LG50PC56 snow on screen

[24mech]

Hi there I have been given a faulty tv that I (cost permitting) would like to fix as a bedroom TV the issue is as in the pictures snow or white noise on the screen no input connected when picture taken, has this issue been seen before? any help would be greatly appreciated thank you.

[Biruslapio]

Re: LG50PC56 snow on screen

Bad solder joints on the big filtering inductors on both Y-SUS and Z-SUS boards cause some plurple tint on the image, but yours are way more severe, these photos are quite the poor angle and resolution, but the TV seems to be displaying correctly the menu, bright enough to not be Z-SUS failure.
Open the TV and take measurings from the test points on the boards.
There's a sticker on the panel on the inside, it shows which important voltages need to be at what value. VSUS(PSU), VA(PSU), -VY(Y-SUS), VSCN(Y-SUS), Z-BIAS(Z-SUS).

[24mech]

Re: LG50PC56 snow on screen

I'll get some better pictures and try to play a video source to help with understanding my issue thank you for responding.

[24mech]

Re: LG50PC56 snow on screen

I've uploaded some more pictures, I tried to play video source and all i got was the pictures attached no real image to see just white noise, thank you for your help.

[Biruslapio]

Re: LG50PC56 snow on screen

No real image? when you plugged in something into HDMI for example, only "no signal" was displayed?
Whatever method you're using to resize your photos is ruining the picture quality.

I sugest you remove the back cover, and start probing with a multimeter those voltages:
VSUS(PSU), VA(PSU), -VY(Y-SUS), VSCN(Y-SUS), Z-BIAS(Z-SUS).

If they're normal, within spec, next you would need to remove the boards from the TV and check for bad soldering on the inductors I mentioned.
I've also never seen this issue before, if someone else has, they could just point the cause immediately.