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Equipment Repairs => LCD TV forum => Topic started by: call me al on December 05, 2019,08:41:10

Title: lg 55uh615v
Post by: call me al on December 05, 2019,08:41:10

Hi all Have this LG 55UH615V no backlights its edge lit only two years old,have pulled it apart and the leds seem to be ok.Am wondering would it be main board issue and would it be worth cooking.Any suggestions very welcome

Title: Re: lg 55uh615v
Post by: downunder on December 06, 2019,02:55:21

Hi Al, LGs often suffer from main board not supplying INV-ON signal to power supply to turn on the backlights. So locate the INV-ON pin on the power supply connector and see if indeed 3.5V is present. If not, a cook up should solve the problem.

Be wary of LED testers - they only supply about 30mA to the LED strips which in a working set use around 300mA. So a faulty LED may not present at such low current. But almost certain to be the main board. Some of them, especially the LW series, do not respond well to cooking.                                   Bruce

Title: Re: lg 55uh615v
Post by: call me al on December 30, 2019,15:27:38

Hi Bruce Apology for not replying earlier ,cooking did the trick many thanks and best wishes to all for 2020 :party0036:

Title: Re: lg 55uh615v
Post by: downunder on December 31, 2019,02:02:51

Thanks for the feedback, Al, and a happy new year.           Bruce