When the TV power is turned off with the remote control, the STANDBY indicator will remain illuminated to signify that the TV is in the standby mode. This is normal operation.
NOTE: On some models, turning the TV off using the POWER button in the front of the TV will disable the main power and prevent the STANDBY indicator from illuminating. Refer to your manual for model-specific information about the capabilities of your TV. Manuals are posted on your model support page.