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I recently replaced the ballast and the lamp, checked the color check which is in tack. I even tried something sill as swapping the light engine with the one from my HLR4667, I got a picture and it turned on!! :D ... but when I place the original light engine back into the HLP5067, it won't turn on. All the lights flash and I hear the click from a relay by the power board, the lamp doesn't come on though.
I need help in this matter. I don't know what to do next...
any suggestions???

Hello, this is a huge trouble shoot when you swap out a complete light engine! but we can start simple, how long has it been since you last replaced the lamp?