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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