Tricking an Infocus LP-340B Projector into thinking there is a bulb installed? - HotUKDeals
We use cookie files to improve site functionality and personalisation. By continuing to use HUKD, you accept our cookie and privacy policy.
Get the HUKD app free at Google Play

Search Error

An error occurred when searching, please try again!

Login / Sign UpSubmit

Tricking an Infocus LP-340B Projector into thinking there is a bulb installed?

timothyw9 Avatar
6y, 9m agoPosted 6 years, 9 months ago
Hia there,

I have an InFocus LP-340B projector which has no bulb and I do not plan on buying a new bulb.

My question is, does anybody know how trick it into thinking there is a bulb plugged in, so that a bulb could be DIY'ed in... - basically so that the projector will power up and display the Infocus logo with the help of a light source.

Also the bulb plugs in via a 2 pin connector thing.....

Tim
Tags:
timothyw9 Avatar
6y, 9m agoPosted 6 years, 9 months ago
Options

All Comments

(21) Jump to unreadPost a comment
Comments/page:
banned#1
The trick is.....
buy a bulb
banned#2
it seems projector bulbs are the new inkjet ink

made to be as awkward and expensive as possible
#3
ryman1000
The trick is.....
buy a bulb


At the price of a bulb and for a projector of this age there would really be no point.

As it is relitevly old I would think the method of bulb detection would be relitively simple?

Tim
#4
timothyw9
At the price of a bulb and for a projector of this age there would really be no point.

As it is relitevly old I would think the method of bulb detection would be relitively simple?

Tim


If you tell us why you want to do this, it may help us answer it a bit better?
banned#5
I think he would gain by using a cheaper bulb behind it!

of course it will never be as good as, but perhaps he doesnt want to spend 100 quid plus for a bulb
#6
aircanman
If you tell us why you want to do this, it may help us answer it a bit better?


So that I could fit a cheaper halogen. (MR16 bulbs seem to be used on this : http://jjdogg.wordpress.com/2009/12/11/broken-projector-modfix/)

If I can get a projector to at least project an image , in Pitch black if needed (velux windows with blackout blinds) It d be cool.....
Tim
#7
dcx_badass
What would you gain from this?


A working projector!:thumbsup: hehe
#8
timothyw9
So that I could fit a cheaper halogen. (MR16 bulbs seem to be used on this : http://jjdogg.wordpress.com/2009/12/11/broken-projector-modfix/)

If I can get a projector to at least project an image , in Pitch black if needed (velux windows with blackout blinds) It d be cool.....
Tim


Ah right ok. Projectors use a discharge lamp, which needs quite a lot of power to ignite first off, I dont think this is recommended IMHO - It may be worth buying a bulb, I know alot of people think the bulbs are very expensive, but if you buy a good quality one, it should last you a long while.
#9
jubbyme
I think he would gain by using a cheaper bulb behind it!

of course it will never be as good as, but perhaps he doesnt want to spend 100 quid plus for a bulb


Pretty much yeah.
#10
timothyw9
Pretty much yeah.


After having a little look at what you would need to do, is it really worth it?

You need to find out where the power circuit is that tricks the unit into thinking there is a bulb in it, you then need to use a ELC standard bulb in it, with a possible custom mount for the bulb, with a seperate 12V power supply to power the bulb, because the psu in the projector will probably blow it up straight away.

All for a sub standard quality picture? Surely you can get a bulb for around £75?
#11
aircanman
After having a little look at what you would need to do, is it really worth it?

You need to find out where the power circuit is that tricks the unit into thinking there is a bulb in it, you then need to use a ELC standard bulb in it, with a possible custom mount for the bulb, with a seperate 12V power supply to power the bulb, because the psu in the projector will probably blow it up straight away.

All for a sub standard quality picture? Surely you can get a bulb for around £75?


Seems to be about £200 cheapest - http://www.filron.com/uk/index.php?act=viewProd&productId=241888

Which I wouldnt call cheap....

If I could use a MR16 Halogen bulb, powering it would be as easy as using a computer power supply (via the molex connector).

The problem in the way though is trying to figure out what causes the projector to display the splash screen. (aka. makes the bulb known to be present.)
#12
timothyw9
Seems to be about £200 cheapest - http://www.filron.com/uk/index.php?act=viewProd&productId=241888

Which I wouldnt call cheap....


Bloomin hell that is not cheap lol, still, I would say its better than the other way!!

I am sure u can buy a projector for that much!
banned#13
yep, 190 quid plus :?

did edison hand make it or something?
#14
jubbyme
yep, 190 quid plus :?

did edison hand make it or something?


These are the same style bulbs in the super white light car headlights, they cost an absolute fortune to replace, because of the power they need to light, I am not 100% up on them, but they have a gap filament, which basically acts like lightning going from one end of it to the other, cost alot more to make!
#15
jubbyme
yep, 190 quid plus :?

did edison hand make it or something?


He did.....

I can see why projector bulbs are expensive (the way they have to be produced, the accuracy etc to keep it all safe and offer highest performance., even though it can be a pain.
#16
bumpey
#17
If there's a bulb checking circuit in place, what it'll probably check for is that the circuit is closed (ie, there's a bulb in the middle of it, so those likkle electrons can make the round trip), and that the resistance is correct. Stick a suitably resistive resistor in where the bulb should be, and the circuit should be none the wiser.

How you find the correct resistance of a live bulb, I don't know. Googling for specs might work, as might an email to the manufacturer, or a multimeter on a fully-working second unit. Good luck.


Edit: Oh, and be careful with it. Electricity can really hurt.
#18
dxx
If there's a bulb checking circuit in place, what it'll probably check for is that the circuit is closed (ie, there's a bulb in the middle of it, so those likkle electrons can make the round trip), and that the resistance is correct. Stick a suitably resistive resistor in where the bulb should be, and the circuit should be none the wiser.

How you find the correct resistance of a live bulb, I don't know. Googling for specs might work, as might an email to the manufacturer, or a multimeter on a fully-working second unit. Good luck.


Edit: Oh, and be careful with it. Electricity can really hurt.


Thanks for the help, makes sense, either that or it requires certain wires to be shorted/grounded/something to trigger it to think the lamp is connected.....to be frank itd help if they if they didnt use stupid torx screws.., that would make getting to the ballast a helluva lot easier so that i can see the circuitry - as i currently cant get to to it because i dont have the right size..

I can see being shocked by a ballast hurting a helluva lot more than a 12v power supply (Having shocked myself a couple of times on a PS2 or XBOX modding)


Thanks,
Tim
#19
Having succesfully gotten to the ballast/power supply, I am now stuck finding out how to bypass it.

This guide seems to be the answer: http://www.diyaudio.com/forums/diy-projectors/141537-commercial-projector-ballast-bypass-guide.html

I assume it is talking about the two wires that connect to the bulb... my problem being of course I dont possess a multi-meter. Is there any other way of finding 3v? (Or assumably 3.3v ish as thats one of the voltages the ballast / psu sticker has on it.) I dont want to go frying the thing for the sake of a 50/50 chance...

Tim
#20
Just for general working out information, the sticker specifies this:

INFOCUS 510-1486-25
Magnatek Model 3979-03-100
Input 100-120V/230V ~ 4.5/1.8A
Output 75VDC @3.6A, 12VDC @ 1A,
5VDC @ 1.5A, 3.3V @ 3A, -8.5V @ 0.25A

I assume the 75V output power is either what strikes the bulb or what the bulb runs at.


Tim
#21

Post a Comment

You don't need an account to leave a comment. Just enter your email address. We'll keep it private.

...OR log in with your social account

...OR comment using your social account

Thanks for your comment! Keep it up!
We just need to have a quick look and it will be live soon.
The community is happy to hear your opinion! Keep contributing!