bertster Posted October 14, 2011 Posted October 14, 2011 The image given by our Sanyo PLC-XE40 is very yellow. I've stripped it down and cleaned out the insides, including mirrors etc (it wasnt too dusty inside, dispite surviving building works all summer), which made the image slightly brighter but still very yellow. Anyone any ideas to what may be causing it? Lamp isnt too old, replaced approx 8 months ago - although we dont have a new one to try, but I suspect its not the lamp. Thanks
Oaktech Posted October 14, 2011 Posted October 14, 2011 panel degradation... we have some ed-x12s and nec vt575s doing it. i reckon it's time for a new projector as the repair cost is very close to replacement.
Marc-Engineer Posted October 14, 2011 Posted October 14, 2011 Its glazing and scorching of the polerising filter due to late changing of the lamp, the UV output of the lamp goes up exponentially as it ages above around 2500Hrs it will start to burn the polerising filters the ultimatly the LCD panels, changing the lamps is the most important way to lengthen the life of your projector, Many people think its the heat that causes it, its not its the UV output of the lamp (like sunburn). Often you can change the filters but they then need setting up or you will no longer be able to get true black, not a job for anyone but a trained engineer as it has to be done while on. I hope you didnt touch the front silvered mirrors? Marc Projector Engineer
bertster Posted October 17, 2011 Author Posted October 17, 2011 I hope you didnt touch the front silvered mirrors? Mark, I followed the instructions on a previous edugeek thread re cleaning the sanyo projector - I did clean 3 mirrors in the light chamber - are these the ones that you say I shouldnt have? Be good to know as planning to clean another 2 tomorrow?
LeeBirdptinstalls Posted October 18, 2011 Posted October 18, 2011 Its what we call screen burn. Cost of repair is expensive when compared to a replacement unit. Im afraid it will be a new unit as the problem will only get worse.
ICT_GUY Posted October 18, 2011 Posted October 18, 2011 Never allow teachers to use no show, its the fastest way to kill the projector!
LeeBirdptinstalls Posted October 18, 2011 Posted October 18, 2011 it allows the teacher to hide whats on their pc/laptop and stop it being displayed by the projector. ideal in tests
Marc-Engineer Posted October 25, 2011 Posted October 25, 2011 Yes the front mirrors on the optical engine are best left untouched use a dry air blower if you have one but this should also be done in a "clean" area and i mean dust free not an ordanary room or workshop, this colouration is NOT on the screens (LCD) it is the polerising filters that scorch from not changing the lamp at correct times or not having projectors serviced. Marc Projector Engineer
Butuz Posted October 25, 2011 Posted October 25, 2011 Great thread. I've got a couple of projectors like this. One has gone really yellow the other pink! Nice to know for sure that it can't be solved by cleaning or a bulb change! Butuz
Marc-Engineer Posted October 25, 2011 Posted October 25, 2011 Ahh pink is another thing that is normally dust on the Elements inside and can usually be deep cleaned and sorted easily. But not a job for a school a deep clean is a complete strip and rebuild (cost around £70). Marc Projector Engineer
ranj Posted October 25, 2011 Posted October 25, 2011 Like others who have mentioned, get rid of it. We had those models of projectors in my last place and had the same issues.
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