Main board is the problem, www.shopjimmy.com will have the part you need.
Testimonial: "Thats what I thought you meant thanks"
sorry main board meaning the power board of the logic board?
or the*
No. The board with all the inputs and tuner. This board controls the power supply board.
Did this fix your problem I have the same issue
Did anyone figure out which board it is that's causing this? I just replaced the power supply board and that didn't fix the problem. Any help would be appreciated...
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Check your other voltages coming out of the power board and see if they drop off when the set shuts down, all the 5 volts does is supply standby voltage and that should be there all the time even if the set is off. A suspect on this set is LED lamps in the panel but it could be other things as well
Front Panel Header pin assignments as follows:
Pins 2 + 4 = Power Led
Pins 6 + 8 = Power Switch
Pins 12 + 14 = LAN Activity Led
Pins 1 + 3 = HDD Led
Pins 5 + 7 = Reset Switch
Pin 9 = +5v
Pins 11 + 13 = ODD Led
Pin formation is as below with no pin in position 10.
2 4 6 8 10 12 14
1 3 5 7 9 11 13
You will probably need to extend the Front Panel connector cable to reach the header pins on a replacement motherboard - I did this with 2 x N76HL 10 pin extension cables (male to female) from Maplin.
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I replaced everything! All cables and All boards! Same thing! Do not buy any parts. Does the same splash screen and goes back off. Been to a lot of sites where nobody was able to fix it. I think it was a Chrome cast update that bricked the TV. Lot of user from 11/19 to 4/15/20 have the same issues. With the cost of power board or main board lots of people have just bought a new TV. I paid $100 for ALL the components from a broken screen 55L621U. Tested each component as I switched them out (even pwr/imput button, wifi, 3 boards, and all wires) to no avail. Power on splash screen the black screen and power off. No support on this one. Best Buy 389 for a new one.
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