Question about Dell Latitude C640 Notebook

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Dell Latitude C540/C640

Hello.. I recently received a Dell Latitude C540/640 PP01L Laptop whichwon't power on with a adapter nor a charged battery. Considered themotherboard as the culprit after a number of troubleshooting attempts..Upon disassembly & close inspection of the motherboard's powercircuit it seems the motherboard has been altered/tampered with.. onthe left of the processor socket there are 8 Fairchild (FDS) Mosfets..out of the 8 there are 4 FDS6694 30V DC Converter Powertrench Mosfetsthat are connected/soldered together via a resistor.. one resistorattached to 2 Mosfets (2 resistors used for 4) Don't really know whatpurpose this trick was used for, may be the company it went topreviously messed up just cause the customer who happens to be a closerelative won't pay them as much as they wanted? anyway, i did manage toremove the unwanted resistors & tried to see if the laptop workswithout, but it doesn't.. so im assuming i'm dealing with some shortedmosfets needing replacement? what else do i need to look for to getthis not so fortunate critter to live again?

Thanks :-) bought new charger for dell latitude c640..only blinks wont come up...took battery out..nothing..took cd drive out nothing....how to fix?

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  • Dell Master
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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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Posted on Jan 02, 2017

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1 Answer

Is there a place for your sim card in the DELL LATITUDE PP01L C540/C640


there is no slot for a Sim card for the Dell C540/C640 latitude system models.

Mar 26, 2011 | Dell Computers & Internet

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I HAVE A DELL C540/C640 MODEL PP01L I WANT TO KNOW THAT IN THIS MODEL CAN I ACCESS WIFI OR NOT?


If you model has the optional wireless card installed.
To check, click Start - Control Panel - System - Hardware - Device Manager - expand Network Adapters and if the wireless card is not listed then you don't have a wireless card.
If there is a wireless card and it has a yellow ? against it then the wireless card driver was not installed. In this case -
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Hello. I have a Dell Latitude PP01L laptop. I am


Hi,

That's a hard one. Not all laptops provide that kind of information of date of manufacture.
If yours does then it will be printed on one of the stickers that are underneath the laptop.

If there are no dates on any of the stickers then you are stuck there.



Regards.

Jul 20, 2010 | Dell Latitude C640 Notebook

1 Answer

Need drivers for pci modem and video controller (vga compatitble)for dell latitude c540/640


The drivers for c540 and c640 are different.

C540 Drivers - http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=LAT_PNT_CEL_C540&os=WW1&osl=en&catid=&impid=

C640 Drivers - http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid=&SystemID=LAT_PNT_P4N_C640

May 07, 2009 | Dell Latitude C610 Notebook

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Dell Latitude c540/640


Windows Vista is not supported on Dell Latitude C540/C640. There are no drivers for the hardware of this model. Many older computers have that problem. You can try Microsoft to see if they even exist: http://www.microsoft.com/uk/windows/products/windowsvista/buyorupgrade/upgradeadvisor.mspx
You might have to fall back to XP.




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Thank You.

Oct 27, 2008 | Dell Latitude C640 Notebook

3 Answers

Dell Latitude C540/C640


ya u can try to chnag ethose how much is the mobo on ebay for one of these also new mobo may be your best bet even fixing them still may not work for u thats 50 50 chance

Jan 22, 2008 | Computers & Internet

1 Answer

Dell Latitude C540/C640


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

Jan 22, 2008 | Compaq Presario X6000 Notebook

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