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Try anouther screen . turn off, unplug, hold in the power button for 30 seconds, release plug in and try agin. this sometimes reset the capacitors on the board. can you hear the sound as it starts up also is there any lites on the back around the power supply?
When you say that you have replaced the main board i assume you mean the power board? If the green light comes on and blinks when the remote is touched it was never a issue with the mainboard, if it was you wouldnt have any signs of power. In most lcd tvs you have the main board which is normally the power board, the signal board which recieves signal and hold settings of the tv which can be all in one, the other is the inverter board, which scrambles the signal to what you see on the screen, and next we have the back light which lights the screen so you can see the picture, sometimes in certain models as i have learned you can have power/inverter boards which means the inverter and power are all on the same board, in your case i pressume the inverter board is seperate board and probably the issue you need to address, you can buy these online probably the same place you got your new mainboard from. Hope this helps pls post bach what happens.
Thanks for using FixYa. Please check the following— 1. Is Power board output +5V? 2. Is J1 (#19 in the right diagram)connector good? 3. Is DC-DC OK, check the voltage at J1 using a
multimeter. 4. Is U4 (3.3V) working ok, U4 is an IC, you’ll need an
IC tester or an oscilloscope to check this IC. After checking this if it still doesn’t
work then check P3 D-sub Input (on the D-board). See this schematic for
Please do accept the solution if the issue is resolved or else revert for further assistance.
Open your rear door and on the inside jam where the light is remove the two screws.There either a philips or torx head.Rotate out a little and litely pull the other side tabs out of the notches in the quarter panel side.Once you remove the light you will see a circut board with two more screws.Your bulbs are on the inside of the circut board.If your new bulb doesnot work,you may need to replace the circut board,there known to burn out.Hope this helps.John.
If the green lites on bord lites up doesnt mean it is ok. If you check on that board in the middle at the back of the heatsink in the middle, there is two lights, green lights that is not lighting up. If i am wright. You have caps an a transistor on your powersup that is shorted. Take to somebody to fix powersupply.