Question about Toshiba 52HM95 52" HDTV Projection Television

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Loud hum with ramp up and ramp down sound

My 52HM95 was purchased in 12/05 and still has a great picture. It recently deveoped a loud objectional hum during operation. When I turn the set on there is a 3 second ramp up sound like a table saw turning on and the same sound when I turn it off. I have purchased the Service Manual and learned there are actually 3 fans. The manual has parts lists and exploded views but does not have any detail about replacing the light engine.

How can I tell if its a fan or color wheel problem?

Please email me at with any suggestions. Ray

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  • Ray Winberg Jun 20, 2008

    Thanks Mike for the speedy answer. I am an Electrical Engineer and have mechanical ability but I think replacing the light engine is a little beyond what I am comfortable tackeling.

    The service manual says "When the Light Engine Unit is replaced with a new one, adjustment is required. Adjustment is made from the service mode. The adjusting items consist of of CWDL, CWDH and DMDB"

    Do you know if this adjustment is really required or is it a simple matter to replace the light engine.

    Has anyone heard if Toshiba is standing behind this light engine problem for longer than the 12 month standard warentee?

  • Ray Winberg Jul 24, 2008

    I ordered a new Light Engine for my 52HM95 from on July 15 for $456. Now I learn this item is backordered and they now show 8/16/08 as a ship date.

    Toshiba's web site is showing an extended warentee on the Light Engine for certain models but not mine. One other little aggravating problem is my TV rests on the Toshiba special stand and the TV must be raised about 5 inches in order to get at the 13 screws to remove the back. I plan to use books as shims. Just hope a new light engine is a good investment. Ray Winberg


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It is the color wheel but the bad news is Toshiba will not sell the color wheel for this model, you have to but the entire light engine. part # 23405474 for about $500.00

Posted on Jun 20, 2008

  • Mike Owens
    Mike Owens Jun 20, 2008

    I'm The Lead Tech here at Maier Tv in Spokane WA. when we replace a light engine we almost never have to adjust them, they seem to work fine right out of the box, It may sound complicated but on a scale of 1 to 10 we put this light engine replacment at about a 4. there a a few conection and about six screws that hold this in and all the conectors will ony go in one spot


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