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Hitachi 28" flat widescreen (crt) screen has circular "rainbows" (blue red green) from centre to the outside on starting up the tv. These slowly work their way to the outside of the screen. The tv also crackles on start up HELP

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Hi.

Sounds like the degause thermistor is either faulty or the legs that are soldered to tv circuit board from the thermistor are dry jointed (require resoldering to pcb)

Easy job to repair your self or get repair shop to do it.
If your in the UK will cost £30.00 to £40.00 for repair shop to repair.

Posted on Jun 29, 2008

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We cleaned the inside of our tv and now we have a green screen


Please tell me how you actually cleaned it? Seems you may have hit something that turned the Green CRT gain up higher than the blue and red CRT?

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For CRT projection TV's, this indicates that the Green picture tube is burned (warn out). The less green that strikes the screen, the more redish the image will look. You will need to find an old school TV repair shop that knows how to replace picture tubes.
In the case of a DLP style TV, the color wheel needs replacing.

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Where is the picture tube on my hitachi projection tv


If you have a Hitachi projection set there are three crt's red ,green and blue respectively . They are mounted three across behind the lenticular and fresnel screens.

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I have a hitachi rptv model #43FWX20B and the picture has a red tint to it. Opened back up and red green and blue bulbs light up. red bulb stays bright while blue and green go dim to bright as tv plays....


Howdy;
Since you don't have any white lines with the red screen/picture I would say that the red bulb (CRT) is conducting too much. There is an adjustment control for that. The 'sceen' control is behind the speaker cover and service cover. Turn red screen control slightly to the left until you get a good black and white picture.

Good Luck, Big Irish.

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I have more and more tiny bright blue dots


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The screen is going green, what should I di


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Jul 25, 2009 | Hitachi Televison & Video

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The screen has a rainbow of red blue and green on bottom


The specs say this is a CRT type projection system, so it could be related to the display or to the TV. Since this has an SD card, it might be good to plug in the memory card with some pictures on it, and see if the problem persists with a source other than the tuner. That might at least narrow down whether you have a display failure/adjustment issue or something else.

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Hitachi Television


Your TV most likely has one or more possible problems.

Problem #1: Convergence Chip Failure ( common problem )

Here are some of the most common symptoms and example photos of a convergence problem
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
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Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.



You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.

2c07611.pngSolution #1

You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick note and they will put one together for you. Their kits include a photo instruction guide, original OEM Sanyo STK chips, convergence resistors, pico fuses, etc.


Problem #2 CRT Fluid is Cloudy

Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.

Picture of a set that needs the fluid changed.

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TV set after fluid change

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2c07611.pngSolution #2


What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.

Feb 18, 2009 | Hitachi 53UDX10B 53" Rear Projection...

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Rainbow lines in my projection tv


You have convergence problems. The convergence IC's that line up the red, green and blue crt's are bad. They will need to be replaced. Suggest a qualified tech do the work due to the complexity and alignments afterward

Dec 12, 2008 | Televison & Video

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