LG tv switching to standby LG-RZ- 17LZ10

November 1, 2021
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Hi I have an LG-RZ- 17LZ10 lcd tv which is switching to standby 2 to 3 seconds after switching on.External 12volt s.m.power supply is testing ok and I`ve substitutued it with a 12 volt workshop supply.Any help would be much appreciated,Isuspect it`s switching to standby due to it detecting a fault?