Question about Optoma Projection Televisions

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My Optoma EP1690 projector stopped working one day (after the warrenty) and I need to figure out what happened (no flashing lights - no nothing, just dead). Is there fuse that may have blown due to a power surge? Is there a service guide available? I don't want to damage the case when I pull it off, and there seems to be something other than the screws holding it on. It's free at the front, but stuck about 2/3 of the way back.

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  • 4 more comments 
  • jamiefisher Oct 11, 2008

    I already had the regular user manual, but what I'm looking for is a SERVICE manual (with info on opening the unit and servicing it.) Once I get it open, I can look for a fuse, and trace the power with my multi-meter.

    I need to know if there is a fuse (and where it is), and how to open the case.

  • jamiefisher Oct 11, 2008

    I want to know if someone has specific experience working on this projector, or very similar. I got the case open while I was waiting (it was just stuck), but need to preceed with tracing the power...

  • jamiefisher Oct 11, 2008

    Do you think that you'll be able to help me find and test the power transformer, protective components, etc? My knowledge level is as follows: I'm comfortable assembling a PC from scratch (install CPU, Ram, boards... etc), and I'm wiring up my garage from scratch (60A 240V sub-panel, branch circuits, split sockets... etc), and I have been playing with solar panels and batteries (12V DC), but electronics fall in my grey area of experince.



    I have taken some photos of the insides of my projector. I will try to post them for you. Also, as I disconnect more components (because I cannot reach the power supply otherwise) will it even power up without the control board attached, etc? Will I even be able to identify if it has power, or will it be masked by the fact that there is no component telling it to power up? When it was working, and you connect the power cord, a standby light starts flashing, but that is on the cover which is the first thing I had to dis-connect (cover also had the switches, and IR receiver). Next thing I had to lift up was the control board (connects fairly similarly as a high end video card to a PC motherboard). That's where I'm at. The power supply is now partially accessible.

  • jamiefisher Oct 11, 2008

    Pic of power supply, beneath main board (probably just a custom video card)



  • jamiefisher Oct 11, 2008

    Projector top view and disconnected cover inside view



  • jamiefisher Oct 12, 2008

    Well, it seems as though the fuse is blown. It took me hours to take most of the projector apart to be able to get at the fuse and test it! Man, I'll never take for granted an accessible (and user replacable) fuse again! The power supply unit was burried in the bottom of the projector.




    It's a 5A, 250V fuse. I'll have to call some electronic supply stores and see if I can identify the correct fuse. Any idea how common it might be?




    I just hope I can find a replacement fuse, swap it out, and then get it all back together.




    And hopefully it's only the fuse that went. It would really **** to put it all back together and find that it still doesn't work.

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If its not a fuse it will need to be tested to see if the power transformer is sending out power, if it is then a protection transistor or other (protective component( pr) will need to be checked , besides that it could be the rectifier area , voltage regulator or following circuts

Posted on Oct 11, 2008

  • 1 more comment 
  • jason Oct 12, 2008

    do not apply power with connections not connected! you can dammage other parts of the circutry that will end up taking the extra power.

    By setting the meter to diode check and no power to the unit you can look for continuity starting with the red coil ,then there is a fuse of some sort, labled f and #'s followed or labled pr and #'s followed . if those have connection you will need to then check the transfomer for power output, plug in all connections on the unit ,or you can check the transformer outputs for continuity with the unit unplugged.

    Once you have got this far let me know the results and we will move to the next testing area if needed ( If checking for power set multimeter on 200V AC and check for power in and power out to the rectifiers( the rectifier converts ac power in to dc power out)(diodes)the colored line on the diode represents the negitive side of the component. You can check these also without power to see if they are good if you reverse the leads on it and it is an open it is OK. forward measurements should read about 7 on the DMM

  • jason Oct 12, 2008

    usually the fuse don't go unless there is a problem , but if there was a power surge that could have done it, if the fuse goes again there is definately another problem and you will have to start checking and looking for a cause

  • jason Oct 16, 2008

    need any more help?

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Just use this below link ....ur product manual is available in pdf format

http://www.projectorcentral.com/Optoma-EP1690.htm

Posted on Oct 11, 2008

  • 3 more comments 
  • mohammed marika thambi
    mohammed marika thambi Oct 11, 2008

    there is no flash light means it may also be fuse problem.....so check out the fuse tooo....if the fuse is not blown means..the problem night be in supply that the voltage was not able to fall on the pcb...so watr am suggesting is..if ur familiar with electronic component means u clear ur fault by ur own else give it to authorised service center...any more doubt pls ask me...i will assist u..
    thank u


  • mohammed marika thambi
    mohammed marika thambi Oct 11, 2008
  • mohammed marika thambi
    mohammed marika thambi Oct 11, 2008

    just try this...i think the fuse may not be a problem..This replacement lamp refreshes your projector and can add years to
    your usage with the proper projector care. Projector lamps wear down
    with each use just like light bulbs in your overhead lighting or table
    lamps at home. After a few thousand hours of use, the lamp might become
    too dim or eventually stop working. Purchase this replacement and
    you'll be up and running again as bright as the first time you used
    your projector.


  • mohammed marika thambi
    mohammed marika thambi Oct 11, 2008

    Customer Service: 1-877-722-8948



  • mohammed marika thambi
    mohammed marika thambi Oct 13, 2008

    if u find fault in fuse ...replace that...



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