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NEC LCD1912 LCD monitor, no power

Hello,

I have an LCD1912 monitor, which just failed this weekend. It was not plugged into a surge protector, and power was briefly lost. When power came on, the monitor did not.

This unit is out of warranty. I know that NEC/Mitsubishi or a 3rd party depot can repair it, but I was wondering if anyone has successfully repaired this unit before. It is a couple components (possibly transistors) on the power supply side of the unit.


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More than likely, the power surge burned one of the small resistors on the power supply or secondary side of power out put card. This is not a hard repair to diagnose or to make but you will not want a novice to do it as you can do more harm than good if you are not qualified with a soldering iron and multitester.
Better to take in for repairs, should not be that expensive from what you haev posted here to fix it.

Posted on Feb 05, 2008

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If this has been useful please leave positive feedback/vote/testimonial as this will help me greatly - Thank You again

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I like the idea of reusing the old thing as much as anyone; if you can find the make and version of the working components, you're welcome to use them in native mode (no need for the control/interfaces chip; a PIC or other microcontroller can be substituted), make a projector, use the supply and other functions with their control lines 'tied low' with 200 ohm resistors, etc. I would be inclined to think that the video amps and detection circuits at the inputs failed (in hopes of saving the interior components,) and just replace those after I had some success driving the test points to force it into an ON state; but a positive ID of a bad chip is not going to put high hopes on that fix. A fixable unit would usually start to come on, then trip off when a failed functional section (or absence of video) was detected by a working control circuit.

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