Since you didn't specify model number:
Problem: No power or indicator light.
Possible cause and solution:
The TV is not connected to the power.
Press POWER at the side of the TV or on the remote control.
Ensure that the AC power cord is connected tightly to the TV power connector and to the power socket outlet.
Remove the AC power cord from the power socket outlet, wait 60 seconds and reconnect the AC power cord.
Connect the TV to a different power socket outlet.
Failing that you will most likely need a repair.
Contact Philips to confirm.