Question about Zenith A25A23W 25" TV

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Bad color .

The problem is the set works well in all modes and menu functions. problem is the color is pink and purple. crt board resistors check out fine .#"s C5147 that controls color is questionable. any solutions would be appreciated board is a 9-1996

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  • Art Questell Oct 25, 2006

    This is a 1999 Zenith model A25A23W, BOARD - GA-3 Warrior Line 9-1996

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  • 398 Answers

Turn the set on without an antenna, so there is only snow on the screen. Measure the 3 cathode voltages at the CRT, red green and blue. If the 3 voltages are about the same, around 175 volts, then the CRT is bad (purple picture means bad green gun). If the red and blue are around 175 and the green is over 200 volts, then there is a chassis problem, usually the video output transistor itself has gone bad or come loose.

Posted on Jun 26, 2007

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Posted on Jan 02, 2017

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You have a bad ground on a color output transistor or a bad ground on a color output resistor. These are located on a board that is attached to the CRT. Also check the diodes on this same board, these may be bad as well. In worst cases the color output transistor and a diode will be bad. Thanks for asking!

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At its worse you have a color gun in the picture that is bad. On a positive note you may have a bad ground on the crt board. Or a bad color output transistor,or bad transistor ground on the crt board or even a bad resistor, or resistor ground. Have someone inspect the CRT board. Hope this will clue you in to finding a solution!

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My tv only shows black and white no color, how do i fix?


You should check circuit boards for bad solder joints. It's possible to have a defective part on the board, open resistors, coil with broken wire or others. You could have a defective chroma chip or joint/part in the area. You should check the tv menu to make sure the color settings haven't been turned down first.

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Green and Purple Color with Double Image


The color has gone crazy on you because your convergence IC's have gone bad.
These operate at a very high temp, and usually only last 4-5 years. 
If you remove the back of the set, you will want to look for the BIGGEST heatsink in there, on that heatsink, you will see 2 lage IC's , probably STK392-110, or STK392-150's you can go on ebay to order the new ones, but MAKE SURE they are Genuine SANYO IC's and not counterfiet cheapies. the cheap ones may only last 2 months..
You will also need some "Heat transfer paste" - you can pick this up at radio shack.
Once you remove the old IC's, test all the large resistors near them.. pull one side of the resistor out of the board so you can check it out of circuit. they will usually have the value in Ohms, printed directly on the resistor, but you may have to use the resistor color code to find out what value they are....However, usually if there is any damage, the resistor will look like it has been HOT or fried. replace the IC's and any bad resistors, and you should be good to go.
If after replacing the IC's and any defective resistors, the convergence is still bad, make sure to use a multimeter to check ALL fuses on the boards, --- sometimes when the IC's go, they will take out a fuse to the convergence power supply. If you find any bad fuses, replace them accordingly!
Hope that helps!

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Pinkish Red Screen??


the RGB controls that you found were those the focus or were they the screens? There should be small switches like that (variable resistors) on the CRT circuit boards themselves. The crt circuits are attached to the crts end . You can gain access to them by removing the speaker grille and access panel in front. I am not sure of the resistors number for that model, however these are always brown resistors and and you will see that one leg is attached to the runner right next to that control switch. I will try to locate the service info for that cahssis V18 and repost if I can locate the info.

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1 Answer

Pinkish red screen


Your set doesnt have a color wheel you have 3 CRTs instead. Try turning down the red drive on the red crt circuit board that should help if not check the resistor that is connected to the red drive switch Vasriable resistor(switch) that is probably open if not the crt is probably at fault. If you need more info let me know.

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the remote need to clean pcb board ..... the chroma section pcb need to resolder loose parts such as resistor, capacitor or transistor that you may see on it.....

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check for open resistor R302 on the CRT board. 150 ohm 1/8 watt SMT resistor, located at the base of Q305

Feb 11, 2008 | Televison & Video

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Triple picture and purple bubble on big screen


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
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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.

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