Hitachi 50V500 LCD Rear Projection TV

This Hitachi TV apparently had a lot of problems with the light engine. The UV rays from the lamp is shined through the lcd panels. In the light engine the LCD panels weren’t sufficiently cooled so a cloud forms on one of the panels. In my case it was the red panel that got destroyed. There is only one fan that is made to cool the LCD panels. It is a blower type fan that is about 40mm or so in width. There is a grey fiber air filter over this fan that protects the intake. This air filter got clogged with dust after a few months of use. When this air filter is clogged so full of dust the fan cant suck in any air. When it cant suck in any air the LCD panels do not get cooled ; this leads to them being destroyed.

50V500 workingThis is a image I found of this TV when It worked. All the colors are setup right, there isn’t any cloud in the center of the screen or anything. This next picture is another one I found showing the problem with the big red cloud in the middle of the screen.

This whole problem is caused by a 0.5 inch smudge burned onto the red LCD panel. I learned that once this happens there isn’t really much you can do about it. The light engine would have to be replaced and that would cost a lot of money. Eventually it would just happen again anyways. When the panels get to hot then this happens. That’s why in this case the goal is to keep them as cool as possible. If it hasn’t happened yet it is preventable, but if it already happened, you have to replace the whole light engine.

Finally I got around to updating this post. I spent a lot of time on trying to fix this tv but in the end I was not successful. I took apart the whole TV to get some useful parts and when I was taking apart the light engine I discovered that the red blob was on a UV filter, not the panel itself. If I had refaced that one filter the whole problem would have been fixed. Now I have plenty of spare parts for this model and I can fix another TV with the same problem. Now I know that you just need to replace one little cheap filter instead of the whole light engine. I have learned a lot from this experience and I will try to fix more TV’s in the future.

2 Replies to “Hitachi 50V500 LCD Rear Projection TV”

  1. thank you very much.. Ive had this tv sitting in my living room for 5 years
    man how i wish you could of taken some pictures on how to fix this red cloud but thanks for the info..

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