RCA HDTV HD52W59

Hello pac997man,
This may mean a few things. The Green CRT might be defective, the video signal to the green CRT might not be present, and the high voltage to the green CRT anode might not be active. So lets tackle the first possibility:
1) The Green CRT might be defective: You will need a CRT tester to check to see if the green tube is functioning, or you can measure the voltages on the pins of the CRT and use the schematic to compare them. If the tube is bad it will need to be replace (this usually requires that the other tubes be replaced also to maintain color balance)
2)  The video signal to the green CRT might not be present: This problem can be tested by measuring the video signal on the cathode of the green CRT and comparing it to the test signal on the schematic. This test also should be performed on the IC that controls the video input/output (oh yeah this means that you will have to have a signal generator to provide the proper test pattern, and a schematic to do this test)
3)  The high voltage to the green CRT anode might not be active: This test requires that you use a high voltage probe to measure the anode voltage of the CRT, if you have no voltage there this could indicate a problem in the HV Trippler. Since the other two CRTs are working the chance of the IHVT (Integrated High Voltage Transformer) being bad is very slim.
 By now you are wondering if I intend for you to try to do this yourself? The answer is : No I do not. What I would suggest is that you take the TV to a qualified TV repair shop or have them make a house call to troubleshoot and fix your YV.
I hope this helps
Thank you,
Shuttle83