Question about LG 50 Inch LED TV 50LN5200 LN5200 Series HDTV
Usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs
Posted on Mar 22, 2015
Can you see the the screen flash brightly when tv is first switched on and then immediately go black?Does the red led standby light then slowly flash twice? If these are the symptoms then I can only tell you that this is the fault I had on my LG .47ln540v tv.I replaced the main board,psu board and t-con board all to no avail.Finally i stripped down the screen assembly and found the problem was caused by a faulty backlight led. Apparently the electronic circuitry monitors the supply to the backlight leds and if it detects a problem it shuts off the supply and goes into a "safe"mode to protect the remaining leds from receiving to much current.One my tv I can only deduce that standby led light flashing twice is a blink code for a faulty backlight,but I could be wrong. Although I am not a tv technician I know enough about electricity to safely work on some repairs,but I cannot recommend others to do the same,there are some capacitors on the psu board carrying high current and charge and could be lethal even when power is disconnected from the tv.I managed to get a replacement led backlight strip from a damaged tv of the same model.It took me about 5 weeks to troubleshoot this fault.Hope this helps someone.
Posted on Mar 19, 2015
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Posted on Jan 02, 2017
SOURCE: lg led tv backlight
Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Posted on Feb 05, 2015
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