Benq W1070 fan rattle fix. Well, really 2 fixes..
I don't post often but I do come here for answers. I figured I'd share some info that may help somebody else.
The issue is a rattling fan in a Benq w1070. The projector was only used outside for the first year and a half and stayed in its box when not in use. It only had about 20 hours tops.
I recently mounted the projector inside the house and it looks fantastic. After about the 140hr mark it started to make a rattling noise after it had been on for a while. I couldn't really hear it during loud scenes but as soon as it got quiet it was like I was sitting under an old movie projector.
I soon found that a replacement fan on Amazon was about $68 and could take several weeks to get. The only other suppliers were in China with 30 day shipping and at least $40 with shipping not to mention the unknown reputations of the sellers. I started to look for a replacement with the same specs when I realized the I should really look at replacing the bearings in the fan. The fan is spec'd out with 2 shielded ball bearings.
I took the w1070 apart to get the fan out and then disassembled the fan to measure the bearings to order the replacements.
If you are not aware, the fans are only held together by a tiny "c" clip on the end of the shaft. Remove the round sticker on the fan housing to reveal the clip and one of the bearings. There is a small preload spring on the shaft to keep an eye on.
To disassemble, put the fan inside a clear plastic bag and use 2 small picks to pry the clip off. The plastic bag keeps the clip from flying off and being lost forever.
The bearings measured 8mm tall, 4mm wide, and 3mm bore. There are 2 of them in the fan and they are a light press fit and are easily removed. There are no marking on the bearings.
If you look on eBay, you can get them for about 10 to 15 dollars for ten of them including free shipping.. AND it only takes a couple days to get them.
I reassembled the fan but before I did I stretched the preload spring a very small amount. Remember a little goes a long way on that spring. I reinstalled the fan and buttoned up the projector while I wait for the bearings. The projector was mounted back on the ceiling and reconnected. To my surprise, the rattle sound Is gone, without the new bearings.
I did not take any photos of the disassembly but I will when the new bearings get here.
The bearing size I listed above is for the fan in the front of the projector next to the lens. I have not checked the other fans but I can't see why the same fix wouldn't work for them the same way. Try it and if it doesn't work, you needed to take the fan apart anyway to measure the bearing to order new ones.
Last edited by kev249; 04-13-2015 at 04:01 PM.