Question about NEC MobilePro 790 Pocket PC

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NEC MobilePro 790 Battery Problem

I just got a 790 off ebay and the device behaves like there's no battery connected. I've tried three different batteries, I've tried cycling the batteries, charging, draining, all that. But the device always behaves the same way. It won't power up unless it's plugged into the wall. Then the LED turns green. I understand it's supposed to turn amber when it's charging a battery, but it doesn't. It's either green when it's plugged in, or it's off when it's not. The power menu in the control panel always says that the main battery is at 10%, even if there isn't a battery connected to the machine at all! Thanks for any help!

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  • peejayeitch Oct 29, 2008

    I also am havnig the same problems with my MobilePro 790, pettystrife. I have been using it 'normally' for years, and suddenly one day, it stopped charging. When I contacted the guy who sold it to me second hand (he deals with them quite a bit), he said it sounded like a motherboard problem - if I replaced the motherboard, it should fix the problem. He sold me a broken unit that still had the motherboard intact, and I replaced my old motherboard, and voila! It worked! I enjoyed 2-3 weeks of true mobile document creation etc., and just this week, it has started again! NOOOO!!! Now I don't know what to do.



    I have a theory though...there are some situations where I use it and leave it plugged into the wall to charge as I use it, even though the battery was already full when I started. I am wondering if using the unit while it is still plugged in is actually overloading the motherboard somehow, effectively reversing what should be happening, and causing damage to the unit in the process? The reason why I am thinking this is the problem only happened again when I had the unit back in that same situation where I was using it from full charge whilst still plugged into the wall. I know it sounds weird, but it's the only thing I can think of, as it seems to be the only variable that was replicated to recreate the problem.



    I don't really understand how the charging mechanisms work at all, so what I said probably makes no real sense, but this has been my experience with the same problem as you seem to be having (green LED or bust, no charge in between etc.) Maybe if you were to replace your motherboard on your unit, and see if that fixes the problem to start with, and then not use it whilst charging, but charge the battery only when it's turned off? If you do that and it works, let me know! 'Cause I don't want to fork out for yet another motherboard only for it to go belly-up too.



    Cheers,



    Jamie.

    peejayeitch@aapt.net.au

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SOURCE: Nec MobilePro 790 Handheld pc.

I don't believe that I've seen that..how did you 'send' that information?

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SOURCE: Using AA batteries in nec mobilepro 790

no absolutely not! i have not read that any were but if it was possible what you would have to do would be semi dangerous (for you and the device). if you want to take the chance then remove the battery (don't open the battery it self) then there should be some gold conecters that are on the battery and the nec there should be at least 2 conect the batterys to eachother and then to the conecters and hopefuly it will work (this is realy not that easy but you can try)

Posted on May 16, 2008

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