LG 42lc2d found u502 in power supply blown up.

could be power supply capacitors. see http://www.amazon.com/Repair-42LC2D-Capacitors-Entire-Board/dp/B0084F9R5M

Yes, TV's have an internal fuse on the power supply. All too often though more damage is caused besides a blown fuse or the fuse doesn't serve the purpose and the power supply is damaged. You can check and replace the fuse as necessary. If you need a replacement power supply, here is a list of vendors below. Have your TV model ready to help you find the part you need.

www.tristatemodule.com

you have shorted power transistor or mosfet on power supply that need to be replace however this need a soldering skills and electronic background if you don't have skills its better if you replace the whole power supply board.

Please check your fuse for blown and power cable for kinks or loose connection.

hello, there could be numerous reasons for this, mainly a power supply that has a fualty part or over heated circut, basically something went bad, these circuts are very delicate and they operate at very high temps this cuases circut fualts. just one bad resistor or blown capacitor may cuase this, it seems you may want to start at the power supply, the way i go about repairing these sets is by aquiring a service manual for the particular set then checking that the voltages are proper at the output terminals and check points.
the service manual for your set may be downlaodable, if your not electronically inclined you may want a service tech to check. it if your able to perform these types of checks use a service manual.

The problem can be blown up components in the back lights inverter board or in the 24VDC power supply section. You need to open up the back look to see if you can locate blown components. There should be 24vdc on one of the power supply output connectors pins.
Parts: http://www.shopjimmy.com/catalogsearch/result/index/?q=LG+42LC2D+&limit=200&stock=all

Do you get sound? I f you do, then it can either the backlight iverter board (blown surface mounted fuses) is bad or the powrsupply that supply the power to the inverter board is bad.

Hi, sounds like a power supply problem, most likely needs capacitors replaced, costs about £5 to do it yourself, and a fortune in the repair shop, easy enough if your handy or know someone who is,its worth a try,it'll be going in the bin anyway, cam

the caps dry out. look for bulging caps. you won't find a schematic for the ps boards. infocus had someone else make them. the problem seems more like a overheating issue. as for the other one with the "just the fans", check the colorwheel.

There are internal fuses - or it could be a failed PSU