We read these posts, gathered information, took the back panel apart on my 42HP66 Toshiba Plasma and identified the YSUS and the ZSUS boards. It appears that it *could* be the ZSUS board since it is making a high pitched noise (you have to put your ear up to it to hear it). Sounds like it could be fried. Any suggestions? Is there a way to actually test these boards? Any special tools needed?
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Re: Toshiba 42Hp66 No picture only sound
To test the zsus board check for a low resistance on the fuse to ground. sadly if the zsus is bad, the ysus and one or both of the driver boards is probably also bad. best to change all at once as a defective one can tacke out the others.
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The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
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.
Your Cable box might need to be reprogrammed. Call the cable company and they will drive you thru the steps to program it, this way you will get the channels. This process might take you 30-45 minutes.
I have a 50 plasma Toshiba and since this morning it turns on and off every 20 seconds by itself. The control is not working either. When it's on it nakes a static sounds and then just shuts off. If anyone can lep me please do so.