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The led driver AND the T-con board are bad. If you could see a picture with the flashlight then the T-con board would be good. It is not. The led driver can be on the main board or the power supply board. You can get these parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
I looked in the online manual and their troubleshooting section was pretty weak. Go to this website and scroll to the bottom until you find live chat. They should be able to help you this way.
Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.
These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/ http://electro-medical.blogspot.com/
Blinking codes details of many popular brand TVs are given. Surf the site with patience.
If blinks continue without any pause, the main board is faulty.
Most likely one of the Buffer PCBs on the left side, the part numbers vary; you will find those part#s , price & availability listed in the following web site: http://www.shopjimmy.com/catalogsearch/result/?q=LG+50PQ30-UA&restrictBy[master+part+type]=Buffer+Board&restrictBy[known+models]=LG+50PQ30-UA
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