Question about Mitsubishi Diamond Plus 73 17" CRT Monitor

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Mitsubishi monitor is distorting the picture

I have a mitsubishi Diamon plus 73. About 5-6 years old Last night when i turned it on the image on the screen was shrunk. Although the width was approximately the same ( albeit bulging down the sides) its height had shrunk from both the upper and lower edges. another way to describe this is that it almost appeared wide screen with large black bars at the top and the bottom. None of the image was lost it was just squashed into this space i was considering opening up the case myself to have a look for a loose wire or something. I hav efound that if i place my hand on top of the monitor and wiggle the screen returns to normal. I have tried wiggle the 2 cables at the back of the monitor but they dont really seem to be the cause. So perhaps there is a component situated above the tube and between the case? Any tips on what to look for? PLus any tips on how to open the case as there dont appear to be any screws? amd i dont want to damage it. Thanks

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  • KINGSWORTH75 Sep 15, 2007

    Hi thanks a lot for the help.

    i have removed the cover from the monitor. how do i go about identifying the parts you talked about?

    perhaps you know of an image which would explain which part was which?

  • KINGSWORTH75 Sep 15, 2007

    I found a manual for another Mitsubishi monitor over at

    I have attached some images that i have cropped from that. although it is not the same monitor, is the part your on about inside the thing i have ringed in red?

  • KINGSWORTH75 Sep 15, 2007

    Also what does IC stand for in vertical IC?

    What are the shields?

    Im sure i can do this i just need some guidance.

  • KINGSWORTH75 Sep 18, 2007

    Hello there and thank you for your help.

    I have a concern about stored electricity in the monitor.

    I you watch this video

    it shows you how to discharge the electricty. However, if you watch you will see he connects one end of the wire to screw driver and the other end to another part of the monitor. Will this work? i am not good at electronics but wouldnt this just leave all the electricity in the monitor. The monitor is not plugged in so where does the discharge go? if this is reasonably safe please let me know.

  • KINGSWORTH75 Sep 18, 2007

    also having trouble finding the tsib.... im sure it should be on the larger mainboard, but cant see it at the mo and dont want to fiddle too much until the monitor is discharged. Is this where i should find it?



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Well first af all ,you never find this "loose wire" because it is a mith. what you have is a "cold solder" in the vertical IC, if you have a solder iron , and the ability to open it (without scratching), and then take off all the shields (without cutting your fingers), and get the solder area (without breaking the Tube). at this time ,it take you 1 minute to solve...!!! iF not... leave it to the repairman!!!.

Posted on Sep 15, 2007

  • kbza loka Sep 15, 2007

    i correct myself, loose wire = myth

  • kbza loka Sep 16, 2007

    ok, you are on the way, the part you marked is CRTBoard, there you must go if you have problems with red,green,blue or bright problem !!! not your case.
    the "shields" are all the metal parts that are around the tube, mainboard,CRTBoard,etc.
    ok, the ic you are looking for is the one that
    in schema you refer is TDA4867 ,a 9 pin (not 32 as you read in this manual).

    in your monitor, maybe, TDA4860 to 67, or tda9302 or tda8172, find it and resolder.
    Remember unplug it and wait a few seconds to discharge caps.

    As you told "i place my hand on top of the monitor and wiggle the screen returns to normal"
    you have fix it.!!



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