Question about Toshiba 42HP66 42 in. LCD Television

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Toshiba 42Hp66 No picture only sound

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?

Thanks in advance!!

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  • rluna Apr 19, 2008

    I wanted to add a something that may be important.

    Here is the story of what happened. This happened hours after plugging in an S-video cable from the Comcast cable box. It was from an effort to upgrade from Coax (analog). It worked fine until the next morning when it just died.

  • rluna Apr 22, 2008

    I figure that this would be a tough question for someone to answer :)

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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.

Posted on Dec 31, 2008

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Toshiba 42HP66-Have sound. Picture starting getting light. Now screen is black when first turned on but picture eventually lightly "bleeds" thru.


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.

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1 Answer

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One of your y driver almost go bad. For your future problem please visit my site athttp://billy-tech.blogspot.com/

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Hello, You most likely have a bad Y sustain board! Part #'s are:

6871QYH053A, 6871QYH053B, 6870QYH005B, 6871QYH953A, 6870QYH105B.

Here is a link to the part you need!

http://www.discount-merchant.com/Y-SUSTAIN-PN-6871QYH053A-6871QYH053B-6870QYH005B-p/vizio-sku9506.htm

I hope this help you! Please feel free to give me a call or message me if you have any questions! Ask for Dave!

Thank you! :-)

Dave
1-503-432-9904
pleasefixitdave@yahoo.com

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1 Answer

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Hello, You may have a bad power supply! Its hard to say! I need more info! please feel free to call or message me if you would like more help with your TV!

Thank you!

Dave
1-503-432-9904
pleasefixitdave@yahoo.com

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1 Answer

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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.

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1 Answer

42hp66


Hello, You most likely have a bad Y sustain board! Part #'s are:

6871QYH053A, 6871QYH053B, 6870QYH005B, 6871QYH953A, 6870QYH105B.

Here is a link to the part you need!

http://www.discount-merchant.com/Y-SUSTAIN-PN-6871QYH053A-6871QYH053B-6870QYH005B-p/vizio-sku9506.htm

I hope this help you! Please feel free to give me a call or message me if you have any questions! Ask for Dave!

Thank you! :-)

Dave
1-503-432-9904
pleasefixitdave@yahoo.com

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Artgirlny

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