Question about Quasar SP-2722 27" TV

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Broken Electron Gun?

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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  • Wombat5000 Jun 01, 2008

    I think I have a similar problem in my 27 inch Sony. There seems to be no red in any of the picture on all channels. When I put on NBC and the peacock logo appears, the feather that is red appears to be black. Everything seems to be shades of blue, green and gray.



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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.

Posted on Aug 06, 2006


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My monitor turns yellowish i can still work what is the problem. the monitor is a Acer V233H

The red "gun" of your CRT monitor is going bad. You will need to get a new monitor, and you should seriously consider an LCD flat screen. It will save you allot in electricity.

A CRT monitor is a very cool piece of technology inside... even though they are going obsolete with the advent of modern LCD displays.

In every CRT (Cathode Ray Tube) monitor, there is a trio of "Electron Guns"- they fire electrons at the front of the screen, hitting it with billions upon billions of electrons... the "bullets". Each gun is aimed at a set of colored targets, called "pixels"... one gun hits red ones, one for green, and one for blue. Combinations of these colors make up everything we can see.

When the red "gun" cannot fire enough electron "bullets" at the screen, the blue and green together make the picture appear yellowish.

If you want to learn more, look up "cathode ray tube" on wikipedia for starters!

A word of warning- the technology is very cool (I used to teach how CRT screens worked as part of my job teaching Missile fire control radar for the Navy), BUT:


Remember- the electron "guns" inside are shooting billions and billions of electrons at the front of the screen. They are being collected from the screen by a high voltage "supply". Most CRT's operate with anywhere from 15 to 45 THOUSAND VOLTS!

Feb 10, 2011 | Computers & Internet

1 Answer

Can't red and green colors

This usually means the red or green or both primary color module is bad. Monitors come with 3 primary color module controllers and they use them in various combinations to make the other colors. The primary colors are blue, green, and red.

Sep 17, 2010 | NEC AccuSync 900 19" CRT Monitor

2 Answers

No Red color at all. The convergence feature does not work either. Lots of green and blue RCA Model D52W59

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 !

Nov 28, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

2 Answers

I have a toshiba 65hm167 no red color on the screen

Your TV is a DLP one lamp does it all, not like the old projection TVs with the Red, Green & Blue CRTs. Your TV may have a bad light engine or lose cable connections.

Good luck
N Sabre

Nov 08, 2009 | Toshiba 65HM167 65" Projection Television

2 Answers

Red, green and blue colours diveded on my TV

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

Aug 13, 2009 | RCA 20F512T 20" TV

1 Answer

TV picture is red.

Normal color picture is composed with 3 colors R-G-B (Red-Green-Blue). Picture turns Red means: Missing Green and Blue colors (many reasons: bad contacts, projector tubes dead, and other...). Try to give some "tabs" to diagnose ... I don't know what is the type of your Projection TV, how long you owned it, to have more idea.

May 15, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Guns on their last leg- color fading

If you are asking about Guns in rear projection tv then answer is No.
Rear projection TV has 3 Guns (CRTs), red-green and blue and each gun has its unique color phosphorus coating to produce its mono color (red /green /blue) and these are not interchangeable.
Need further info, let me know.

Oct 23, 2008 | Televison & Video

2 Answers

One of the primary color is absent

Hey Kuld.. Just asking... since both, your TV and your monitor have the same color issue...??.... have you been to the optometrist lately... (My Dad had this color issue with his eyes!).. he was red color blind..
Good luck,

Jun 20, 2017 | LG Studioworks 700B (White) 17 in.CRT...

1 Answer

Bad color .

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.

Oct 24, 2006 | Zenith A25A23W 25" TV

2 Answers

My tv has a bright grrn tint

Is there a color button on your T.V? Maybe someone bumped it. You know, like on the old Macs. I know your tv is new, but there might be a button. check.

Jun 07, 2006 | RCA 20F511T TV

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