Question about Projection Televisions

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I hane a Sanyo Model HT32744 CRT HDTV I purchased in April of 05 and for a year now it will drop out the red and green spectrum and the only color is blue and yellow. If I wack the cover it goes back to normal colors. The first time I did this it worked fine for over 3 months but now it is more frequint! I saw some websites that had comments on this problem like cracks in solder connections on the color board that plugs into the CRT and component problem on a PC board. Checked the connections on color board and they looked fine. It sounds like this a common problem with this TV. I was wondering if the PC board creating this color problem is available and where?

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  • overyjb Jun 25, 2008

    Are there any more comments before I take it appart again?

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  • Master
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I found the part number for the board, but unfortunately I couldn't find any for sale on the web. You might try contacting Sanyo directly. Here's the part number, hope it helps.

Sanyo Model HT32744 Main Micro board P/n E22459

Posted on Jun 25, 2008

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What I do with colour cast problems :-

1) check the voltage (with no aerial signal) on the collector of all three video output transistors (on the crt base) they should be +-5v of each other if one is different, then swap over this transistor with one of the other two and if color changes, its the transistor, If not then I use a 2k-4k wirewound and touch it from each collector to chassis in turn, and watch the screen (I use a mirror) each color should be equally bright with flyback lines, if not its probably the tube (CRT) faulty.

2) If all of tests are ok, then I find the three wires coming up from the the main pcb to the crt base panel and swap over the green/red and see if the color cast changes
If yes then its the chip on the main board, If no its on the crt base board, so check values of all the resistors there.

Posted on Jun 25, 2008

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  • Projection T... Master
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Yes, check for any bad solder on the convergence module..

Posted on Jun 25, 2008

  • 1 more comment 
  • micromaster
    micromaster Jun 25, 2008

    and do a test on the IC, and capacitor, resistor on that area too..

  • micromaster
    micromaster Jun 25, 2008

    let me know..

    kindly rate my solution if this solve the problem..


  • micromaster
    micromaster Jun 25, 2008

    if you don't have any idea or professional background servicing that kind of unit, it was not advisable for you to work on that..

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1 Answer

50" hitachi 10 years old has blue and green colors


Your TV most likely has one of two 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.
701cb04.jpg
77ea520.jpg
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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.

578ba6c.jpg
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

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1 Answer

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It seems the HT Transformer (High Voltage) transformer is unable to supply the desired voltage to the picture tube. It was probably ebbing giving rise to the the red tinge earlier when starting up but easing up as the tube got heated up, however now the voltage has really dropped. Since the tube works by displaying a combination of RGB(red, green & blue) to make up the complete spectrum of displayed colors either the HT transformer &/OR the tube needs to be changed.

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My RCA HD52W59 HDTV Television has double vision and red, green and blue colors separated like a spectrum in stead of all the colors blending together to make one uniform picture. What can I do?


Ur tv have a problems known as a convergence problems,it dead.The tv convergence board require changes 2 STK convergence ICS and some or all it resistors to solved convergence problems.The shop,will cost u $300-350 for parts and labors.

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1 Answer

Projection is messing up. Too much red and blue color.


Hello,
A CRT projector requires Convergence and Color balance adjustments from time to time. These settings can drift. What you are seeing is a lack of Green color intensity. Do you see some pink in the 'whites'?
The Green CRT surface also burns off faster than the Red and Blue leaving behind the same appearance. As long as your Green CRT is not too burned by gaming or watching Golf and football, a local tv tech will be able to dial it in for you.

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Red color gun has failed, which will make the picture over saturated with the other two colors(blue,green) the bad news is the three color guns need to be replace in a set(all at the same time) because if you only replace the red it will over saturate the older blue, green guns then your picture will be mostly red.Unfortunently in most cases it's not worth the investment, better off to purchase a new tv. Good luck !

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it should have a year warranty get it in for warranty repair before the warranty runs out or someone tells you the wrong thing to go and the tv ends up as a big paperweight...

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for testing, place the green crt board on the red crt and see if the red crt lights up and the green does not. If the green does not light up then check for 200+ volts on the collector or the output transistor. if you have that kind of voltage thee then check for an open resistor. If not then make sure the transistor is not shorted

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2 Answers

Screen is getting darker



The most likely cause is the blue and green tubes need to have the cooling fluid changed. After many years the blue and green get clouded with algae. The red tube won't have the problem due to the red spectrum kills the algae before it has time to grow. 

The way to replace the fluid for is to completely remove each CRT from the set, remove the drain plug, drain the fluid out the tube, disassemble the lens, give it a good cleaning; then reassemble; add fluid; and reinstall in set. If you check with the site www.TvRepairKits.com they are working on a kit that includes the fluid and photo instruction guide. 

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1 Answer

TV problem


Sound like either the Red or Blue driver transistor on the CRT board is intermittant.

Hope that helps...

Geno

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1 Answer

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Bad crt

Sony Picture tube recall
http://esupport.sony.com/perl/news-item.pl?news_id=24
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