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47 LN 5400 tv picture and sound works but no back light. The LED's blink once on start up and once on shut down.

I replaced the power supply because the inductor was showing no voltage on output but had 83V input. No change so I thought the mainboard was controlling ground path for the LED's, nothing changed. I hooked some extra LED's up from a good TV and they blinked the same pattern. Is it possible I got a bad board or am I missing something? I don't think T-con would cause this???

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Fault at its main digital 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. 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.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Posted on Dec 27, 2016

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