LG 42LD650 won't turn on, with standby blue led on

[maxchong2898]

Dear all,

I have got a LG 42LD650 TV that refuses to turn on when power button is pressed on the TV. I took out the power board (EAX61131701/11) that is with inverters on it (see pictures). I connected the power board to the main, connected one of the 3.5V pins to the Power_On pin, and tested the voltage outputs of pins 12V and 20V. The DMM shows readings close to the values.

What should I do next to troubleshoot the TV?

Thanks in advance!

[bil99]

Re: LG 42LD650 won't turn on, with standby blue led on

is the back light coming on when turning it on?

do you have a picture of the logic board and tcon as well ?

[maxchong2898]

Re: LG 42LD650 won't turn on, with standby blue led on

Dear bil99,

I don't see any back light turning on.
I also think that the blue led light is still there even though the power on button is pressed.
I will take some more photos when back home, and try to post over weekend

Thanks

[maxchong2898]

Re: LG 42LD650 won't turn on, with standby red led on

I checked again, the red standby light is on when connected to main power supply. When the power button on the TV is pressed, the red standby light becomes dimmer for about 2 seconds, then restores back to the normal state.
It seems that the TV is trying to start, but fail to do so

Attached pictures on the back of TV, the power board and logic board with tcon
I can't find a separate tcon board

Thanks in advance

[stormanimal83]

Re: LG 42LD650 won't turn on, with standby blue led on

did u found the solution? got same problem here but tv turns on with backlight then shuts off.

[nomoresonys]

Re: LG 42LD650 won't turn on, with standby blue led on

looks like the tcon is under the shield on the bottom? https://www.youtube.com/watch?v=xnDd_mK0q1U

[nomoresonys]

Re: LG 42LD650 won't turn on, with standby blue led on

did u found the solution? got same problem here but tv turns on with backlight then shuts off.

would probably be better to start a new thread storm, this one seems to have died 4 months ago, good luck.

[mor9h3us]

Re: LG 42LD650 won't turn on, with standby blue led on

On the rear of the power supply board/ secondary side there's two ic's a 28 pin and a 6 pin. Unsolder and remove the 6 pin ic and try the supply again if it starts and runs the ic is shorted. I have run the sets without it and no adverse affects.
Good luck finding one.
Cheers