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Most likely reason is a blocked air filter, preventing sufficient cooling air from reaching the interior of the case. Remove and carefully clean, by washing in warm soapy water, or replace the air filter sponges. NOTE! If the sponges are old, they may fall to pieces when you try cleaning them, so you may have to source replacements from a Sony Service Centre.
Alternatively, one or more of the cooling fans may have a faulty bearing causing it to rotate slowly, requiring that it be replaced.
There may also be a problem with capacitors in the projectoirs power supplies
no power to the pojector, means:mainboard not work, it need to be repaired Have a good day! Jerry China Tel: +86 131788 67858 E-mail: email@example.com Skype: lampdeng.com YM: firstname.lastname@example.org http://facebook.com/lampdeng http://www.lampdeng.com
lamp ballast and/or power supply is going. the ballast has to boost the charge up to 140 vdc, and after it's up to it full strength, it drops down to 40vdc to maintain. if the ballast can't get up to the proper voltage, it shuts down. or the lamp itself will not hold the voltage, and therefore needs replacing.
I believe this indicates a lamp failure. Make sure the lamp is seated correctly. If you haven't checked, take the lamp out and look at it. I left off a connector (the yellow wire I think) once when reassembling an mt1050 and had what I believe was the same indications. If you have taken the projector apart double check that all the wires are reconnected. Other than that I'm not sure.