I was watching my tv and it suddenly went totally black. I can hear it ,change channels and use the column but still no picture. What problem would this be?

SOURCE: Tv has lost two outer sides of vision despite changing picture mode

That's either a high voltage problem, or a deflection problem. WARNING, CRT Based Televisions have potently life threatening voltages inside them, and should be serviced by trained personnel only. With that out of the way. According to http://www.repairhelper.com It's a capacitor failure Fault - Width and E/W correction fault Remedy - Replace R626 and C630 I don't have a manual so I can't tell you for sure what the resistor and capacitor do, or where they are located.

SOURCE: BLACK SCREEN, AUDIO OK

I have samsung 40" LCD tv and it's happening the same thing. I turned it on and it last for 5 minutes and the screen went back but the audio is fine. I turned off and turned it back on it worked fine but an hour later it happen again.

SOURCE: 42px5d got sound but no picture

You need the Y sustain and y drive boards. No idea where to purchase in australia, but you may be able to order them from LG.

SOURCE: No picture, sound ok

I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.

SOURCE: No picture on my Toshiba 42HP66 plasma tv.

I too have this problem with no help from hh Gregg, where I bought the tv, and no help from Toshiba. I resorted to calling the BBB and complaining about the defective workmanship. I took the tv, which is less than 2 years old, apart and found the y-sus board, behind the y-sus board is a foam rubber spacer to seperate the circut board from the backside of the screen. I think this pad is designed to prevent heat buildup in the y-sus board. The pad itself is held on by glue and that glue melted causing the y-sus board to short out. I noticed this after finding a tacky substance behind the board. The heat from the plasma screen melted this and also the pad itself. Toshiba claims no resposibility because the tv was out of warranty. Thanks Toshiba.