LED Modding Sharp PG-MB60LX Projector

[Syryll]

I've enjoyed this trash-picked projector for about a year now with the bulb that came in it, but it finally blew. Being the lighting fanatic I am, I decided I'd try a 50w LED in place of the OEM bulb, but I need help figuring out what's what to fool the main board into thinking that there's a bulb present and lit.

I've found the factory service manual online, and found the Five wires leading to the ballast control, but I'm sort of lost in their labeling, and can't reach the ballast with the unit on to probe as the main board sits atop it and has connectors all around that must be connected for the only fault in the system to be the lamp (or so I assume).

Ballast Control:


Pins with respective wiring colors, Purple is White =)
Pin 1 - L-Lit C
Pin 2 - L-Lit E
Pin 3 - 5v
Pin 4 - Lamp-En
Pin 5 - Eco (I assume this pin is useless in my quest for modification)

Diagram of Ballast:


From this picture, I find that Lamp-En is what tells the ballast to ignite the bulb, so that leaves pins 1 and 2 to tell the main board that the bulb is lit, but I don't really know where to proceed from here. Would I jump pins 1, 2, and 3? 1 and 2 maybe?

Thanks guys!

[budm]

Re: LED Modding Sharp PG-MB60LX Projector

It looks like the LAMP_LITS are the feedback signals to tell if the lamp did startup or not. Need to find out if it is active HIGH or active LOW.

[Syryll]

Re: LED Modding Sharp PG-MB60LX Projector

L-Lit E reads GND, while L-Lit C reads 3.3v. There is no deviation from these readings throughout the start-up of the projector though, and the lamp light immediately starts flashing upon power up, so I'm not sure if I should take these readings as "lamp on." That being said, the ballast does attempt to ignite a bulb, even though there's not one installed. That crackling sound scares me to death