I have a LG 42PG20D , Oct 2008 what is the problem, when the power cord is pugged in the power led is RED standby Push power button on remote the LED turns Green and a click is heard other buttons pushed on remote LED responds with a flash ?

SOURCE: lg 42" hd 1080p

This could be bad capacitors on the power supply board. My LG 42LB1DR has a known problem with this and I replaced the four bac capacitors myself and saved 5-6 hundered dollars that I was also told that it would cost to fix. I fixed for under 10 dollars and about 20 minutes. LG knows about it but they dont really want to admit it. My TV was only 26 months old when this happened. The four capacitors are made by Samxon and are 2200uf @ 10v. They are junk so even if you have the entire board replaced for say $200 its just going to happen again. They need to be replaced with a different brand.

SOURCE: Stuck in standby.

Mainboard damaged and need to be replaced, try EBAY for a general picture of prices but you will need your product code wich is located in the back of the TV next to serial number.

SOURCE: tv won't turn on - power SUPPLY OK

bad main pcb

SOURCE: wont turn on

lg has a problem with that model--usually bad electrolytic caps(most of the time the tops of the bad caps are swollen)if you take apart the unit you should see them problable in the power supply--if you dont think you can change them--contact a local shop-ask 4 price 2 change them or u can go to shopjimmy.com--enter model number--scroll down til u find power supply--if not in stock write down part number--google part number to find one

SOURCE: LG LCD won't fully power up, randomly powers down

Same here! Piece of junk! Just had it 18 months... What a waste.