I have a 55in hitachi i purchased a little over a year ago, and sure enough, right when the year warranty ran out, i started noticing that images were beginning to burn into the screen. after a while, i noticed that the spot that images were burning on, now have a blue spot growing larger as i use my television. i guess my question is, is there a quick fix, or do i need to just buy a new tv. i don't wanna spend too much money fixing it when i can just go and buy a new tv.
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i have a hitachi 55hdt79 that i purchased brand new some years ago and after only 1 year of use my girlfriend with her infinite wisdom threw something at me and as I dodged it the item hit and cracked the screen on the TV! I took it off the wall and boxed it up and has been sitting in my basement ever since. It still powers up and you can hear sound from it but for obvious reasons there is now image. If someone wants to make me an offer for it so they can use the parts to fix their own tv please let me know. email firstname.lastname@example.org it is located in Brooklyn NY 11223. you pay for shipping or I prefer you come pick it up. no reasonable offer refused.
Contrary to popular belief, any display product can have "Image Retention" and even "Burn-In". This is true for Plasma, LCD, LCOS, DLP, and CRT. I do not see a model number provided, but I would bet that you have an LCD rear projection TV rather than a DLP projection TV. If this is the case, the Blueish and Greenish blotches you are seeing on the screen are the result of UV light damage. UV light will move heavily damage the Blue panel, due it's short wave length. So, bad Blue or Green (absence or Blue) is typically the the first visual indicator of a problem. Replacing the Light Engine will resolve the problem.
Sounds like Calibration is needed on the projection internals. Your TV uses a rear-projection system and the problem is either in the imaging LCD Unit or the light filter. I see in a previous thread you have changed the bulb. You can invest in a voltage regulator to keep the hardware in factory condition.
Also you can burn a DVD of a stuck pixel remedy video and run it on the screen with full brightness and full contrast. This is used for plasma burns and stuck pixels on conventional Flat panel TVs but can repair color issues with projection systems. This therapy is focused on the imaging unit between the projector and the main drop of your tv.
please feel free to post a more in-depth description or any changes
I have been told by a local repair person that Hitachi might replace the light engine at no cost because it is such a big issue... has anyone hear about this... I am going to contact them directly also.
Do you normally leave this set on a specific channel...such as CNBC or BLOOMBERG tv...etc that maintains a regular scrolling image???
If so...on sets that are a few/several years old...the projection tv screens can develop what's called a "burn" or "burned image" on the screen...similar to wearing a path in your carpet from heavy traffic areas. Newer models do not have this issues...but many older ones do.
I had the same problem on my Hitachi rear projection TV 53FDX20B made in Mexico. The blue convergence problem. Blue focus had shifted and appeared like a blue ghost image. I followed the step by step intructions from the fixya site. First Replaced the two STK 392-110 ICs and turned on the tv. No change. Then I went looking for the bad resistor. There was one resistor RK50 (2.7 ohm, 1Watt capacity) which is attached not right close to the printed circuit board surface but was well raised up from the board. The bands on the resistor were a little discolored. I replaced that one and turned on the tv. The convergence problem was solved. Thanks for the step by step instrucitons on your site.
Email me privately and I'll send you the asc data sheet directly from Hitachi... Make sure to give me enough information about this to jog my elderly memory - I get between 3-5 thousand emails a day...