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Dell Latitude C540/C640

Hello.. I recently received a Dell Latitude C540/640 PP01L Laptop which won't power on with a adapter nor a charged battery. Considered the motherboard as the culprit after a number of troubleshooting attempts.. Upon disassembly & close inspection of the motherboard's power circuit it seems the motherboard has been altered/tampered with.. on the left of the processor socket there are 8 Fairchild (FDS) Mosfets.. out of the 8 there are 4 FDS6694 30V DC Converter Powertrench Mosfets that are connected/soldered together via a resistor.. one resistor attached to 2 Mosfets (2 resistors used for 4) Don't really know what purpose this trick was used for, may be the company it went to previously messed up just cause the customer who happens to be a close relative won't pay them as much as they wanted? anyway, i did manage to remove the unwanted resistors & tried to see if the laptop works without, but it doesn't.. so im assuming i'm dealing with some shorted mosfets needing replacement? what else do i need to look for to get this not so fortunate critter to live again?

Thanks :-)


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Wow Buddy. I'm impressed with your work here.
I have seen many boards which were oem, which had what appeared to be 'add on' circuitry. It's common when a problem arises in a product, which they've already had a million of manufactured. Otherwise, maybe the NSA, CIA, or MA Bell doing a little snooping?
Ok just kidding.
Assuming the circuitry which was replaced was still there, I've experienced a couple of "no power" issues on these models.
Bad power board.
AC adapter socket unsoldered from board.
Dead short between motherboard and palmrest/case.
Bad memory.
Burned capacitors.
Best thing since it's apart already, just order another board and you'r good to go.
I sell the same board at my shop for 75-100.00 US.
If the processor's good, then you should be good to go.
Good luck

Posted on Jan 23, 2008

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Geekman
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SOURCE: Dell Latitude C540/C640

I think you are wasting a lot of effort, I know how you feel and sometimes you cannot win.
Junk it for parts.

I do volunteer work for Technical Aid For the Disabled (a charity organisation) and repair/refurbish laptops and computers for disabled people and I hate to see good computers go to waste.

Posted on Nov 16, 2008

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