Bulb, lamp, whatever - least I spelled them correctly :)
I do NOT have any time to go pulling things apart, bossman. Being part-time at two schools means that I never have enought time to do my normal stuff, without adding to the list! It would take me a long time to do which would mean the teacher was without a projector for a while.
Have searched and cannot find any info on cleaning it anyway. Definitely wouldnt try without some sort of 'how to' guide.
TBH it is probably been caused by lack of filter cleaning as it is a job I hate and avoid doing if I possibly can.
I will replace the bulb if I have a spare - but does no one know of anyone who will repair it for me down here?
How may hours do you have on it? has the lamp been changed at the correct times IE. 2000Hrs it sounds like its had an over run lamp beyond it hrs and the high UV then produced has scorched the polerising filters, Deep cleaning is not an end user task, it has to be completly dismantled in a dust free room and rebuilt optical engines are not ajustable by end users.
The only other things it may be is a collapsed lamp but it would be highly unusual, last thing it may be also rare would be LCD problems, i would need to see it if you IM me a picture i can help you more or you can ring me for FREE advice.
It literally looks like someone has drawn a large yellow rectangle with highlighter pen, about 30cm per side, on the LHS just below the centre line. The teacher was convinced it was on the board and even came and asked me what to use to get pen marks off with!!
I've actually got a yellow lamp projector here so your not alone witch. The HOD doesnt want to buy a new bulb so it looks like it's going to be staying yellow :S
I need more detail to help you with it even a photo of it would help. email it to me for FREE advice.
IM me for email address as i dont know if i can put it on here any other way.
Will try and sort out a photo tomorrow, thanks