There are lots of meaning of CST, it could be:
- Central Standard Time
- Computer Simulation Technology
- Cell Signaling Technology
I'm not sure, but I have not heard of TV that requires to have a time settings. If the TV needs it, then it could be the Central Standard Time.
However, flashing light could mean that there is a lamp failure that shuts down the high voltage supply to your screen.
Check back lights ( there are small diameter lamps behind the LCD screen). Replace the defective back lights and that should fix the problem.
But if you're not sure about checking it, I would suggest to contact the manufacturer or a local repair shop and have them repair it.
Good luck!
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