This thread helped me replace my OB about 5 years ago...thanks for that... but now I have a new problem. No picture, no sound, just 5 red blinks. Any suggestions?
Five red XBR2 means "lamp driver bad", aka ballast.
Fault indications in any set with a lamp are not always reliable in the case of "bad lamp" or "bad ballast". That's because all that lies between the two is a ~5KV pair of wires that are very difficult to monitor with 5v digital electronics.
As always, start with a physical inspection of the lamp. Consider what make of lamp it is and how many approximate hours are on it.
I can say that in my personal experience with my XBR2 that I had excellent picture for 3 years, above average for the next 2 years, then replaced my bulb, picture went back to excellent for 1 week and then I developed the green globs. Had to replace the OB at that point. Picture went back to excellent...until recent lightning strike.