Lg pdp50x3 snow picture

Sounds like a bad timing control board...Tcon...that generally causes picture issues when there is sound.

1,white spots appeared on screen,means the DMD chip is broken,you need a new DMD chip.I supply the DMD chip and the price is USD200
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Check and replace its tuner. If you wish to get some details; visit the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/

Can you post a picture that shows what snow issue is that youre experiencing that would help with diagnosis

My personal guess would be that there is no signal coming through to your tv or the wrong signal coming through. I have the opposite problem...we get picture (snowy) but no sound except that of snow and the Audio/Sound options are NOT helpful. Wish I could be of better help.

adjust vs and vsc voltages when tv is hot let tv fonction for a lease 3 hours if voltages do not fluctuate normally
replace y board

Ur backlight video board it dead,need it replaced.

lg plasma tv is not for a novice to play with. the three main circuit boards are control. y and z sustain and they are not repairable
find a shop that can replace the defective one for you.

Replace all electrolitic capacitors on the Proscan pcb.

it sound like the tuner to me here is rca part# for the tuner 264658 abour $70.00. good luck