I have a 25" Zenith

You will need to replace 4 capacitors. Locations and values are C 3460 which is a 25 volt 220 Mf capacitor, CX3218 at 160 volts at 1 Mf (could be 2.2Mf), C3416 at 25 volts 100 Mf , and CX 3413 at 50 volts 22 Mf. In severe cases you would also replace the powerling regulator,(STR-53041) I don't think you need to in this case. Now the green spot you speak of may be the need to resolder the thermistor. I don't recall the exact location. It is a small disk located on the edge of the main board near the power board connection( Your 110 power cord to board). I also believe there is a glass fuse near by. This is a two legged disk that is silver. Take care when soldering this. If it does break you may replace this with an RCA part# 207768. And lastly, when replacing the board back into the TV, make sure you have a good connection to the CRT with the suction cup. It should be tight fitting with no air to escape! Thanks for asking and show a few hands of support!