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Please check the filter to the lamp, clean and reset. A poor cooling of the lamp can cause this issue . Secondly a failing lamp also is a reason. If there is no result then you must check with the service center for a consensus .
u have not mentioned how long u have been using this projector. either the lamp life is low or the circuitry protecting the lamp temperature is defective or even the air intake of the fan is inadequate, a filter is fitted for air flow if this is clogged or blocked, lamp temp will rise and unit shuts down. if lamp indicator is yellow or red it is time to change the lamp. if it is red - lamp is totally out, if u turn on the unit four times without replacing lamp, the unit simply wont turn on. one other possibility is power cable and power connections. check power cable too.
Main line fuse is on the board where the ac cord plugs.
The caps in the power supply usually leak and explode after 5 years, blowing the fuse. Solution is to replace the power supply and lamp ballast boards. Expensive repair.