NotTaR of Television Sets : TV shuts down with bright picture or whe..  
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TV shuts down with bright picture or when brightness is turned up

This is probably a protection circuit kicking in especially if turning power off or pulling the plug is required to restore operation.

The detection circuit could be in the power supply or horizontal deflection output circuit. It may be defective or the current may be too high for some other reason. A couple of tests can be performed to confirm that it is due to beam current: