TV has audio present. Image and menus can be seen if a flashlight is used. No backlight working. In a dark room you can see the screen flash on every 5?? seconds. The backlight LEDs are off but flash on at a steady rate and then back off again. When testing the voltage from power supply to LEDs I get over 200 volts. Voltage is the same with the LEDs connected or disconnected from the power supply. Anyone know what the voltage should be? It seems awfully high to me. Bad power supply or bad strips? Thanks, Randy
Ok so the problem is not with the power suppkly it is with the leds inside the panel they are in strings and usually only a few of them are your problem see the link for led prices http://www.shopjimmy.com/auo-t390hvn02-2-led-strips-8-strips.htm
Testimonial: "Had thought that it was the LEDs but with only minimal knowledge was not sure. I don't know why the voltate would be over 200 volts. As for ordering LED strips I have heard that they were panel specific, and have heard that they weren't. The link you provided is out of stock, unfortunately. Is basically any 39" strip useable or does it need to be matched to the panel? Thanks again."
"Had thought that it was the LEDs but with only minimal knowledge was not sure. I don't know why the voltate would be over 200 volts. As for ordering LED strips I have heard that they were panel specific, and have heard that they weren't. The link you provided is out of stock, unfortunately. Is basically any 39" strip useable or does it need to be matched to the panel? Thanks again."
Anyone know where I can get 390HVN02.2 LEDs? Haven't found any online. Thanks
Anyone? I have seen some from China but not sure if they are the correct LEDs.
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SOURCE: No back-light on LG LED TV
That means dead transformer supply chain. Replacing search not possible, donor Yes
SOURCE: I have an LG 42 TV that powers up and only shows black screen.
Chances are you have some open LED's, if one opens the entire strip will go out as they are wired in series and the power supply is shutting down the LED circuitry due to improper current or voltage
Testimonial: "Thanks Larry, I didn't want to get into replacing LEDs since it's considerable work and not the cheapest parts to replace. I was hoping for a less expensive and time consuming option."
HI...the half to volt reading your getting is that on the pins that go to the LED's in the panel? If so then remove the plug and test the voltage without the LED connector plugged in and see if you still see the same voltage or if it goes up to about 140 vdc
Testimonial: "It's at the test points on the power supply. Saw the instructions in a YouTube video. I tested with the connection removed from the power supply to main board as well."
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