Question about Zenith B25A74R 25" TV

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Color Problem I have a Zenith Z27H32D. Made in 1997. From my understanding, most tv's run on only three colors. Green, red, and blue. My problem is that I have green and red, but it appears that I no longer have blue. I still get a good picture, but everything is red and yellow. Is there a part I can get for this, or would I be better off just getting a new tv? Thanks

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  • redneckinfor Nov 21, 2008

    No solutions?

  • redneckinfor Dec 02, 2008

    That's what I was afraid of. Thanks.

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Prob bad crt. blue gun weak. new tv is answer.

Posted on Dec 02, 2008

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HI

you have defective RGB Circuit The Red, Green, Blue, You have shorted Green Circuit in Crt circuit this needs to diagnose to locate the shorted parts...

Thanks!

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This is very typical of a Zenith set.Your picture tube will have to be replaced.One of your 3 primary colors (red,green,&blue) have turned off leaving you with the color of the dominant color.I would heave it.

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1 Answer

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Hi, If you are comfortable working with a soldering iron, a continuity (VOM) multi tester and a fair knowledge of electronic components, then perhaps you can repair the missing color red. You have to open the unit, expose the small printed circuit board that is attached to the small end of the picture tube. There will be many components present but you will need to focus yourself on three (3) transistors that are bigger than the others sometimes with an aluminum heatsink. It is also possible that instead of 3 transistors you will have one power IC. In any case these control and provide the drive for the 3 colors of your picture tube: red, green and blue. One of them is either dead or suffers from cold solder to any or all of its pins/legs. You have to visually inspect the solder joints of these big transistors/IC and determine if any is dull in color, loose of simply not connected. You may even try the shotgun approach and solder each of the pins/terminals/legs just as long as you don't cross solder creating a short between pins/legs. If this works, you're set, if not: You have to check with the use of the VOM and determine which of the 3 transistor is defective. If you are familiar checking continuity of base to collector to emitter and reverse, again you're set, if not perhaps you check all three and compare which have the same reading from the same position and which is different. Pls keep in mind the transistors have forward and reverse bias readings. If able to determine defective component, desolder, replace and solder. If it were an IC, replace the entire pack. If the above would make you uncomfortable, pls ask for the services of a qualified TV repair man and explain your problem. Hope this works out for you and give you some ideas. Pls post again how things turn up, good luck and kind regards.

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