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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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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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Red light blinks four times

Four blinks = No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505 (this varies from model to model). If you have no expertise with sets like this, or this does not solve your problem, get a quote from an authorized SONY service centre - before going any further or getting the set fixed. It doesn't matter if the set is a flat panel widescreen or standard CRT model; the symptoms are similar for each and the repair costs for such will be pretty much the same.

Dec 29, 2013 | Sony KV-27S42 27" TV

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I have a GVA tv which when I turned it on this morning has now got a sort of circular rainbow on it, the people in centre of screen appear green, then it's like a blue circle filling most of screen, then...

your positor has failed you can change it your self if you have a soldering iron you can find parts on charles hyde web site and you will need model mumber of tv they are not expensive £5 not hard to replace but if you take tv to shop you are looking at a bill of about £50 - £60

Nov 27, 2009 | Televison & Video

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Rainbow of colors on screen

I just had a rainbow of colors on my tv screen...i thought it was a problem with my TV...however the screen went the "sign off" screen (verticle lines-red/blue/green) Then all of a sudden the picture came back and all was back to normal again.

So I say it's nto your TV it is a station problem!

Aug 04, 2009 | Panasonic 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.

Jul 04, 2009 | Panasonic PT-56TWD63 56 in. Rear...

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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.
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 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.

TV set after fluid change


2c07611.pngSolution #2

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

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

1 Answer

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

1 Answer

Rainbow look on my picture

hit pictue tube w open palm if colors move crt shot.  if not magnatized need degaussing.  or defl youk loose.

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The picture tube has become magnetized, possibly by someone getting a magnet to close to it. You can de-magnetize it using a strong magnet (cow magnet or similar). Place the magnet as close the the screen as possible without touching it to the screen. Starting at the middle of the screen and slowly (not too slow, about one full circle per second should do) move the magnet in a circular motion. With each full circle move the magent twards the outside (making a larger circle) as well as moving it farther away from the screen. Using a magnet will not harm the screen, so play with it and you'll soon get the feel and will see what you need to do.
Tv's have a circuit built in to 'Degauss' (demagnetize) the screen each time you turn it on, but this will only work if the set is 'Cold'. If the set is left off for 2 hours (to cool doen) and does not demagnetize when you turn it on the circuit is faulty.

Jul 21, 2008 | RCA TruFlat 27F520T 27" TV

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Sudden color/picture distortion

you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.

Feb 25, 2008 | Samsung TX-R3080WH 30" TV

1 Answer

Circlular discolouration on screen

Im sorry My friend I dont have a clue what your saying .. I need a picture or more detail as I dont have a clue where to start get back to us.

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