Question about NEC VT460 Multimedia Projector

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NEC vt460 After opening the projecter i found the only visible damage was to what looked like a thermister on the power supply board but there were no values to be able to quote. Is it likely that replacing this will solve the problem or is it more likely that there is other damage.heres a screen shot of the component on the board. http://img393.imageshack.us/img393/9572/p1010005np2.jpg thanks in advance, mike

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It does in fact appear to be a thermistor and the TH1 board marking seems to confirm that.
What markings are on the component (it appears to be a power transistor of some kind) adjacent to it?

If we can find a standard part number for it and you own some kind of meter, perhaps we can either eliminate or identify it as the original culprit.

The failed thermistor is either acting as a temperature sensitive clamp to prevent lamp failure or regulates lamp intensity dependent on temperature.

Maybe an email to NEC would get you the value of it (TH1) since I suspect a schematic or parts list will be hard to acquire.

Posted on Jul 01, 2008

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My projector can't on


I assume you mean it has no power? This is fairly common with the NEC VT460,VT470,VT595. The power board/Power Supply has failed. I can usually repair or replace the power supply for $170
If you're familiar with electronics you can try checking the main power fuse by removing all the screws on the bottom of the projector & taking the cover off. The fuse is located just next to the ac plug. Test it using a continuity tester with long testing probes. If it's ok then the power board is bad & needs repair.
If it's bad replace with the same type fuse. You can bring the fuse to Radio Shack for identification or look on the power board next to the fuse holder for fuse amperage.
If you would like a repair please contact me at PRMHELP@EARTHLINK.NET
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It may be go to damage bulb,replace it buy new one,

Jan 04, 2010 | NEC VT460 Multimedia Projector

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No Sir, Main power supply has 2 portion, 1st is called primary and 2nd is called secondary. Primary power area is connected to ac oulet directly and secondry power area is isolated and source of power to projector circuits. Lamp power supply calls "Blast Power Supply" in projectors (Its very high voltage area). Please be careful while testing power supplies.

Jul 25, 2008 | NEC VT460 Multimedia Projector

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Thats ok, In my openion, projector has power supply problem. Please open it and check fuses in secondry power area. Atleast one fuse is open there.

Jul 25, 2008 | NEC VT460 Multimedia Projector

1 Answer

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Hi yaali

Try using a different cable.

If the problem however persists , then you will have to get the Mainboard either repaired or replaced.

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Hello

Pls Service the LCD Panels of the Projector, Also check the Fly-Eye lens, just next to Lamp unit. This will solve your problem. if it's not then the only solution is Replacement of LCD Panels, But Must check or replace the external RGB Cable first befor doing all this exercise.

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Hi,

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Nov 26, 2007 | NEC VT460 Multimedia Projector

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