Question about Dell (04U621) for Latitude D600, Inspiron 600M Motherboard

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Motherboard Dead Hello I have a Dell Latitude D500 Laptop. It had no power when plugged into the ac cord. I took it down to the motherboard and discocvered a couple of burnt out components, I believe they are called power inductors. The numbers on the components are 3R9 6R8 & H34. Can anyone tell me if there is a place I can find the description of all the components of the motherboard,. I would really like to fix but not sure how to proceed. Am mechanically inclined and can solder new components in. Any info would be greatly appreciated,. Thanks Tom Happy New Year!

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  • N-Gen Feb 25, 2008

    I have the albetron P4M800-775 series motherboard. It seems to be quite dead even if all components are connected. only indication of power is the power led burning and that's it, not even the CPU fan is running. It seems that nothing else is recieving power due to dead motherboard. I have tested the power supply and there's nothing wrong with it. All other coponents are in working state for they have been tested as well.

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Hi Tom,

there are plenty of basic component overviews in the D500 Service Manual, but I don't believe you're looking for that specifically. What you're looking for is a circuit board schematic, to see the exact paths.

Unfortunately, Dell uses a strictly proprietary wiring scheme, so you'd have to call them directly. Although personally, I'd advise against repairing the board yourself, even with your experience. I think It's quite obvious from the burnt out components you've found that the board was subject to abnormal voltage levels, most likely from a power surge. There's no telling what path the electricity took, and how many components it's damaged. replacing those two inductors (if they are, in fact inductors) could fix the problem, or it couldn't... it's hit or miss at best. It's for this reason that most techs just replace the board instead, soldering it only if the problem is a leaky capacitor or two.

Posted on Dec 31, 2007

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Tomk161, heres some information that may help you.
the firt two components are not coils. 3r9 is a 3.9 ohm resistor, 6r8 a 6.8 ohm resistor. at this point im not sure what you mean with the punctuation etc" AND SYMBOL? amp; h34". do you mean these components are located at grid h34 on the board, or is this another componet or two? the wattage of the resistors is most likely only 1/4 watt or less. infact if they are surface mount (flat soldered driectly to the board with no wire leads) they are probably 1/10 w or less and most any surface mount resistors of proper resistance will work, regardless of wattage. give me more information on any other components you dont recognize and i may be able to tell you from 50 years experience as an electronics tech what they are, eventhough ive never seen the board you speak of. -daag55

Posted on Nov 18, 2008

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Only solution I have ever found is googleing the chip numbers and looking for a supplier of these exact chips. As for soldering them it is not that hard and I have had some success with it. Might be better to pick up a used board on Ebay if they are not too expensive. Sorry I have never found any schematics on the internet for laptop mother boards.

Posted on Jan 01, 2008

Hi Tom,

there are plenty of basic component overviews in the D500 Service Manual, but I don't believe you're looking for that specifically. What you're looking for is a circuit board schematic, to see the exact paths.

Unfortunately, Dell uses a strictly proprietary wiring scheme, so you'd have to call them directly. Although personally, I'd advise against repairing the board yourself, even with your experience. I think It's quite obvious from the burnt out components you've found that the board was subject to abnormal voltage levels, most likely from a power surge. There's no telling what path the electricity took, and how many components it's damaged. replacing those two inductors (if they are, in fact inductors) could fix the problem, or it couldn't... it's hit or miss at best. It's for this reason that most techs just replace the board instead, soldering it only if the problem is a leaky capacitor or two.

Posted on Dec 31, 2007

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