LG 60pb5600. Second time I've heard a pop, this time it died. I heard a pop and the power LED light flashed on and off. Turned the tv back on, it turns on for a second and then goes dark.

SOURCE: No Picture & No sound. Red LED, Green LED, Red LED.

If the power supply outputs are good! Then I would say the back light inverter is bad! If the screen stays black and does not come on.

SOURCE: LG L1715S TFT power issue

Change out C202- 680 uF 25 Volt electrolytic capacitor. Replace with 25 volt or higher. Observe proper polarity when replacing cap: (-) goes to the side with the black mark, check old cap before removing it to see. I just fixed the same monitor today.

SOURCE: Tv will not power on!!!

most likely will need a new power supply, google it

SOURCE: LG 50 IN. PLASMA TV MODEL # 50PC1DR . POWER

Power supply board is dead,replaced the power supply board will get power.

SOURCE: LG 42 Plasma try's to turn on but just goes back into "stanby" ?

Check to see if you get Va and Vs voltages from the power supply. There should be some wires running to the y-sus. A couple of those wires will be labeled va and vs. Are they present? There will be a sticker stuck to the panel somewhere telling you what they should be.