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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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Hi

Please try the monitor without the surge protector to ensure there are no isues with the protector

If the monitor comes on you know its the protector, if it still fails then i recommned the following

1) ensure the fuse in the plug is ok and not blown
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If after this all fails then for some reason something has blown in your monitor and you will need to book it in for further inspection

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

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The issue might be that your monitor is not getting enough voltage to turn on properly.

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I'm very sorry to hear about your unfortunate new's. I had the same problem in my own home maybe a week ago.

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* First check the power where the tv was plugged in. Is it a power strip or a surge protector ? Surge protectors typically have an on/off switch and a separate reset push button.

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NEC Repair Services of course, where he would order the replacement part; but given you can't use them without a Service Contract (four figures; yet useful for a repair shop with a corporate client with lots of NEC equipment) the diagnosis you got sounds reasonable. Find the NEC Authorized repair specialist in town with a bench fee you like, or go shopping!

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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