I have a Samsung 61" HLS6187WX/XAA that is about 8 years old. When I turn on the TV I can see from the back of the TV that the lamp turns on and off and hear the color wheel trying to spin, but it's intermittent. I can hear intermittent clicking (whining up and down) noise. I have replaced a lamp about an year ago. Also, I have replaced both ballast and lamp within this week, but still no luck. The TV is still doing the same thing. What could be the problem?