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Hi. Either there is a problem with the CRT itself. (short between kathode and g1), or the drivestage for this green canon is defective.
The voltage on the kathode is low. Normally green would be off at around 200V. In some TV's the driverstage is made of an integrated circuit, where one of it's outputs is defective.
HI. If it is not a problem with the CRT itself, look for bad solderings on the CRT socket. If it is in the CRT, you have very bright green with white stripes across.
The cause is one or more shorted transistors either on CRT board or on main or both. The colors are red,blue and green, you have a transistor for each and a bias trans. check each there are 6 in all.
sounds like your picture tube is going out, if its an old tv it would be best to let it die since its very costly to fix these problems. If its new you better get it looked at. It is a hardware problem, nothing you can do about it.
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