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No power on NEC LCD1912 LCD monitor

Hello,

We have an NEC LCD1912 LCD monitor. After a power surge, there was no power to it. I took it first to a guy down the street (professional) who fixes computers. He checked the resistors and caps on the power supply board, but said they checked okay. The slo-blow fuse is okay too.

I then took it to a more knowledgeable guy a few miles away. He checked the power board, it is okay. The VGA/video board, which has the Genesis SMD chip on it, is the problem. He checked about 20-25 SMD caps on the board and they are all good. He said the chip is bad. He said that it is not worth repair. Does anyone know who sells the VGA/video board for the LCD 1912 monitor? I would really like to get this thing working, or at worse case sell the power/inverter board and LCD screen for parts.

Any help appreciated

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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.

Posted on Feb 23, 2008

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