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We replaced it because the TV wouldn't turn on and we were getting a solid red LED on the tv. Checked the mitsubishi website and it told us that the lamp was probably burnt out if it wouldn't come back on after trying to reseat the lamp.
Replaced the ballast and it did not solve the issue. After replacing the ballast I put the original lamp back in and I would get sound but no picture, so I put the new lamp in and I would get sound and picture but after 30-45 sec the picture starts to degrade/flicker and then it shuts off.