LG 42LW579S horizontal stripes

[Amdry]

G'day mates,

I have a LG LCD tv 42LW579S that all of a sudden developed this fault:

-on turn on this appears on screen:



Horizontal stripes, purple and green mostly. Diagonal stripes are camera artifacts, not really visible.

-after twenty seconds or so, stripes dissapear, and screen shows this:



Sorry for flash . A letter "N" can be seen ("No signal" message, probably).


What I tried: checked all elcos with ESR meter, verified all PS voltages with DMM and 'scope, reconnected and cleaned all flat connectors, knocked on the screen and boards (nobody answered), sang "Dirty Deeds Done Dirt Cheap", but no avail.

So, what do you think, what to do next, is this T-con or mainboard issue, or something else maybe?

Thanks for reading,

Regards

[Amdry]

Re: LG 42LW579S horizontal stripes

Forgot to mention...no buzzing, no overheating of any part, no smell or visible burnt parts...

[Seanl84]

Re: LG 42LW579S horizontal stripes

Hi Amdry,

Have you checked fuse on t-con? Usually found beside/near input connector. It will be marked F on board.. If it has blown it could point to t-con, though the panel could be at fault

[Amdry]

Re: LG 42LW579S horizontal stripes

Yep, that fuse was checked too, it's fine. Thank you for your answer!

[ReeceyBurger123]

Re: LG 42LW579S horizontal stripes

Hmm, have you checked all the voltage regulators on the Tcon ?

[Amdry]

Re: LG 42LW579S horizontal stripes

Oh my, I checked local regulators on main board, but not on T-con... So you think these symptoms point to T-con board fault? Guess it would be wise to replace it...

[Amdry]

Re: LG 42LW579S horizontal stripes

ReeceyBurger123, I just checked voltage regs on tcon, that's fine too...