Before you sink 500 into the signal bd I would double check the crt bd for the green gun
There is a couple of resistors on that board that go bad (open up)
this does not sent the signal in
Did the tech use a scope to determine weather you have signal to the crt bds or did he just switch the crt bds from one to the other ? I bet if you change the crt board or ohm out the boards you will find a open resistor
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If you find the remote sensor eye located on the front of the TV, you are there!!! There is a small sensor board and a TV tech will have to replace this for you. There is usually a capacitor, resistor or diode that will need replaced. I replaced the remote sensor board. Thanks for asking and show a few hands of support.
The color signal consists of Red, Green and Blue. Those three colors, at various degrees, make all the other colors on your screen.
If you have a BRIGHT green screen it's best you don't operate your set. If it's just tinted green then there is a problem on the CRT (Cathode Ray Tube) drive board. Do check your "tint" setting and see if someone misadjusted it. If that isn't it then you need to have your set on an electronics bench and get an estimate for repair.
This could possibly be a bad picture tube, but it's more likely bad solder connections causing the blue signal to be lost. The parts (the output transistors or integrated circuit) that develop the bad connections are often located on a small circuit board connected to the back (neck) of the picture tube, or are found on the main board. You can call for service and get an estimate, or try to repair it yourself if you are comfortable with electronic soldering. It is also possible for these parts to fail (they get pretty hot), and more advanced troubleshooting skills would be needed.
No picture, just black screen
Check R3414, an SMD chip on the CRT board. There could be invisible bad solder joints
Replace relay RY481 on S2 board
Picture int disappears leaving snow on screen
Resolder the Xtal in the tuner
if it cannot be adjusted then there is a problem in tv.
as your green color is absent you will get
your problem is in green video ckt
1 sypply to green cathode ckt
2 loose contact in crt base
3 loose signal connector
4 check components related to green cathode& green video tr. itself
5 check for green signal is coming to green video section from processor.
6 signal processor ic
if you are not tech person get it done by skilled tech.
it is a common problem.
it is a not a major problem.
Green Screen with some lines
lines are called retrace lines.
it is due to
maybe dry soldered or no green drive signal. This problem can be fixed by complete soldering in crt board.
1 green video supply absent
2 loose contact in green skt in crt board
3 crt board loose
4 no green drive signal.
check on crt board green amp transister and associated ckt should be short. or green drive transister,or main jungle ic which drive green signal is sure defective, i had the same problem in rca 32 inch tv for all screen red,replacing chroma ic solved the problem.
this symptom is characterised by the loss of one or two primary colours. this symptom can be classified into three cases: 1) loss of red colour, 2) loss of colour blue,3) loss of green color. this symptom may be caused by a trouble in the colour demodulator, in the color amplifier or in the colour subtraction amplifier circuit. in your case loss of blue colour. this is a very complicated problem that you need some special test equipment like oscilloscope and color pattern generator in order to trace the signal. tune the receiver to a color broadcast station(a colour bar generator can be used to transmit a colour signal to the set). check the Z-axis demodulator, z-axis amplifier and the B-Y output circuit for the chroma signal. observe the signal process with an oscilloscope. if the color signal is not present use a VOM to locate the defective component in any of the above circuits. check the transistors and the resistors in the collector circuit. good luck!