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Problems with dimming picture on Hatchi Rear Projection Televisions

I have problems with dimming picture on an Hitachi Rear Projection Televisions if I don't have the Brightness control turned all the way up.

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  • michaelwa42 Feb 08, 2008

    It Is about 5 years old HDTV but not DLP. It has red, blue and green CRT lamps.

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What is the model of your Hitachi and how old is it? If is a DLP you lamp is going to need replaced.

Posted on Feb 07, 2008

  • Les Price Feb 09, 2008

    As a crt set ages the crts get weak and the screens may need to reset. Behind the front speaker grill (which in most cases will just pop off) you will find a panel that can be removed. You should find a small block assy with 3 screen controls and 3 focus controls. Make sure not to adjust the focus controls. The brightness level can be raised by adjusting the screen controls up. To do this you should turn off the color on the picture because you want to adjust all three colors evenly so that your brightness level increases but you need to maintain the gray scale or keep the picture black and white. Not to green, blue, or red. If this is not effective then you may have a failure in the video circuit and a tech will be needed.

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