Chosen Solution
Hello Community, I have an LG from a year ago and today, it randomly turned off and the screened stayed black with the back-lights on. After diagnosing and researching online, it was either a bad inverter or capacitor, which are both located in the power supply board so I just decided to replace the t-con board, the main board, and the power supply board to be safe. It doesn’t cost as much as a whole new tv. They were purchased off tvpartstoday and the condition was new. After installing all three brand new boards, the LED still blinked three times and the screen was not displaying the LG logo. TV with new boards displays: standby: 1.9V Operating voltage: 13.1V When I unplug the back-lights the voltage measurements do not change. When measuring the 4 pins on the LED pins I get: LED2 - : 3.6 LED2 +: 132V LED1-: 5V LED1 +: 198V The TV’s back-light are mainly shinning on the left and right side of the tv, the middle is pretty much dark. I’m not sure if that can help solve the issue, could it be s trip is bad?
Hi @ericlg I’m assuming that the LED voltage measurements are between the pins and Earth, is this correct? Did you try measuring between LED1+ & LED1- and LED 2+ and LED 2- to see what it measures? I would check that all the strips are working OK. You may have to access the strips and check that the power is getting to or through the middle LED strips. Try using a TV backlight tester to make it easier. That way you won’t have to have power on the TV to check the LEDs and you won’t have to disassemble the TV to get to the LEDs if they all work when a tester is connected to power them. If they all work with the tester it is back in the power board. If they don’t it’s in the LED array somewhere
