Re: LG 55uj6200 wont turn on



Inv on is 3.2volts turned tv on
Inv on is 0volt tv turned ofi suppose invon you meamt and i found only on the connector going from power board to main board...

Re: LG 55uj6200 wont turn on



How can i check if the mainboard sends that logic signal? Is ot possible the mainboard is not doing this?
Is there a reset function i could trigger to restart the voltage flowing to the leds again?...

Re: LG 55uj6200 wont turn on

Therevis no voltage in the led connector at all. I checked the two transformers. The smaller one input 12v i measure 0. On the output of 18v and the two 400v connection i get 0v AC. Same measurement on both the old Nd the new power board.

Re: LG 55uj6200 wont turn on

Hi. I got the led tester. I found two led on one strip coming on slow. I replaced all the led strips now. With the led tester they all come on and sho 68v going thru both strips. Reassembled the tv. When power on tv still no backlight come on, but i have sound, and with a flashlight i confirm tv has the menu showing.

Re: LG 55uj6200 wont turn on

I will re-assemble tv tomorrow to check the flashlight check for the main board. I connected all the new led strips with the same problem, non will light up. What did you meam by inv on voltage? I had tv powered on and off with the same results measuring only under a volt on both led+ with the minus connected to ground using the tv housing.

Re: LG 55uj6200 wont turn on

Hi guys. I have similar issue as microvibe, no picture but hear sound. I tested the led strips and found one bed led. I replaced the led strip. When i powered on the tv backlights still didnt come on. But when i swithed it off half the strips flash once. The other led circuit doesnt respond at all.
I checked the voltages. I got 13.2 volts going to the mainboard but no voltage measured in connection to leds.
I purchased a new powerboard. When i power it on without leds or main board connected i still dont measure any voltage to the led...