I have a mid-sized projector (Optoma HD142X). After about a year, and perhaps because of the recent warmer temperatures and therefore more internal fan use, the unit makes an irregular and intermittent whirring/buzzing noise. Projectors get quite hot and have a big fan. I wonder if it might be the fan, for example a lack of lubrication or build-up of dust. I read the user manual and online forums at the manufacturer, and didn't gain much insight other than a recommendation to send it to the factory for service.
- How might I determine the problem at home?
- Are there any fixes I could try without opening the case and voiding the warranty? For example, would compressed air help?
There's very little tool access through the exhaust port. Thanks for any ideas.