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Re: Hitachi TV green CRT tube
Good Day, optih;
Why do you think the TV's green CRT is not working? If that is the case I would think of buying a new TV, or spend about
$550.00 to repair the TV.
Good Luck, big IRISH. PS Only use a Factory Authorized Service Center.
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For CRT projection TV's, this indicates that the Green picture tube is burned (warn out). The less green that strikes the screen, the more redish the image will look. You will need to find an old school TV repair shop that knows how to replace picture tubes.
In the case of a DLP style TV, the color wheel needs replacing.
The most likely cause is a bad (shorted or open) CRT driver transistor on the green CRT board. Also check the solder connections on the connector sockets for wires that get plugged into on the CRT boards (and check all the CRT boards; not just the green CRT Board).
The next most-likely cause is a bad green CRT. Try tapping (gently!) on the neck of the green CRT and see if you get any green flashing on the screen. If so, then you've got a bad green picture tube.
Note: I am assuming you are an electronic technician with at least basic knowledge of electronics, and that you know how to solder and test components like resistors, capacitors, diodes, and transistors. If not, you better defer this repair to someone more experienced.
If it's bright green with light lines from side to side the green gun is shorting out. You would need to take the front off and look at the neck of the tubes. See if all three filiments are working. It will be a dim glowing in the neck of each tube. If you have filiment voltage but no red gun you may have bad solder connections on the CRT modules but being it's a Sony it could be a bad green Tube. If the green gun is shorting out call around to TV shops in your area and ask them if they have a Beltron or BNK Picture Tube Rejuvenator. Sometimes the short can be cleared using the right test equipment. Ask them how much they would charge you to shoot the tube if that's your problem. If it's no Red it may be bad solder connections on the CRT modules. I hope this helps.