Question about Mitsubishi Diamond Plus 100E Monitor

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Mitsubishi diamond pro says "no signal"?

Help, i got a diamond pro monitor which gives me the No Signal message.

The monitor does power up, so its not the power supply.
when i plug a computer into the vga connector, i dont get the signal, just the same box floating around saying no signal. Also if i press the menu button in the front of the monitor, i get no response to it.

any advice, help, tips & tricks are most welcome.

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  • 3 more comments 
  • j.oed Mar 02, 2009

    yes, i have tried it on 2 different machines, both machines work fine with other monitors.
    About the cable you speak of, is it inside the chassis ? i have not opened her up (yet). Although now after your reply, you give me new hope :) thx, i will try to check this in the next days.
    Also if you can outline a few more possibilities for me to try out, will help a lot since the monitor is at a friends & in one go i can go to her & try a whole lot of things.
    So, in this situation if the cable/connector is connected internally & seems fine, what could be the next fault ?

    Most appreciate your feedback, looking forward to more :)

    Thanks & regards.

  • j.oed Mar 02, 2009

    its the mitsubishi diamond pro 2040u

    thanks for all your suggestions rob, i will check them in the next days & let you know the feedback & results.

    you have been a great help already, thanks again, i really would like to get this baby working again.


  • j.oed Mar 05, 2009

    hi Rob, well, now i have bought the box over to my place, opened up the main plastic chassis & took out a few of the metal plates inside, so far all seems well & i dont see any blown out looking parts, i still have to take out a few more boards though, so i will keep you updated on this.

    Now, about the status of the monitor, when i power on with a working source computer connected, the light comes on green & the osd displays "No
    Signal", then in a few seconds the light turns amber & displays "Power Save".

    There are about 4 different boards in the machine, which should i try to examine to pinpoint this problem?

    Yes, there is a black cable from the vga board going upto the Video PCB & it seems fine. I dont really see any bloated capacitors or burnt resistors etc (as of now, like i said i do need to open up more), I look forward to your assistance with this.
    Much appreciation for your time & guidance.
    sincere regards

  • j.oed Mar 05, 2009

    ps. is there a way i can send you photos of the boards, so that you may better analyze & tell me if something looks amiss? let me know, thanks.

  • j.oed Mar 05, 2009

    wow .thats amazing, i was reading through the other posts on the fixya & well this seems to be a very common situation with many different monitors & is probably something i will be able to fix without intensely expensive costs, nice to know :)
    i will start to diagnose the problem in the next days, in this time if there is anyone out there with a clear picture of what to do with this particular model of monitor (Mitsubishi Diamond Pro 2040u), i would very much appreciate the support, thanks in advance.


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  • 463 Answers

You have tried the monitor on more than one known good computer, yes?

I believe about 4" inside this monitor in the back the vga cable or connector connects to a board with an in-line connector. Can you see if this connector (internal to the monitor) in connected?

Good luck...

Posted on Mar 02, 2009

  • Rob
    Rob Mar 02, 2009

    Yes, the cable is inside the chassis. It runs from the sub=15 vga connector affixed to the back of the unit (it may be wired straight though, though, depending on the model of mistsubishi) to a pcb in the back.

    Other thing to check is the power supply board... just look and see if anything looks unhappy like an overly fat capacitor or a resitor or diode that looks smoked.

    Best of luck,



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