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try adjusting it from the remote and from the buttons on top. if neither work there is a connector from the main board to the lens contacts you might be able to see it and adjust it having taken out the lens (bayonet with lock button. if all still fails I have a few spare main boards from lcd dead projectors, reasonable to replace. email me firstname.lastname@example.org
hi, Go to menu and then select main. then select reset and execute it.After that try to adjust the brightness and contrast. Remember on thing, in some projectors the brightens and contrast will be active when there is video signal. also try that. ok
When you have no inputs into the projector let it enter standby mode, then press down, then up, left, then right. This will take you into the service menu. Once in the menu find the adjust option , scroll down to the 3rd line 2111-16 (POS_CNT2) and change that.
If you do not have a remote here is how to reset the filter time. Use the "Menu" bottun to get the "easy menu" to display. Push the down arrow until you get to "Filter Time," then push and hold the RIGHT arrow to reset the filter time. DO NOT try to reset using the "Reset" option on the easy menu, it will not work.
My projector is not Hitachi but I had a similar problem. My manual suggested checking under "signal" to make sure that "auto" was "on". The thing is, there were two places where "signal" came up on the menu. I had to go under "set-up" to "signal" and then I was able to correct it by setting "auto" to "on". I hope this helps.