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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Re: NEC LCD1912 LCD monitor, no power
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.
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The power surge probably blew the fuse inside the tv, first check the fuse inside the mains plug, if that is good then you will have to take the back cover off the tv, you are looking for the power board follow the mains cable into the tv and you will find it. Look for a fuse on the board, pop it out of the fuse holder, if you have or can get hold of a multimetre check the fuse for continuity if it hasnt you will have get hold off another fuse, you can normally get them from your local electrical repair shop, they dont cost much and the liklyhood is they will probably give you one free of charge.
The issue might be that your monitor is not getting enough voltage to turn on properly.
If the monitor is plugged into a surge protector, remove it and plug it directly into the wall outlet. If the monitor works fine, the surge protector is not allowing enough power thru it for the monitor to work correctly - replace the power strip.
If there is no change, then your monitor is going out.
You should have turned off your monitor,it being on al the time has burned something out. Cheaply made electronics will eventually over heat and fail. even brand name computer products have been using cheap defective capacitoris from China, which result in whole product lines failing.
Is this a no name monitor or a brand name?
Check if it is under warranty or buy sn inexpensiver replacement. Repairs will cost you as much as a new one.
Disconnect and reconnect both ends of the video cable (while the computer and monitor are both off). Also disconnect and reconnect the power cable. Is the power cable plugged into the same surge protector as the computer? And also try a different outlet on the surge protector for the monitor.
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.