky to get 3 channels! The only analog broadcasts left in the US are "low power" & "translator" stations. The old NTSC analog tuners in TV's from just a few years back have little to tune since broadcasters have been moved and changed from analog to digital as directed by the FCC in 2009.
I hope this helps & good luck. Please rate my reply. Thank you.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Unlock procedure and to override the password lock to many popular brand TVs are given.
Question edited for clarity and add CAPS.
To update the software, it has to be connected to the Internet, and it sounds like there is no internet connection via the television, so it is looking for a USB Cable to a computer.
https://www.google.com/search?q=ematic+at103b+update+the+software+version
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