LG- 42LK450-UB.CUSY.LH Snowy Display

[kylekasey]

History: I replaced the Main Board and Power Supply. The TV now powers up but the display, including menus, is snowy. I replaced the T-Con board and that had no effect. The power-up screen / time screen is clear which makes me think the screen is not damaged. Could I have gotten a wrong replacement main board? firmware? Any help will be appreciated.

Original Main board : EBU61369602
Replacement : EBR73308816

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Can we see the time screen? Odd that the main menu is affected but not the time screen?

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Very bad picture, but it flashes off so fast its hard to catch it. But the LG and blank time are clear with a solid black background. Then the "no signal" animation starts with the snow..

Thank you for the help!

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Hmm... If you turn down the TV's backlight or brightness setting does it reduce? (crazy idea)

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Changing the brightness has no effect.

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Does that mean it could be the main board?

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

It looks like a main board issue to me, but first I would try a factory reset:

Hold MENU on TV and MENU on remote. Hold for around 10 seconds.

If password prompt shows type 0000 or 1234.

When the service menu appears, select the RESET option.

[truep]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

I had a 32" samsung that had a similar problem. The previous owner had replaced the main board with one from a 46" set. He used the number on the board, not the one on the sticker. Maybe the same problem?

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

I had a 32" samsung that had a similar problem. The previous owner had replaced the main board with one from a 46" set. He used the number on the board, not the one on the sticker. Maybe the same problem?

That is my thought too. The board with matching numbers was for a 42lk520 not a 42lk450.. If the factory reset suggested above doesn't work I will order another board and give it a shot. I also wondered about a firmware issue. This model came with either a VA or IPS screen...I am not knowledgeable enough to understand if that would be a factor.

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Can I access the service menu with an after market remote? I don't have the original.

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Yes, as long as it has the MENU key on it.

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

I have the factory remote, but I am still unable to access the service menu. I tried holding the remote menu button + TV menu for 10 seconds.

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

OK, let's try the alternate method. Open the main menu by pressing MENU (on remote or set), release the key, then hold MENU on the set. If the menu goes away, try opening the menu again but repeat with MENU being held on the remote control.

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Sorry, that method did not work either.

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Hmm, in which case, this might be a sign the main board is bad in some way or the combination is different for this set.

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

ok I can bring up the password screen. I used the IR LED attached to my cell phone trick. 0000 or 1234 did not work...

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

I can NOW access the SERVICE MENU Password: 0413

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

OK, do you see a "Reset" option?

[kylekasey]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Sorry I have been sick a few days. I see all the Tool Options but no RESET.

[tom66]

Re: LG- 42LK450-UB.CUSY.LH Snowy Display

Can you post a picture of the service menu?