I have an LG 55lx6500 UB and have no picture (black screen) no sound. Unit will turn on showing white light on front frame of tv. There are no backlights. I did the SMPS Test 1 and all checks out ok. I unplugged P201 from main board and jumped pins 1&9 power comes on. SMPS Test 2 also jumped pins 12&18 and backlights come on. On the T Con board P803 Pin 1 .20V and P804 -0.00 pin 1. The D16 on the inverter is blinking (normal) and D75 off (normal) also CN2 i get 0.00 all pins and P7901 nothing. Ive done all these tests but not quite sure what needs to be replaced. Can you help
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. 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.
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.
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