Question about Zenith SY2722RK TV
I have worked on tv's alot in the past. If I got one in that had weak color quality, I would simply install a CRT brightener. Can you recommend an easy to install color brightener for this particular model? I am currently looking at the CB-390 Color Britener online but am hesitant to purchase a unit that doesnt state it fits my specific model. Thank you, Troy
SOURCE: Zenith A25A11D No Red Color
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.
Posted on Aug 12, 2007
the variations of the supply causes that. a verticle stability be checked, specially semiconductors and capacitor changing valuas
IT=CV=Q AND frequincy = f=i/t
so if I AND T CHANGES CAUSING MOVEMENT OF PICTURE
SO I is for time and T for tempareture
Posted on Mar 28, 2009
i have a 1999 zenith big screen,model #12902AN iF I UNPLUG IT WILL *** ON 3 SECOINDS THEN ALL THE GREEN LIGHTS ON BOARD WIL GO BACK OFF.
Posted on Sep 30, 2010
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Classic symptoms! Most of the last TV's made by the old, original Zenith company (Rauland division) had bad picture tubes even when new. This probably had something to do with their going out of business and being taken over by a much better Korean company (LG Electronics AKA Goldstar). Another lovely thing they did before biting the big one was to only sell a complete chassis as a repair part. If your TV is older and has a small white paper tag inside somewhere on the picture tube (usually near the larger brand and type number label) with the code "EIA 1101" on it, discard it. I have NEVER seen one of these work correctly! If the CRT is made by someone else, there may be slight hope. Even if the TV is not very old, if it was really made by Zenith, and not LG, the possibility of repair is slim simply because of the change of ownership. I was sad to see Zenith die such a horrible death. They used to be fairly good, but somehow never made the transition to color TV. After 1954 they were essentially moribund.
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