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Nec VERSA M500 Laptop - Main power defects on mobo

Hi, this laptop runs well with battery but not with main power supply. The power block is OK but on mobo no led, no fan, no battery charge, nothing... I've 19V behind jack connector but not after the first component beside connector : it looks like grilled resistor, but not sure... referenced PF501 on mobo, maybe a fuse (why "P"...?) but often wide green component (not here...).
0V continuity is OK everywhere on mobo from jack.
What's this component ? and characteristics ? may other ones be damaged ?
Thanks for your help...

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Re: Nec VERSA M500 Laptop - Main power defects on mobo

Hi There.

Measure your AC-Connector using multimeter while the ac adapter is connected to the motherboard you should read exactly same as your AC-adapter if you are reading low value your motherboard is shorted if you are reading same value in ground to ground you have connector problem replace the connector. if motherboard short find the faulty parts and replace.



Posted on Jan 28, 2008

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Re: Nec VERSA M500 Laptop - Main power defects on mobo

You are going to think this is a fairy tale, just like I did, when I heard of these. It is a "polarized fuse". From the best I can grasp the component, it is a cross between a diode and a fuse. Because you have a device that has potential DC power source originating in two different locations (battery and PSU), a PF is often deployed to protect each circuit separately from overload/shorting. With a PF, the laptop can theoretically survive a overload from either source while both are utilized simultaneously. For instance, the PSU might pop its PF, and if the battery is charged, the laptop can still continue. And it is really critical to replace it with the same polarized fuse, with the same exact rating. That will NOT be easy. They are rare, most semiconductor suppliers do not carry any or carry few variations. The manufacturer usually custom orders these. There is a possible alternative solution. But to be sure, I need to see a photo of the section of MB with this PF and its peripheral related components. I have a Versa, but it is a 2006 model. No PF. Take a clear shot and post it here. Then if I recognize it, I will get back to you.

Posted on Jan 27, 2008

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