Question about Mitsubishi Diamond Pro 900U 19" CRT Monitor

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High Voltage About every 5 minutes or sooner, I hear a tic or multiple tics and the screen size increases on each and returns to normal. I believe the high voltage is arching out due to over voltage. Cooling and normal humidity does not have an effect. I think I am ready for a LCD. Chuck

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Hello.Ihave a princeton vl1919 monitor.The problem is when you press the power button the light comes on for about a few seconds then goes out then you hear a tic tic ticing noise can i try and replace the...

Try looking for bad caps first, see example of failed PRINCETON monitors because of bad caps here:
Post back what you see so we can guide you further.
The ticking sound is from power supply turning on and off.

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Check for other problems. You might need to buy another FET as well. But this time don't put the FET back in until you make sure nothing can blow it.

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Monitor is enlarged, wont return to normal size

You may have hit the "F11" key which takes the open window to fullscreen. "F11" toggles large, small... If not that, beboot. If that doesn't clear it up, then the display settings have gotten altered. Right click on the desktop, select "settings" and increase the resolution. Windows should prompt you to keep or reject the change. Select yes or no when prompted.

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Try change the keyboard, if the pc does not detect the keyboard or a key from the key board is stuck which gives something like tic tic sound. On the other hand the display from monitor "sleeping mode" indicates the VGA cord is faulty or monitor is no compatible to the PC's video card.

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Right I got my formac monitor open by removing the Bezel, it's tricky but not too hard. The casing is suprisingly flexible and forgiving. The clips are backed by a double sided tape on all four edges. Start from the top and give the tape time under tension to come unstuck, it will, a bit like a plaster.
Oh yes, unplug before continuing.
Inside there are four HEX #4 (5/64 inch) screws holding the display inside the chassis. These can be removed, on the back side of the panel is the power/controller board. And remaining in the chassis is the Cold Cathode power board (long thin one on one side). This can be unplugged to get more range on the cables. (remember which way it goes in, I use a marker pen over the plug and socket to show me where to put it back) The Controller board has a number of power components. Firstly there are 5 power diodes, they all seem to respond properly under a meter in my screen. There remains one linear voltage regulator LT1117 and two 500Khz Step down switch mode regulators, LT1374. These devices are most suspect for causing the over current draw. Replace them if you can do this with ease. However most regulators have inbuilt protection. So it is also possible that a support component such as a resistor or capacitor has failed causing the other components to operate outside of their intended parameters. I will post some pics of the board later.

Dr Matt

Feb 24, 2008 | Formac Gallery 1740 Oxygen 17.4" LCD...

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