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Bypassing lamp detection circuitry in videoprejector

 
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beatrice



Joined: 13 Jun 2014
Posts: 1
Location: France


PostLink    Posted: Fri Jun 13, 2014 12:47 pm    Post subject: Bypassing lamp detection circuitry in videoprejector Reply with quote


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Hello,

I'm having a problem with my video projector. The lamp went off, I want to replace it with a pcb with LEDS. The problem is that I need to bypass the lamp detection circuitry so that my new lamp can work with the motherboard. I know I have to cut off two wires and connect two others to bypass the detection,I think it's the yellow or the blue one ( on the 2nd picture, the one removed). But I 'm not sure.... My projector is a canon sx6. Here's some picture of it. If anyone could give some help, it would be fantastic. Thx a lot.



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JayAllan



Joined: 03 Jun 2007
Posts: 175
Location: Los Angeles


PostLink    Posted: Thu Jun 26, 2014 4:21 am    Post subject: Reply with quote

Would love to figure this out myself. Not sure what the light output is on the OEM bulbs but I doubt you could get enough LEDs in the space the other lamp was in however.
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AnalogRocks
Forum Moderator


Joined: 08 Mar 2006
Posts: 25470
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Thu Jun 26, 2014 4:27 am    Post subject: Reply with quote

That would be sweet for all those dead $800 bulb'ed projectors that are laying around.
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winny



Joined: 09 Oct 2013
Posts: 401
Location: Sweden

TV/Projector: BD808s, BG1209/2


PostLink    Posted: Thu Jun 26, 2014 6:59 am    Post subject: Reply with quote

http://www.instructables.com/id/Fooling-the-projector/step2/Bypassing-the-control-module-1/

The easiest but most dangerous way unless you know what you are doing to find the equivalent power-good/lamp-on-signal in your projector is to probe it while the projector is still working. If you can locate the lamp-drive PCB which should be separate, it shouldn't be too hard to narrow this down anyway.

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macgyver655



Joined: 22 Aug 2007
Posts: 8508



PostLink    Posted: Thu Jun 26, 2014 1:39 pm    Post subject: Reply with quote

I have already assisted others in the past (some members here) to disable the protection circuit is various makes, including JVC with no problem. However the led replacements were not bright enough, even with led groups.
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Jeremy112



Joined: 28 Sep 2006
Posts: 2643
Location: Fond du Lac, WI


PostLink    Posted: Tue Jul 01, 2014 2:34 pm    Post subject: Reply with quote

There are single chip 6000 to 10,000 lumen LEDs available for DIY uses. These are more than bright enough, but they run quite hot and require a good heatsinking solution to keep them from burning out. I have seen many modded projectors with LEDs that worked, but were dim. Those projectors weren't even using LEDs anywhere near 6000 lumens or even 4000 lumens.

You also need to keep in mind that that lovely glass shroud on original lamps is specially designed to reflect the light at a certain angle into the projectors light path. So a similar shroud would be ideal on the LED as well.

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