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Hi Assuming thar you can open the tv case and deal with electronic parts, you should first check the main fuse. If it is OK, check the anti-surge resistor (generally 3,3 Ohms/5W). One of these components may be bad. Before replacing the bad one, check for short in MOSFET power switching transistor, fast output rectifier diode (+ or - 90V line voltage). After findind out the culprit replace the bad components a afterwards plug in the tv and test.
if you see near plug it might be due to sparking in socket or plug by calling electrician it might be repaired easily.
But you have seen blue light in tv & chattering sound than it is dangerous.
do not put on tv &call skilled person.
It sounds like you have an arcing solder connection somewhere in the power input to your TV. This is a loose connection somewhere.
You might confirm this by jarring the set while it in operation. (Not too hard)
If the problem shows up then a loose connection is confirmed.
Also a component may be breaking down internally.
You need to have a tech check it for you.
The set is what we call squealing because the power supply is sensing a problem and is screaming for help but that could be a good sound for a technician to find the problem fast and correct it inexpensebly.Keep it unplug to prevent more damage.