Question about Hitachi 51GWX20B 51" Rear Projection Television

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LCD rear projection tv has green and yellow discoloration at the top and bottom of the screens

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This sound like a Bad Optical Block. If this is a Hitachi, and it is less than 3yrs old, I would try to see if Hitachi will help with the repairs. You would still need to get a local authorized repais facility out to comfirm it is the Opical Block. They should be able to help with that as well.
Hope this helps,
Skyassoc

Posted on Jun 29, 2009

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I replaced the lamp. now I have discoloration, Red on top and blue on the bottom


Your TV is an LCD rear projection type which requires a Mercury Vapor lamp. Mercury Vapor lamps emit UV light which is damaging to many materials. The discoloration you are seeing on the screen is the UV damage that has resulted over time to the LCD panels within the “Optical Block” (aka projector) of the TV. This discoloration has been creeping up on you for sometime, it just wasn’t as noticeable until you changed the lamp. Once you installed the new lamp, the UV light is bad at full force and the damage progresses at a quicker pace, due to the already weakened state of the LCD panels. Additionally, the picture is now brighter, exposing the damage for you to clearly see. The only fix for this problem is to replaced the Optical Block… an expensive repair. Although this is not good news, I hope this helps you understand the cause & solution and was of some assistance.

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The coolant in between the CRT face and the focus lens has probably become discolored and would need to be drained, cleaned and refilled. The green CRT is the center one and it would have to be romoved in order to refill it.

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1 Answer

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It sounds like you have a bad Blue Polarizer in the light path. I'm sorry but that is something you will have to contact a service center for. It's not something you'll be able to do yourself, I'm sorry, but that's the best advice I can give you.

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1 Answer

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bonsoir!ce que vous avez ici c'est un probleme de light engine ;c'est surement un le filtre bleu qui est brule et cette tache va remplir tout l'ecran apres,il faut contacter lg et manifester parceque le light engine coute tres cher 900 us

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1 Answer

Sony 60" LCD projection TV has yellow screen discoloration


I would suggest to try to get this TV fix while still under warranty. Normally the manufacturers give one year.
In regards to the discoloration, there is not much you do but to let the Sony authorized repair center knows about it so they can fix it. Ask them if their work is guarantee as well for how long.
Good Luck.

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1 Answer

Discoloration and shadow in the top left corner


one of the CRTs is going bad...my guess is the green...hard to dignose without a pic...email me a pic of the problem to : harry0000010@yahoo.com and I'll be happy to give you some advice

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