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Light Engine I am being told that the "light engine" needs either repair or replacement. My machine is projecting the typical blue epson screen, but it is intelaced with red lines. Is there anything that can be done to repair this? If so, can I repair it or must a professional take care of it?

Posted by Dan Brown on

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Try this befor changing :- go to menu button ---go to image -----go to pictutre quality----go to tracking try to adjust by left and right arrows.

Posted on Mar 14, 2008


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Model# KDF-42WE655 Sony TV- front screen has hundreds of tiny blue lights with solid blue running up the left side and now in center of screen it appears yellow light when turned on size almost the full...

bad light engine. light engine replacement is very expensive. I suggest to look for an expert Electronic Technician who can repair light engine. LCD replacement is quiet cheaper...

Blue dot all over the screen

Blue dot on screen is caused by a faulty light engine..This is common trouble but very expensive to repair if you replace the light engine. I suggest to look for electronic technician Who can repair or replace the Blue Lcd on light engine....

Portions of my screen are blue - I am still able to view the entire screen and programs, but there remains a blue section which has grown in size over the last few months. what might the trouble be?

This is a set made by LG who is also Zenith.

This model has a well known history of the optical light engine being burnt which causes the blue to be present in certain parts of the picture.

The lamp shines a very bright light into the L shaped optical light engine---there are lens and partitions inside--blue, green and red and the blue is closest to the lamp and the heat.

There are also at least 2 or more versions of the optical light engine used in this model.

If you do not have an extended warranty----it will cost too much to repair---last one I saw over a year ago the engine sold for over 600 exchange, not counting major labor to replace it.

I do not enjoy giving bad news but I have seen over two dozen sets with the same model number and same problem.

If this told you something you did not know rate this solution as very helpful as I do this here for free--I am 100% sure it is the Optical light engine....

Sorry to give you bad news.



The screen has light blue discoloration than the rest of the screen.

it looks like water mark in the picture
its a warped blue plate in the light engine
it will require a light engine replacement
you might try contacting sony and have your mode and serial and reciept with puechase date and see if there still providing assisatace with this repair

There are blue dots all over the screen and a blue tint on the left side of the screen

It is problem of light engine (optics block assembly) in TV and complete light engine will be replaced. It is costly part, check with local TV repair shop for cheap fix if they can.


Hitachi 50V710 Yellow screen

You are correct on the diagnosis of the problem. I would contact a reapir shop and ask them how much labor cost is if you bring them the set and the new light engine.

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throw the set away!the part required to repair the set is the optical engine.Zenith made alot of these sets with defective engine assemblies in wich the lcd filters burn,which cannot be replaced.The labor is also silly.Theunitrequires a complete teardown for replacment.You could buy a very nice new set for the repair bill
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