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Hello, I'm Shahid.Sorry to hear that you're having trouble with this but I'll do my best to help.
- Did you get identical power and main board and bought from reliable source?- Can elaborate 'beeping noise' with bit more details?
I'm sorry, phone call may not help at this early stage, please reply to requested info to troubleshoot the problem.
Did you get the part number off of label pasted on main board?
Different version of main board could be cause of trouble, however, what is the serial number of your TV?
Also, is there any change in TV symptoms with new main board?
This is not good news, do you see any small sticker on side panel of TV for model and serial number?
I'm sorry, non of those numbers look serial number. Let me repost the question for other experts to have a look.
I'm opting out to repost the question.