I picked up a NEC LT150Z for £60 the other day off eBay, the seller claimed it didn't work so i took a risk and it seems to have paid off...
It seemed to power up fine but the bulb wouldn't light so i took it apart and removed the lamp module and ballast from the front.
After removing the lamp you can see the colour wheel...
I wanted to trick it into thinking the lamp was on so i could try and get an image without the original lamp. I took a look at the ballast module and found three opto-isolators right next to some wires going to one of the main PCBs. This looked suspiciously like a little check to let the projector know the bulb was on so i looked up the chip specification. Once I new how it worked it was easy to figure out the logic. The middle chip turned out to be an output, and the chips either side were inputs from the main board. I figured the middle chip was responsible for the check so I shorted out the isolator and powered it up.
All seemed good, the lamp warning didn't come on so i got out 'the worlds brightest unfinished bikelight' and pointed it down towards the DLP chip. 😀
And it actually worked, i got a decent picture, although it wasn't very bright as the lamp is only 35W!
Now all i need to do is get a really bright metal halide lamp and reflector, point it at the colour wheel and i should have an XGA DLP projector for about £100! Not only only is it loads smaller than my original but it should have way better contrast and brightness, and should only take a day or so to make! :lol:
It seemed to power up fine but the bulb wouldn't light so i took it apart and removed the lamp module and ballast from the front.
An externally hosted image should be here but it was not working when we last tested it.
After removing the lamp you can see the colour wheel...
An externally hosted image should be here but it was not working when we last tested it.
I wanted to trick it into thinking the lamp was on so i could try and get an image without the original lamp. I took a look at the ballast module and found three opto-isolators right next to some wires going to one of the main PCBs. This looked suspiciously like a little check to let the projector know the bulb was on so i looked up the chip specification. Once I new how it worked it was easy to figure out the logic. The middle chip turned out to be an output, and the chips either side were inputs from the main board. I figured the middle chip was responsible for the check so I shorted out the isolator and powered it up.
An externally hosted image should be here but it was not working when we last tested it.
All seemed good, the lamp warning didn't come on so i got out 'the worlds brightest unfinished bikelight' and pointed it down towards the DLP chip. 😀
An externally hosted image should be here but it was not working when we last tested it.
And it actually worked, i got a decent picture, although it wasn't very bright as the lamp is only 35W!
An externally hosted image should be here but it was not working when we last tested it.
Now all i need to do is get a really bright metal halide lamp and reflector, point it at the colour wheel and i should have an XGA DLP projector for about £100! Not only only is it loads smaller than my original but it should have way better contrast and brightness, and should only take a day or so to make! :lol:
Hi !
your original lamp is 130W NSH, it is a DC super high-pressure mercury lamp, not a metal halide lamp,
I selling this DC bulb
come here:
http://www.diyaudio.com/forums/showthread.php?s=&postid=1099869#post1099869
your original lamp is 130W NSH, it is a DC super high-pressure mercury lamp, not a metal halide lamp,
I selling this DC bulb
come here:
http://www.diyaudio.com/forums/showthread.php?s=&postid=1099869#post1099869
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An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Thanks ywh, but i suspect the ballast has failed and not the bulb, i haven't had a chance to fault find yet but since the bulb is almost brand new i'm fairly sure.
I'm seriously intersted in some your parts though, i will be in touch shortly.
I'm seriously intersted in some your parts though, i will be in touch shortly.
Hi !
I have many ballast, like NSH,
but I can not open your pics, because the earthquake, can you send the pics to me? yuweihua@163.net
I have many ballast, like NSH,
but I can not open your pics, because the earthquake, can you send the pics to me? yuweihua@163.net
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