LG 47LN5700-UH - LED backlight issues Goto page Previous 1, 2.
Check standby voltages of 3.5V OK, closed 3.5V to PWR-ON circuit, 12V and 24V rails OK, closed 3.5V to DRV-ON and got 76V at LED driver output, closed 12V to PDM1 and another 12V rail to PDMI2, LED output over 150V and then drains to 76V.Find helpful customer reviews and review ratings for LG Electronics 47LN5700 47-Inch 1080p 120Hz LED-LCD HDTV with Smart. TV kaput. Gave me 4 years of service.I know your the veteran and I respect that but I do not think you are listening, if the LED panel is not hooked up it still does the same thing, leading me to believe it is a problem with the LED driver circuit.
You are correct that the main board handles the switching, I am not hooking anything to the PWM dimming circuit for whatever unknown reason to you, I am manually switching circuits on in the power supply and LED driver to troubleshoot the board because the LED driver output voltage is too high and then shuts itself off thus causing the backlight issue.Tv operates normally including sound and changing inputs using a flashlight to see the screen except the back light comes on and goes off and by closed I mean connected and no relation bjlasota and your the same guy from the other forum SMH and LOL.
Download 42LN5700 manuals,. 55LN5700-UH 50LN5700-UH 47LN5700-UH 42LN5700-UH.This Service Manual can help you recover, restore, fix and repair LG 42LN5700 (CHASSIS LT33B) TV.I am going to get a new board and I will take pictures for posterities sake of old and new just to show the Vet that it is not a problem with the LED panel.
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Google Book Official Lg 42ln5700 Uh Service Manuals And Repair Guide Summary Ebook Pdf:. 42ln5700 uh service lg 47ln5700 uh smart led tv official factory service.If there is any more information you need please feel free to contact me and I hope I was specific enough without sounding like too much of a NOOB.LG-47LN5700-UH Smart LED TV Official factory service, repair and workshop manual.Lg 47ln5700 Uh Service Manuals And Repair Guide Ebook Download,.