Question about InFocus SP-LAMP-017 Projector Lamp for LP540, LP640, C16

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I have no power when I power on the power buttom. There is no sign of life (Fan, LED Display, noise or nothing). It is as though it is not plugged in or turned on. I ripped it apart to see if there was a fuse blown. There is a fuse inside, but it was good. Can you give me some suggestions? Thanks Sam

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This problem is quite common in the LP640 and the LP540.
I have repaired about 75 of them with this symptom and every one had the same solution.

There are 2 power supplies in the projector. the issue is with the one right the rear panel. If you have moderate electro mechanical skills you can repair it. You will need to remove the power supply to perform this repair. You will also need a good temp regulated soldering iron (and know how to use it well) You will also need an OHM meter. You will find 4 surface mount diodes near one end of the power supply board. these diodes are approximately 3mm X 5mm and black in color. One of these is shorted!! use the ohm meter to measure each one. the shorted one will measure very differently than the other three. one of them will be less than 10ohms. you can buy a replacement diode from DIGI-KEY if you call them you can give them the part # on the bad diode and they can supply you with the same part or an equivalent substitute.
You will need to remove the top board and the screws on the rear of the projector (even the ones on each side of the "D" connectors)
The flexi cables that connect the LCD's to the main board as well as the 3 connectors they fit into are very delicate! Again if you don't know what you are doing you can cause much damage and possibly total the projector. anyway the LCD flexi cable connectors have a very small brown piece that runs the length of the connector opposite from the side the flexi cable is fitted into. This brown plastic pieces are part of the clamping mechanism that holds the cable in. to release the flexi cable the brown plastic piece hinges up toward the flexi cable releasing it. This brown part moves easily so do not force it! anyway if all this is above your skill level have someone else who is qualified do it. You do not need a new power supply! the Diode is about $0.78 and a power supply is closer to $150

Good Luck!

Posted on Dec 11, 2009

Testimonial: "Thanks for the great feedback and followup. I will try this."

  • igams Jan 02, 2011

    This solution worked for me!
    Official service repair wanted to sent the projector to Netherland - obviously there is a central InFocus repair station for Europe. The estimated cost of repair was 400,00 EUR!
    I followed the solution and really find out the shorted diode. It was VS-30BQ100PBF SCHOTTKY DIODE, I ordered it by Farnell and received it in a few days. It was 0,49 EUR for a piece. I also had to bought a better soldering iron, which was 40,00 EUR. The repair was fun and full of adrenaline. I was rewarded at teh end with a tiny green LED that confirmed my success. Thanks, sagertronics!


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Sir Sam your projector is deadset, try to open your projector, find thermal switch( if it have cause LCD projector has it) switch it. if problem occur? change power cord, and power supply board.

Posted on Oct 08, 2009


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