Hitachi CP-x430 "Check air flow"

Open the cover. At some ends there will be 'filters', to clean the air entering the projector. If these filters are blocked with dust or lint, air flow will be blocked.
Clean any dust from these filters. Close the cover and check whether your problem is solved.

Unclip the air filter covers and remove the filters, making sure not to let the dust stray into the machine.
Clean the filters. Depending on the type of filter, either wash them in mild washing up detergent or replace them if they are the paper element type.
That is all one can do without stripping the machine down and clean the vanes on the fans.

Check your owners manual. This means that the air filter needs to be cleaned or that the projector has become too cold. My guess is the first one. The owners manual has instructions for cleaning or replacing the air filter :)

Good luck!

Here's the PDF to your particular unit. Check out page 28 of the PDF (Page 27 on the actual manual) Good luck!

http://www.hitachi-homeelectronics.us/supportingdocs/forhome/DisplayTechnologiesGroup/lcdprojectors/SupportingDocuments/01CPX385EN.pdf

There is a menu item which has both the lamp hour reset and check air flow, etc. You must go into the menu and reset the air flow item. MAKE SURE YOU CLEAN THE DUST FILTER!! Heat is the number one killer of projectors and Hitachi's run "hot". I clean my projector once a week--Hey, I'm not rich. lol! Also, excessive heat will cause the lcd panels to fail prematurely and cause lots of other components to do the same.--Rick

Hi there

Look at the bottom of the Projector , you'll see a thin grey line with two edges on it. That is the filter. Grip on the sides and gently pull it out.

the Lcd panels are fault
or
the polarizer isfault

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clean filter and reset the filter timer by advanced options filter timer and hold reset till menu shows then arrow up and it will zero out.

You need to clean the filters. When the filters collect alot of dust on them, they block the airflow to the internal parts of the projector and can cause the bulb to blow due to the temperature getting to hot.

With most projectors there is a foam air filter behind a grill that is the opening to the cooling channels. A fan ensures air flow to cool the lamp, etc. This filter prevents dust from gumming up the works (and depending on design) may prevent dust getting into the optics. As the filter gets dirty it gradually cuts off the air and at some point a protective circuit kicks in and turns off the lamp.
If the projector is on you will feel a stream of hot air coming out of the exit vent. Projectors vary in terms of amount of air flow, so its difficult to define what is normal for a specific model. However, you can simply hold a hand in front of the vent and see if there is air flow (It will be hot air so, careful). If there is a "good" stream of air things are fine, but if only a very light flow is felt the filter may be dirty.
If the filter has not been cleaned or replaced recently make sure the projector is turned off and cooled down then take off the inlet cover and remove the filter. Clean or replace per the instructions for the projector (and periodically as defined .. but taking into account the operating conditions). Once cleaned turn on the projector and feel the "normal" air current for future reference.
Heat is one of the major causes of projector failure, so make sure cooling vents (inlet and outlet) are not obstructed and filters are kept clean