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Does the TV appear to be cycling on and off, like its attempting to boot up? Or, does it just not come on at all? Don't miss the lamp door interlock switch. Many Samsung DLPs have tempermental door switches. Try re-installing the door or manually hold the switch in the closed postion and try to power it up. If the lamp comes on and stays lit, you've found your problem.
You need to do an aggressive reset on the TV. This solved problem
completely for me. You must unplug the TV when it is on. Repeat this
several times until the TV is jolted back into the factory default
settings. The issue is actually with the programming I believe. The
clue was that the display worked 100% perfect in HDMI mode, and the
problem only existed in the cable setting, no matter if wires were
attached or not.
Again, do an aggressive reset to the TV by unplugging it several times
while it is on. It may not register the reset at first because after
all, the actual problem is a programming issue and it's having trouble
recognizing commands in the first place.
This sounds similar to the same problem I had with my TV. I went out and purchased a new light thinking it was the source of the problem, but I was wrong. It turns out the color wheel and fan went bad and it cost roughly $575.00 for the parts and labor to fix it. My tv was the hlr6167w
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