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Tv is not powering up


My tv model is 42LW5400

When i press power button on remote i hear a sound from back and red light blink slowly ,

when i press buttton again it stays red.

Idont know if it is power supply problem or main board

but i think the sound comes from power supply.

if anyone can help me please di it.

Thank You !


Thank you for your answer.

I tested power supply and i found a problem

The first pin is 3.4v it reads power-on 24v

is normal the tick sound in the selected part? it does when i turn on or off tv.

And how can i fix this voltage problem?


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The power supply is ok i think is board problem ,

when i see closer i hear a sound like electric sound in part 1 or 2 im not sure.

Is any way to repair the board?

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Answered! View the answer I have this problem too

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It will be difficult to find the right tuner. You may need to replace the board.


can you help me to find a compatible board or is posible to to change with a smart tv board?

Thank you !


Stick with the original board. Looks like part number EAX64290501(0)


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3 Answers

Chosen Solution

Serafin, to really make that determination, you would have to check the voltage output of the Power board. If those are within normal range, then the error is most likely the main board. From what you are describing, I'd start with the power board.


Pin 1 Power on

Pin 2 20V (24V)

Pin 3 20V (24V)

Pin 4 20V (24V)

Pin 5 Ground

Pin 6 Ground

Pin 7 Ground

Pin 8 Ground

Pin 9 3.5V

Pin 10 3.5V

Pin 11 3.5V

Pin 12 3.5V

Pin 13 Ground

Pin 14 Ground

Pin 15 Ground

Pin 16 N.C.

Pin 17 12V

Pin 18 Inverter on/off

Pin 19 12V

Pin 20 Lamp: A-dim LEC: N.C.

Pin 21 12V

Pin 22 PWM Dim #1

Pin 23 N.C. or for the Lamp scanning Model: PWM Dim #2

Pin 24 Error out

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Do the LG TV's bring a fuse to protect the on and off power and where it is located. Thanks guy

My TV (LG 46') stopped turning on /off with the remote control or by hand. It does nothing at all.

What part should I replace to reestablish functionality and where it's located?

Thank You


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What should the 'power on' voltage be? I havr a similar issue and the voltagr im getting is also 3.4V. Not sure if tjis is correct or not.



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Serafin will be eternally grateful.
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