InFocus LP600 powers up, lights the lamp, then powers down without prompting - will not repower until 20-30 seconds pass. The familiar computer fan / projector fan noise is heard (as a short burst, to announce it is ready to power) the green LED is lit, and the unit may be powered for another 20-30 seconds - and repeats all steps above. Capacitors? Overheating? It makes an image, but quickly shuts off.
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If you replace the lamp but do not reset the lamp hours then the projector will not ignite the lamp to stop it blowing up the lamp and causing further problems. You can reset the hours without the image, on the x2 version you turned on for 1 minute then held down the volume up and down buttons for 10 seconds but all versions vary. The infocus website can usually tell you how though you may have to look for it a bit. Failing that try a firmware update available from the infocus website that should erase its brain so you can start again, hopefully you have kept the original leads it was shipped with to do this otherwise it will cost you another £20
i had the same problem with my 2 years old infocus lp600. on the mains section of the power supply board you have 4 100uF/16v and 1 4,7uF/35V electrolyt condenser of a 85 degree type. that means it will work 2000 hours at 85 degree (celsius). since the power supply only switch off the lamp in standby with no fan the power supply get hot- i think about 70 degree. so after two years in stanby it is evident that this condensers loose halve of their capacity - after switch off no new start. changing this condensers with new ones of 105 degree type will solve tis problem. and for the future - no more stanby.