Question about Hitachi 50DX20B 50" Rear Projection Television

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Colors seperating when unit first powered on

It seems like the blue colors are seperating from the rest when the TV is turned on. It goes away in 1-4 minutes. It just starte4 days ago and does not happen each time, but is getting more frequent. Thsi TV weighs 225 pounds and is downstairs, so hopefully I can repair it here. I am well versed at schematics and soldering as I repaired military aircraft for many years and now am a computer tech.

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I would suggest to check the following link for a schematic diagram that may be close to your model. I do not think they have changed their design much only the model numbers just to add more features or charge more.
http://www.eserviceinfo.com/equipment_mfg/Hitachi_2.html

You will need to change the convergency STKs to restore the distorted colors. Check the low value resistors, fuse esistors that are connected to the ICs leads.
Those parts are mounted on a heatsink, they have normally 18 to 20 leads depending on their numbers.
Hope this helps.
Good Luck.

Posted on Feb 06, 2008

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