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DIY replacement lamp for projector
DIY replacement lamp for projector
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Old 24th August 2005, 07:58 AM   #61
jamesbeat is offline jamesbeat  United Kingdom
diyAudio Member
Join Date: Aug 2005
by the way bruwed, thanks for the above post, it was the most useful one i have managed to find on this subject.
sorry, but i'm new at this (although i do have some electronics experience) so i'm still unsure about a couple of things:

how do i tell what voltage and startup requirements i need, and how do i find a lamp with the same specs? all the lamps i have found on the net in the uk tend to be from aquatics or 'herbal' growing companies and they don't list specs, just classify them by wattage. could this be because all ballasts used by these folks are the same type?
i have even seen electronic ballasts that the vendor claims will run ANY mh lamp of the right wattage.

all the literature i have found seems to say that any ballast will run any lamp as long as the wattage and strike method are the same- they never mention the voltage.
i don't mean to contradict you- what you say about voltage makes perfect sense- i just don't know how to go about buying the right lamp if the vendors don't supply this info.
the only thing i can think of is that if a certain gas needs a certain strike method, buying a lamp that matches the strike method automatically means the voltage is correct too?

when you want to replace a lamp that you have already modified, how easy is it to pick out the muffler cement? i like this idea because i had been trying to work out how i'd attatch the lamp, yet make it removable when another replacement was necessary.
by the way, if anyone from the uk is reading this and wants to try something similar, muffler cement is called 'exhaust putty' here.

i would really like to use the original ballast if at all possible, but if not i believe i have found out how to trick the pj into thinking the bulb's ok (i have the service manual )

bruwed has done most of the work- (and appears to be the only person who has had the courage to remove the arc tube from a mh lamp!)- if we work on this we could get a tutorial together so other people can retrofit their commercial projectors. there certainly seems to be a lot of demand for this.

with the dirt cheap prices of lcd projectors on ebay with burnt out lamps, this could be the best thing to happen to diy projectors ever!
i don't mean to belittle the efforts of all the diyers here, but not everyone has the time, cash, technical ability, or room for a diy pj
i think that some people go the diy route because they want a cheap functional projector, not because they enjoy the challenge.

my reason for wanting to learn how to relamp old pj's is because, although i could afford to buy the proper lamps, i resent the artificially inflated price (and i want to feel smug)
also, if i do this, my friends will take the plunge and buy an ebay bargain- then we will all have home cinema!
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Old 28th September 2005, 07:28 AM   #62
pattycakes is offline pattycakes  United States
diyAudio Member
Join Date: Sep 2005

what ever happened to your mitsubishi s120?
i am waiting for my telex p1000 to arive in the mail ( broken bulb) from what i understand these are the same exact projector.

did you just use a different bulb with the current projector and psu or did you do soemthing else. all \ any details about your s120 would be much appreciated
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Old 26th February 2006, 08:02 PM   #63
carozoynarizota is offline carozoynarizota  Argentina
diyAudio Member
Join Date: Apr 2004
Location: Buenos Aires
Originally posted by Tuga
I now have it working with a 15v 150W halogen bulb image is only visible with the room lights off but its ok, maybe a bit on the green side.
Tuga I have some questions about it.

S120 uses a 150W MH Lamp, according to what I know they had an efficiency rate above 80%. Thus mean only 30W are dropped due to heat conversion.

An halogen lamp have an efficiency of aprox. 20%, so you will have in this case 120W that are converted to heat instead of light.

Have you done something to avoid increasing temps inside the equipmen for using this new lamp??

The other question is about how bright it is the image. A MH may have half the luminosity at the end of its life. That means that a 150W (120W whithout the 30W from the loss) may behave as a 60W one. But the halogen starts giving us only 30W out of 150W, thas half the MH a the end of its life. Is it still usable the S120 in that condition???
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Old 17th July 2007, 11:13 PM   #64
supersan is offline supersan  United States
diyAudio Member
Join Date: Jul 2007
Default thanks tuga

just regd. to say a hearty thanks to tuga for providing such valuable info about this circuit.

I own a Kodak DP1050 and I was successfully able to isolate the opto-isolator and now the projector is running without a lamp.. all i had to do was short-circuit the red and the middle wire and now it runs on its own.

so now i've joined the looking for a replacement lamp club.. if anyone has any ideas on what works best please reply to this thread..

again thanks a million for all the diags and insights.
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Old 13th March 2008, 03:51 AM   #65
fettt is offline fettt  Canada
diyAudio Member
Join Date: Mar 2008
Default 3M mp7730

Hi all! this is a old tread , but i need your help.
I just purchased a 3m projector without lamp. This doesnt turn on.
I can send some picture , or if someone can guide me how to!
Thx alot!
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Old 24th March 2008, 10:56 PM   #66
atoz is offline atoz  United States
diyAudio Member
Join Date: Mar 2008
Hello, I am new to the forums. I have just purchased an Infocus LP690 from ebay. I am dealing with similar issues, and have the same 3-wire connector from the igniter board to mainboard. However, I have 3 opto sensors next to this connection.

Tuga notes:
As I said, the igniter and optos are no longer inside my projector so Iíll take a picture when possible.
Based on this, if I figure out what the otpos are doing, and which of the 3 wires are 5v can I remove the entire igniter? If this is correct, what do I do with that 5v line?
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Old 25th March 2008, 08:29 AM   #67
atoz is offline atoz  United States
diyAudio Member
Join Date: Mar 2008
Okay so I got impatient and went for it. Probubly not the smartest thing, but it worked. I made a jumper cable and connected the ground and +5v going into the mainboard. Projector came on as expected, now its time to find a suitable lamp.
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Old 2nd May 2008, 10:01 PM   #68
SuperDre is offline SuperDre  Netherlands
diyAudio Member
Join Date: Aug 2007
Well, maybe a new player in town with a good replacement (only the size of the bugger would be a problem for most beamers I guess (17.3cm x 13.5cm x 9.1cm):


It's already being used in Panasonic RPTV's.. I just haven't been able to find a price for the unit..
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Old 18th December 2009, 02:29 AM   #69
mattystar is offline mattystar  Canada
diyAudio Member
Join Date: Dec 2009
Hey, I bought a Philips LC4431 Projector. I need to bypass the light check, and I need some recommendations for lights and reflectors. I tried a 25w slideshopw light which is barely visable (My projector will show an image until 3 checks then shuts off). Also I got an xenon 80watt 12v automotive light which did better but the reflector I used melted under the heat because it was plastic. I don't have much money and I really want this to work.
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Old 21st December 2009, 11:43 PM   #70
Gizmotech is offline Gizmotech  England
diyAudio Member
Join Date: Mar 2005
To keep the projector on, you need to find he optocouplers and short it. The optocoupler is generally a retangular tiny black component with 4 legs (2 on each side). Some have more than one. Alternatively, look at some of the bypass guides written by CrazyFunGuy.
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