A viewer sent this in when it started shutting down after getting too hot. An old lamp assembly had ruptured leaving a chunk of glass in the blower fan causing it to lock up. After removing the glass, the projector ran great.<br /><br />If you ever have a lamp explode or lose any pieces of glass in your projector, be sure to listen for bits that might have landed in the blower fan. This is a common issue among all DLP projectors and LCD projectors that use directly connected blower fans for cooling. <br /><br />*Note, About the fan frequency, I think the 97hz on the scope = 2 pulses per revolution on that fan. <br /><br />2900rpm(target), 48.3rps(revs per second) x 2= 97hz(cycles per second). If I am wrong here, please correct me and help me understand where I was wrong. <br /><br />Thanks for watching and I hope you all are having a great year so far.<br /><br />If you need a lamp for this model go here and use code YT50 at checkout. <a href="https://www.purelandsupply.com/benq-lcd-projector-lamp_ht2050.html" target="_blank" rel="nofollow">https://www.purelandsupply.com/benq-lcd-projector-lamp_ht2050.html</a><br /><br />\O/<br /><br />00:00 Intro - Hello!<br />01:46 Remove/Check Lamp<br />03:32 Begin Disassembly<br />07:55 Initial Testing<br />09:07 Check Service menu (Press Menu, then Enter/Source at the same time)<br />10:41 Final Disassembly to remove blower fan.<br />16:39 Examine jammed fan, remove the glass<br />23:03 Re-assembly begins<br />30:55 Check fans with DMM<br />34:17 Re-check fan rpm in service menu /Initial Testing<br />35:44 Check fan status with oscilloscope <br />38:57 mystery screw<br />40:25 Continue assembly<br />43:52 Plastic film unpeeling. <br />57:45 Final Testing<br />1:00:40 Cause of Problem<br />...<br /><a href="https://www.youtube.com/watch?v=JseEuPJ1g6g" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=JseEuPJ1g6g</a>