Question about Sharp Aquos LC-32D40U Television

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Sharp aquos model LC-32D40U screen goes black

When turning the tv on it sometimes will display and then go black after a few seconds or it will not display a pictuere at all or it will come on and work like it should... Could this be a power supply problem/ or perhaps the backlight is bad?

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  • rcdorrjr Apr 20, 2009

    Thank You... I will have the inverter board checked out at once...


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The Sharp TV model LC32D40U / 41U "Black Screen problem" is a very well known issue. The inverter is losing ground contact which will prevent the back-light from staying on. The solution is to re-tighten six screws on the inverter board. You also would want to clean the copper contacts on then bottom of the inverter where the screws go through. Access to the inverter board will require some disassembly. Plan on taking at least three hours to repair. See the photo for the location of the screws. Use some "blue" locktight" on these six screws. There is actually a Sharp Technical Service Bulletin that describes these screws. Sharp wants you to replace these screws with a newer version. They cost at least $2.50 each! I think my method will work just as good using the "Locktight"sharp aquos model LC-32D40U screen goes black - _548.jpg_547.jpg

Posted on Jan 24, 2011

  • WillisBryan Feb 19, 2011

    I had the same problem with the back light going out. I too found the screws loose and small burn marks on the copper and metal shell. Cleaned all the lands and put it back together with blue "LockTight". Preliminary on this fix looks good. FYI: I put the 6 screws back in and over 5 minutes went back and resnugged each one several times. I also went around to the other boards and snugged their screws as well. Found several with ground tabs somewhat loose.

    This repair does take some time as there is a lot of dis-assembly to do but the fix was free.

    Good hunting, Willis


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Most likely the backlight inverter board. I would try replacing it, it's cheaper than buying a new TV. is the best place to get parts for a good price.
Here's the page for backlight inverters:
There seems to be two different inverters.
"RDENC2266TPZ" and "250000007800"
The RDENC2266TPZ seems to be of stock.
But, the 250000007800 is in stock from this TV. It's the same part#, so it's interchangeable.

You'll have to find out which one is the correct board. Your board in the TV should have the part# on it.

Posted on Apr 20, 2009

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Thanks for the solution dsacco, although your solution may just be a temporary fix. Here is my experience: I have a Sharp LC 32D40U, and had exactly the same problem last year. I had it fixed locally, paid $190 (parts and labor) and told me they replaced a "board". Exactly 1 year after the repair, the same exact problem started happening again. Of course the repair warranty is only 90 days so it would probably cost me another $200 to get it fixed again. I called the shop that fixed it previously and they would only give me credit for the labor if it is in fact the same problem I had before, I still have to pay for the part. If it is a different problem, they will have to charge me for labor again. I think I may be coming out ahead if I just give up on this Sharp, since I can buy a brand new 32" Vizio for less that $400.

Posted on Jun 05, 2009

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