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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Sharp XG-E3000U lamp dimming
I've been using this projector for about 6 months with no problems
until last night. It was working fine for about 90 min, then the lamp suddenly dimmed to about half brightness and I could hear a buzzing noise similar to the sound it makes when the lamp is first starting. I immediately shut it down for about 5-10 min. After powering it on again it worked for about 55 min before doing the same thing. The lamp was used when I got it, so I don't know how many hours are on it. Does this sound like the lamp may be failing? I've seen two of these projectors with bad power supplies and only one with a good power supply (this one). Are there any known causes for the high failure rate? Is there anything I can do to prevent it? Both of the bad power supplies had a burnt out inductor and shorted power MOSFETs in the lamp supply. It uses the same power supply as the XG-E1200U and XG-E3500U. I have the projector apart right now to clean the filters and check for obvious problems. Andy Cuffe |
#2
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Sharp XG-E3000U lamp dimming
On Thu, 23 Mar 2006 10:31:43 -0800, Andy Cuffe
wrote: I've been using this projector for about 6 months with no problems until last night. It was working fine for about 90 min, then the lamp suddenly dimmed to about half brightness and I could hear a buzzing noise similar to the sound it makes when the lamp is first starting. I immediately shut it down for about 5-10 min. After powering it on again it worked for about 55 min before doing the same thing. After putting it back together the lamp didn't even try to start. I checked the lamp start circuit and found a shorted thyristor. I'm guessing the lamp was dimming because the start circuit was activating while the lamp was running. The bad part is a Toshiba SF8JZ47. I subbed it with an NTE 5558 and it seems to be working fine again. Andy Cuffe |
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