High Def Forum - Your High Definition Community & High Definition Resource

Go Back   High Def Forum - Your High Definition Community & High Definition Resource > High Definition Viewing Mediums, HDTVs > Projectors
Rules HDTV Forum Gallery LINK TO US! RSS - High Def Forum AddThis Feed Button AddThis Social Bookmark Button Groups

Projectors DLP Projectors, LCD Projectors & Screens RSS -  Front-Projection (Projector) TVs
Please Note : This forum is for projectors that use a screen and not rear projection HDTVs. There is a separate forum for RP HDTVs.

Seems like this was caused by a bad lamp?

Reply
AddThis Social Bookmark Button
 
Thread Tools
Old 07-26-2017, 12:32 AM   #1
What's next?!
 

Join Date: Sep 2014
Location: Tucson
Posts: 10
Cool Seems like this was caused by a bad lamp?

I've got a 10 year old Mitsubishi HC1500 that developed a loud whine at start up which would quiet down after a few minutes.... I tore it down and found the color wheel had been rubbing on the exit window mounting screw on the mounting bracket - see attached png. The aperture and and bracket show signs of serious overheating! It looks like the lamp was focussed on the aperture plate (top middle and caused overheating and deformation of the color wheel bracket?! I had replaced this lamp in August of 2012 with what I thought was a OEM lamp... See attached box label (which I keep the old original lamp in).
Attached Images
File Type: jpg hc1500 cw.jpg (52.9 KB, 16 views)
File Type: png HC1500 Lamp Box Label 2.png (124.7 KB, 15 views)
Martolfart is offline   Reply With Quote
Old 07-26-2017, 07:19 AM   #2
Administrator
 
rbinck's Avatar
 

Join Date: Apr 2004
Location: Katy, Texas
Posts: 16,831
Default

It could be the replacement lamp put off more heat than the original. Also is the fan working?
rbinck is offline   Reply With Quote
Old 07-26-2017, 06:00 PM   #3
What's next?!
 

Join Date: Sep 2014
Location: Tucson
Posts: 10
Default Fans seem fine....

When I replaced the bracket and color wheel, the projector was pretty clean and all 4 fans working... Also, I almost always run in low power mode (at night watching movies)... I just wonder if anyone knows or has seen a bad lamp focus cause something like this? I can't see any real difference in the lamp geometries but it probably doesn't have to be off by much? I do know if this projector senses a fan not running it won't start or shuts down....
Martolfart is offline   Reply With Quote
Old 01-08-2018, 03:00 PM   #4
My plasma is High Def.
 

Join Date: Jan 2018
Location: Detroit, MI
Posts: 6
Default

I believe that Diamond lamps are very close to the original lamp that comes with the projector, although not exactly the same. They should have a bulb that is sourced from the exact same bulb manufacturer that your projector manufacturer sourced theirs from. However, it could be a third party housing. Not sure if that could be contributing to your issue. Regardless, do you know how many hours you have on the lamp?
chewyg is offline   Reply With Quote
Old 01-08-2018, 08:25 PM   #5
What's next?!
 

Join Date: Sep 2014
Location: Tucson
Posts: 10
Default Isn't Diamond/Ushio a Mitsubishi OEM lamp?

So this is why I asked the question, based on the bracket overheating, it seemed apparent the lamp focus was off. Like I said, the replacement lamp was sold to me as a Mitsubishi lamp.... I wasn't even aware Diamond was actually a brand name, I thought it was just some additional branding. Regardless, is there anyway to tell the lamp (OEM or otherwise) has this issue (before it melts down!)? I don't know exactly how many hours, but it was over a thousand, but not anywhere near EoL, and like I said, I almost always ran this projector on low power to conserve the lamp life). I had read you can generally tell there's an incorrect lamp focus because you'll see shadowing on the screen edges, but apparently not in my case. I eventually fixed this one myself, but now I use it as a spare/mobile projector. I am concerned it could do this again though!
Martolfart is offline   Reply With Quote
Old 01-16-2018, 02:02 PM   #6
My plasma is High Def.
 

Join Date: Jan 2018
Location: Detroit, MI
Posts: 6
Default

Diamond lamps are distributed through Just Lamps. This is the information they provide on their site about the Diamond Lamps line:

Diamond Lamps (Genuine Inside)
A Diamond Lamp combines the identical bulb installed in the Original Manufacturer’s (OEM) lamp with a new cage. The exacting standards put into component selection and manufacture means a Diamond Lamp will deliver identical performance to the OEM lamp but at a noticeably lower price, supported by an extended 6-month warranty.

That means that it is an original bulb with a third party housing. So it should be a high quality lamp unless the housing is defective. Perhaps that is causing your issue. I would contact your original retailer or Just Lamps to try to find out if this is a common issue for this lamp model in your projector. That might have give you more direction on the cause of the issue and if it may happen again.
chewyg is offline   Reply With Quote
Old 01-16-2018, 08:12 PM   #7
HD is addictive
 

Join Date: Sep 2009
Location: KC, MO area
Posts: 54
Default

I've got a lamp from Projector Lamp Experts w/ about 2,000 hours on it. Still using on Eco mode w/ plenty of brightness.
__________________
Sony VBL-HW40ES
73shark is offline   Reply With Quote
Sponsored Links
Go Back   High Def Forum - Your High Definition Community & High Definition Resource > High Definition Viewing Mediums, HDTVs > Projectors
AddThis Social Bookmark Button
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 10:53 PM.



Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Copyright ©2004 - 2018, MH Sub I, LLC dba Internet Brands