Both PS and Main Boards were Cleaned
This is normally caused by a bad component in your power supply circuitry. It is also known to happen when your secondary power array (the inverter array used for the backlighting of your lcd screen) is going bad by means of being out of the correct voltage parameters. This function is controlled by an IC chip that constantly monitors the voltage across 8 inverters all working in synch. When one of those inverters produces a voltage level that is not within the tolerances it recognizes as correct, it will shut your tv off to prevent any further damage to any other electrical components. So unless you are familiar with working on electronic components and have the tools and equipment to do so, I recommend that you have it checked out by an expert.
SOURCE: LG 42PC3D-UE Turning on, clicking, then turning off & repeat
replace the power supply it is a simple fix if you can hear the relays click 2 times or more replace the power supply board you can order them from UNION Electronics ask for kyle when you call ,,if the power supply isnt the problem then it will be the control board located below the power supply board I have repaired a few of these the voltages are marked on the power sullpy board conections be careful there is a VERY HIGH AND DANGEROUS VOLTAGE FEEDING THE X AND Z BOARDS DONT REMOVE THIS WITH SET PLUGED IN IT IS HOT ENOUGH TO BURN A HOLE IN YOUR SKIN AND EVEN DO MORE DAMAGE TO YOU if your not sure what to do Call LG they have a good support theam there
Dave
Daves Tv
SOURCE: 61" plasam TV will not turn on
This is one of two problems, Bad capacitors in the power supply or your Y Sustain board has failed, I would go for the first, take the back off your tv and look for swollen or domed shaped capacitors on the power supply, They may also leak a brown liquid like substance.
Replace all that you can see and this should cure the fault.
SOURCE: 42 in LG LCD TV turns off by itself
Found that TV started switching off by itself. Would try to come on..green light blinked for 2-3 seconds, tv came on (with picture and sound) for 1 or 2 seconds and then it would turn itself off. Found that the issue is with one channel only. If you are facing this issue....try quickly changing the channel the moment it comes on. You can do it either with remote or with the TV buttons directly. also in the same logic, if this is still happening, try changing the source to another (rgb-pc, av1, av2 etc). Basically change it from whatever input it is on currently, if changing the channels does not work. My symptom was that the tv made a loud 'TIK' 'TAK' sound which is louder than normal.
SOURCE: LG 50 PS 3000 tv will not turn on. Flashes a
Since your TV comes on and shuts off, the possiblity of the main power developing a fault on switch on to shut off as the error amp is asking it to do so.. Please check for any failure of capacitors in the HT section. use a multimeter and test voltage on switch on. make a note and test after it switches off. you will slowly arrive at the point of trouble. look for dry solder joints. use a good iron to carefully solder all joints suspected to look mushy. check the connectors of the HT drives to the panel. there could be fault in the connection resulting in slow build up and causing the error amp to react to shut off. Hope my advice helps. Good day
This is the picture of 1801. Both boards are entirely different to each other. How can it be repalced? 
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