I just bought this TV used. The color is bad though: I know there are 3 primary colors (red, green, blue) that make up each pixel, but I suspect that the blue electron gun is broken because all the pictures have a green or yellow tint.
Is there an easy fix for this problem? If it's something that requires a trip to the repair shop, what should I expect to pay?
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Re: Broken Electron Gun?
Pls do not jump to hasty conclusions! 'Electron guns'do not break!
It could be a simple problem like a faulty CRT base! Or perhaps the Blue Output Transistor is faulty!
First ask a good technician to have a look.
If he confirms that the Blue Cathode is faulty, then I advise that you get a new set.
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since every display color monitors are only work with 3 primary color which are red, blue and yellow. You could also search it that by mixing these colors, you could get any color your want. Thats how color monitors work. Now in case of green color, it creates by mixing blue and yellow. When you are turning the screen adjustment screw, the red color plug will become lose, makes it appear green. I hope your got the reason.
there are three primary colors from your TV's chroma circuit, red green and blue.. you'll notice it when you open your back cover of your television set, the wire colored red, green and blue.. you better leave it to the expert technician to prevent severe damage
The arching of color can be adjusted on the color gun by slighty turning the screw on the gun Blue, Green, Red. This fixes the arching and or fade-blinking in and out of color. The gun on my 65" sony is inthe front of the set. Removing the front panel grants me access to this. You may have to access it from the back on your model. Looks like a small box with 3 screws ont he front. Hope that helps...
the problem is at the crt base .there r three red,blue n green o/put.verify if there is dry in the soldering n check the red cathode voltage it must b around 150 .if not then check the resistor that feeds the red o/put.it could b 12 to 15k.
all crt have 3 driver color red blue n green,whenever one driver not working the color changes.that wat happened to ur tv
now i do not know wat model u have.the drivers may b transistors or now its ic that r being used like tda 6103q.best of luck
ok well "tube" tellys as they are called use an electro magnet to keep the picture stable and colours correct its called gaussing now if you have a speaker or something magnetic nearby it will stuff up the colors but only normally producing colors like purple,green, or white
if you have colors across the screen (that aren't caused by magnetic force) then you need to take it to a repairer or decide wether or not to buy a new one this issue can turn out to be quite hard to fix and can be expensive the different colored electron guns may be burning or burnt out causing pale color or it could be as simple as a power transistor in the H.V supply has shorted out..and causing power issues to the tube.
hope this helps,ben
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.
this sympton is characterized by the presence of red, cyan, green, magenta, blue or yellow colour in a supposedly plain white raster. proper colour reproduction cannot be expected if the raster is coloured.
this symptom is caused by a poor white balance adjustment of by a trouble in the CRT, colour amplifier, color demodulation or colour output circuits.
if the raster has a tint of red or cyan, check the R-Y output circuits and the first grid, second grid and cathode circuits of the red electron gun.
but if you dont know anything about this, just bring it to a qualified service technician. good luck!
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.