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I would say the next thing to replace would be the ballast for the lamp and if that does not work the power supply board may have failed. When I replace the power supply, I also replace the ballast at the same time.
The lamp timer on the Hitachi projector must be reset whenever the lamp has been replaced. The "Lamp" indicator on the display will light red or the "Change the Lamp" message will display when the lamp timer needs to be reset. Hitachi recommends that the lamp timer never be reset without replacing the lamp and to always reset the timer when the lamp is replaced. The message functions of the projector will not function properly if the lamp timer is not correctly reset.
Turn the power on. Press the "Reset" button for three seconds until the "Lamp xxxx hr" message appears on the lamp timer on the bottom of the screen.
Press the "Menu" button on the remote control while the lamp timer is displayed.
Press the left arrow button. Select "0" and wait until the timer display clears.
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you will need a manual screwdriver to remove the panel. You need a soft non-abrasive cloth to avoid any contact with your fingers and the lamp assembly.
Turn off the Projector. After the unit has cooled down properly, remove the power cord from the outlet..
Remove Lamp Compartment Door. The lamp compartment on projectors islocated underneath the projector unit. For Rear Projection TVs, the lamp compartment is located in the rear bottom left or right side of the TV.. Remove the screws and the lamp compartment door.
Remove Lamp Assembly. pull out the lamp assembly disconnect any power cords that is still connected to the lamp assembly. Put it aside and don't get it confused with your new lamp!
Clean Lamp Compartment. Dust gets everywhere and while you have the projector open, use a soft cloth to remove any loose dust from the lamp compartment.
Insert New Lamp Assembly. reconnect any power cables to the new lamp if present and slide the new lamp into the compartment in the same orientation that the original lamp came out.
Replace Lamp Compartment Door. Set the lamp compartment door back into place and securely screw in the door without screwing it in too tight
the 3 blinking LEDs mean the lamp may be defective. Be sure the lamp is making contact with the sockets within the lamp compartment, also make sure the lamp is the correct one for your model. The set can be reset by unpluggimg the power cord for 5 minutes then plug it back in, if the 3 LEDs still blink check the lamp if its making contact and its the correct lamp for your model, suspect the ballast
The are controls on the inside of the tv above the circuit boards for focus and to turn up intensity of the projector lamps (red, green, and blu). If you turn it up too far all three projector lamps kick off. If this happens, power off the set and turn down the lamp that you turned up. Power it back on and slowly turn the projector lamp up until the picture looks OK. You have to take off the panel on back of set to get to the controls.