My 42" POLAROID LCD TV IS NOT QUITE TWO YEARS OLD AND TODAY IT STARTED TO BLACK SCREEN WHILE PLAYING AND YOU CAN STILL HEAR THE SOUND. WHEN YOU SHUT IT OFF AND BACK ON AGAIN IT WILL PLAY FOR A WHILE AND DO THIS ALL OVER AGAIN. I KNOW SOMEONE ELSE HAD THE SAME PROBLEM ANY SUGGESTIONS AND AMOUNT OF MONEY IT WILL COST TO FIX?

I just changed out the invertor boards and mine was fixed. I had the same problem. Im not a TV repair man but replace the board thats buzzing and it will work again.

The cost of getting this plasma fixed is not costwise compared to getting a new TV. I recommend NOT to get another plasma but get either an LCD or LED for the best quality compared with price. Plasma parts can be quite expensive especially for a 10 year old model or may not be available.

Well it very well could be the three color tubes, or power board the problem. BUT before you try that check your HDMI cable. HDMI cables have to be 100% in to fully work sometimes if out just a bit they will produce this issue where you have no picture but sound.
Or try a new HDMI cable, if you don't have HDMI and it's doing it on multiple ports including RCA, RF, HD Component then it's a problem with the tv itself and you'll need to call a repairman.

Check the power supply and the back light inverter board.
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com

I would take it to a repair shop, but it sounds like somewhere in the power board.

Must return for waranty repair ur main video board backlight is dead,the main video board no good.

I have a 3 year old TV with the same problem as shema_ross.

i had the same problem. i opened the panel in the back of the tv (3 screws) and opened the aluminum panel (3 screws). there's a red led light located at the bottom left corner of the top board. to the right of the led light, you will find this thing with 4 switches. i turned the two bottom switches "burn" and "epmw" to on. so far tv have been working.

Examine the electrolytic capacitors on the power supply circuit board. If they have vented, then replace them with premium quality units such as Panasonic/Matsushita from Digikey. Should restore your power supply immediately and eliminate this problem for many many years. Estimated life 5-10 years. About $10.00 in parts.

Best to replace ALL electrolytics on the power supply to ensure a long life TV.

check out the link below ... sounds like a similar problem:
http://www.dslreports.com/forum/r20889230-Samsung-LCD-TV-No-Picture-but-has-Sound