Would not turn on

Look in the manual. (Page 4)

Turn the TV on From main supply: Ensure that the main supply is turned on. A blue indicator light on the front of the TV lights up. When the TV is turned on by the main supply, the blue indicator light will blink for 45 seconds. This is the lamp's start-up period. When the light goes off, press the POWER button on the remote control or power switch. Press POWER to turn on the TV.

http://www.retrevo.com/support/Philips-60PL9200D-TVs-manual/id/633ag423/t/2/

Telephone number Philips Customer Care Center: 1-888-PHILIPS (744-5477)

the blue crt has failed most likely. very common with that model.

You either have the power supply module or back lights inverter board problem, need to narrow it down.
Please see my basic troubleshooting guide here:
http://s807.photobucket.com/home/budm/allalbums
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Parts: try www.shopjimmy.com or Ebay

Power supply board it dead.That the board,where the a/c power cord plug into it.Replaced the power supply board will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

When my tv did this I unplugged power waited ten seconds and replugged it worked.

check 2 1000MF 16V Capacitors on power supply.

there is a psu fault ...usual some of capacitors r over ...need to swap by profesional

Your TV may have detected an error. Try first to have the TV unplugged overnight just to clear it out then observe it after turning it back on.