I have a bush colour tv and there is a blue,green,red colour wash right across the picture so people''s faces look half blue,green red....sort of as if there is a rainbow across the screen.. i do not have a plasma, i have a telly thats about 5 years old + freeview box-after checking this and normal telly which is the same...all i can think of its a problem with the tv itself? My tv is a Bush 2177NTX colour tv.

T con board issues.

Your problem may related to the green output or driver stage in your tv. Usually green calour is not tranmitted, only blue and red colour informatein are comming from transmitters. Green colour information is regenerated inside the tv by matrix network. If the matrix get damaged no green colour will be displayed. To check first; whether the TV colour picture tube's green gun is right or not. For that you must connect a resistor of value more than 470k 2W, to the green cathode of the picture tube base to earth. The connection should be done causiously, not for a long time. It is advised to do in intermittantly with just touches. When you touch the green cathode with the resistor with one side of it earthed, a green flash must come on the crt. You can do this test for red and blue too. If there is no green flash, or light picture tube may be faulty. It is a very rare case. You must check the volltages of the other two cathodes [red and blue]. The voltage at green cathode must be almost the same as other two.
Just check the green output transistor for open. If it is open, voltage at green cathode will be high. Also check the base voltge of the green output transistor. It should be around 2.5vDC. You can compare the base voltages of the other two transistors with green drive base voltage. If there is no base voltage, the fault should be in the matrix section. It is inside an Ic. Philips usually uses TDA series Ics in chroma section. Check the Ic pin voltages according to service manual and try to rectify the fault. It needs a technical knowledge and skill.

The series of the cable should go green red blue into the back. if you put the green in the red and the red into the green it give the TV a red base to go off of for the picture so everything is red. The reason the green cable won't is because it transmits a black and white picture which allows it a nice base to add the green and red to.

I would try a new T-CON board first.

You have a problem with the blue and green tubes having a fungus growing across the face of the tube, thus blocking the light/picture. This will cause the color to be way off and the focus as well. Need to have the fluid changed in blue and green tubes. The red never seems to be affected...must be the red wave lenght inhibits the growth of algee or something. Anyway....That's what you need, not the convergance chip STK's. Trust me on this. T.V. tech. for over 20 years...see this ALL the time. Good luck.

The picture tube of the tv has 3 color in CRT Red, Green, Blue. The red cathodeof tv set has no function, its either the resistor become higt resistance, that why u need a repairman to replace it.

You can start with the make, model and age off the back of
the TV..........................T.

Hi there, this is easy thing to fix. Its LDV cable. This is the Cable which goes from the main board on to the screen. Un plug the cable from the screen side., then push the cable back. Make sure cable sits in .

This will sort all the problems with the picture,i.e colour problem , picutre squring up and many more things.


Regards Sam

Hi there my t.v has a similar problem, I turned it on and the colours arn't right, there the colours go out in three circles mainly mainly blue, green, red yellow, but depends whats showing on the t.v? Please help.

Can you post a picture of the Tv with the issue stated?