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The colours on my Rowa 27inch CRT have devolved into a target with a green centre surrounded by a circle of red then an outer of blue. It still displays transmissions but the background target colours remain albeit slightly faded. Is this condition economically fixable or should I throw it away?

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Pls, soldiring his crt base, all pins

Posted on Apr 05, 2010

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The most common colour convention is:
Yellow: Video
Red: Audio, right channel
White (or black): Audio, left channel
Green; Centre audio
Blue: Left Surround
Gray: Right Surround
Brown: left back surround
Tan: Right back surround
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After changing the ink catridges and resetting the drum fuse lately (note: it is known that the fuse will be blown off after certain number of prints but otherwise is in good condition), my Epson Acculaser...


The repeating image is a ghost image, and here is described what it can be. Probably if you solve this, you also solve the red-dot problem. If possible, I would suggest to replace the wiper blade.
Repeating images on laser printerThis likely means a faint ghost of the main printout at a distance equal to the circumference of one of the rollers or photosensitive drum.

Depending on where the problem originates, this could be a bad wiper (cleaning) blade, faulty corona, or incomplete fusing.


  • If the distance between successive images is equal to the circumference of the photosensitive drum, it is a wiper blade, erase lamp, or corona problem.A residual latent image or residual toner is sticking to the drum and not being properly cleared.

  • If the distance between successive images is equal to the circumference of one of the fuser rollers, then the fusing may not be complete due to damaged rollers or an incorrect temperature setting.

It is easy to determine where the problem is located: Interrupt a printout in mid-stride (where part of the paper is between the toner/developer and fuser. If the un-fused image has ghosting, it is a fault in the area of the drum

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My bush tv has a light purple circle in the middle with a blue then green halo.It turns red to blue in the centre,is it worth repairing.


has any full tv image? if not is a vertical and horizontal circuits defectives, send to repair

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1 Answer

Does a crt need ac supply or dc one? In an lcd there's an inverter to generate an ac signal for varying the power supply to different pixels on a monitor in order to produce different colour effects,does...


Most CRT displays sold for use in the US & Canada (and probably everywhere else for that matter) require AC. This is because AC is the most popular mode as it is easily stepped up for long distance transmission and down for use in commercial, industrial and residential uses, by your local utility. Additionally, AC is affected by losses or resistance differently than its DC counterpart. All of these (and more) reasons reduce the cost of providing electricity to buildings and homes.

If the utility generated and delivered DC, then electrical devices would be set up for DC connections. Since there is 60 Hertz AC at your outlet, the CRT makes use of it, and converts it to whatever the internal requirements are. Stepping the voltage down and / or changing to DC (inside or outside the cabinet) allows for many parts of the circuit to work directly - and AC of nearly any frequency (not just 60 Hertz) can be produced as needed with electronic circuits inside the cabinet.

Colors, shading, etc on CRTs are the result of an electron gun at the back of the CRT. The gun fires electrons at tiny red, green and blue phosphorous targets on the front of the screen. When the target is struck, the phosphorous glows briefly. If the phosphorous is behind a red mask - it glows red (the same holds tru for green and blue). This same process occurs for each of the thousands of colored target on the entire screen, 60 times per second.

This is simplified explanation - there are other parts of a CRT. There are circuits that create magnetic fields the direct the electron both left and right in addition to up and down the screen. Without these circuits, there would be just one dot glowing on the screen. There are circuits for refresh rate, demagnetizing, brightness, contrast and more.

I hope this provided a good starting point for you and found it helpful.

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Screen series of coloured circles


The degusser is out .
When you turn the set affter its
been off awhile it makes a thud sound
and demagnatizes the tube thats
the degusser working . cost to
fix verries on makes 40.00 80.00
on 27"

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Attaching a surround sound to a Hitachi 60CX29B


the red green and blue are component video
to get the surround sound to work the red and white audio outputs from the tv go to the audio inputs on the reciever , and to get the digital surround sound the optical also has to be hooked up

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Television colour


your problem is simple it is called colour patch. it is basically due to change in direction or you must have shifted or tilted. it might be due to magnetic effect like spkr,telephone near by it.just remove from that location. put of the set for 15 minutes &put it on .problem will get clear. ask tv tech. to degauss it by dega.coil.it hardly 1 second job. regards

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1 Answer

Help,colour is wrong


Hi. The problem is either the degaus positor has failed which is an easy repair. Or have you recently placed hifi speakers or something with a strong magnet in side near your tv set.

Jun 04, 2007 | Bush 5693D 24" TV

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Color Problem:


in Monitor CRT Red-Blue-green cathode guns are there.. Mixing of these colour we can get the original colour chrominace technique. if any of the colour gun is faulty we would get more REad or blue or green picture. Measure RGB voltages. you can verfify which gun is faulty. if then check RGB processing circuits. Else there might be problem Chrominance colour decoder system. Contact service centre

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Sounds to me like a bad picture tube with circle rainbow like colors.Good luck.

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