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Please check if the red and green tube have lights.Then if the green and red tube have no lights the problem is in the driver board of your tv.It is a major repair and need to check the repair technician.
If this has only started to leak recently, get an estimate from a local servicer for a coolant replacement for that tube. The coolant is corrosive and needs to be cleanedup ASAP from any circuit board that it has touched before there is damage. This is NOT a DIY repair. Expect a repair cost in the $300 range for parts and labor. If the set had a good picture prior to this, it may be worth the repair. This is your call. Do not delay however, as any delay will increase the likelyhood that there will be more damage that needs repair.
Before you replace the lamp I recommend trying to clean/dust the lamp component and lamp plug in area. I had the same problem and was able to resolve it by simply blowing the dust off the lamp components and fan. Use a can of high pressure air to get into the cracks and crevices.
From your description it sounds like G2 voltage on the green picture tube is too high. Are you confident about adjusting it yourself? There are high voltages in places which can kill. I will not take any responsibility of you getting an electric shock so I suggest calling in a qualified TV technician.
Any TV technician should be able adjust this voltage and it should not take long to do it unless the cases are hard to remove and hard to access the flyback transformer where the G2 (screen) adjustment is located.
Otherwise it may be a faulty green picture tube and this is expensive as you need to get the tube replaced.
If the repair center is an authorized Samsung service center, they should be able to get hte part for you. I don't have parts listings for Samsung sets, but the part numbers should be available from Samsung directly. Since you know the problem, try another service center that is associated with Samsung. Not all independent servicers can get parts from all manufacturers.
this is an idication of trouble with the red tube. it might be as simple as a crt board or the tube might need replaced. i would have to open it up and see. the crt could be leaking or the high voltage to that tube might be missing. as a technician i would have to see if the red tube or one or more tubes are powing up.
You dont need a new tube. What you need is to repair the seal on your old tube and replace the CRT coolant fluid. There is a coolant chamber attached to the tube with long bolts with springs on them that contains coolant to prevent your tubes from getting hot. Yours may just need tightening, but I would replace the seal just to be safe as thecoolant can and will destroy your circuit board if its allowed to continue to leak on it.