Has anyone fooled with an LP220? i like the picture on it, i picked up one at the local thrift store wiht a bad fuse. still had a lamp in it, but its nearly exausted. the quartz is gray, with white stripes running in it from decentigrated tungsten electrodes.
the lamp still lights and works fine, but the picture is VERY dark and the lamp wont run for very long before it goes into standby.
anyone done any retrofits?
the lamp still lights and works fine, but the picture is VERY dark and the lamp wont run for very long before it goes into standby.
anyone done any retrofits?
Take it apart, find the ballast and then looks for a couple of wires going to one of the main boards.
Since the ballast will always be isolated from the main boards these shouldn't be hard to find. The only other wire goin into the ballast will be a power supply. This may be direct from the mains or a rectified DC source from another power board.
Once you find these wires you should look at the circuit board on the ballast for some opto-isolators. These are essentially LED / photo-resistor pairs built into a package and will be right next to the wires. You'll need to look up the spec. on google and figure out what they're doing. An LED will be input so the wires to the main board you want to short will be connected to the photo-resistor on the opto-isolator. This should trick the main board into turning on.
Don't do this if you're not confident, and make sure you do it with the mains unplugged and discharge any caps or you'll have a nasty shock..
Hope this helps,
Doug
Since the ballast will always be isolated from the main boards these shouldn't be hard to find. The only other wire goin into the ballast will be a power supply. This may be direct from the mains or a rectified DC source from another power board.
Once you find these wires you should look at the circuit board on the ballast for some opto-isolators. These are essentially LED / photo-resistor pairs built into a package and will be right next to the wires. You'll need to look up the spec. on google and figure out what they're doing. An LED will be input so the wires to the main board you want to short will be connected to the photo-resistor on the opto-isolator. This should trick the main board into turning on.
Don't do this if you're not confident, and make sure you do it with the mains unplugged and discharge any caps or you'll have a nasty shock..
Hope this helps,
Doug
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