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D600 interesting problem will not charge Battery ( this is different then most)

post #1 of 15
4/26/08 at 12:57pm
Thread Starter 
I have a very perplexing problem.

First the laptop is a Dell D600

The laptop about one month ago had the power jack smashed (cable was stepped on) someone plugged the cable back in, in doing so the main power pin (surrounding the center pin) was bent over so it now made contact with the (data) pin that tels the laptop what power supply is connected and if it is a genuine Dell.

This in turn shorted out the circuitry in the laptop that can read this 'data' line.

So no matter what power supply I use the laptop will always state that the wrong adapter is connected and will not charge. (strange also is the PCMCIA slot has no power. Everything thing else works.

What I have tried,

Tried my battery in another D600 (charged and ran no problem (my laptop would run from the battery but still no PCMCIA power.

Tried my charger on another D600 worked fine so the data pin is fine on it. Tried another charger on my laptop same problem.

I already fixed the power port.

Last I tried the laptop in a Docking station and same problem (wrong adapter type) This is fed through the bottom of the laptop not the power jack.

So this tells me the problem lies in the logic circuit on the main board.




Sooooo...

Is there a simply surface mount fuse that may have blown?
or am I looking at a bad IC.

Any help would be fantastic thanks!
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post #2 of 15
4/28/08 at 8:01am
Quote:
Originally Posted by DJDaudio View Post
..I already fixed the power port...
. meaning power jack to the mobo?
. how? replacing it?

cheers ...
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post #3 of 15
4/28/08 at 10:47am
Thread Starter 
Quote:
Originally Posted by qhn View Post
. meaning power jack to the mobo?
. how? replacing it?

cheers ...
Yup just replaced the jack,

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA:IT&ih=001
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post #4 of 15
4/28/08 at 4:08pm
when it was apart, did u notice any burnings in the area around it? might need some "cleaning" and retouching (solder)

cheers ...
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post #5 of 15
4/30/08 at 8:38am
Thread Starter 
That was the weird part everything looks fine.. hence my loss on what to do next. is there a Bios Hack that will allow me to charge my batt? that is all I really need.
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post #6 of 15
4/30/08 at 10:14am
meaning somthing in the direction of disabling ACPI? i m not sure that would help u out, if the power is not feeding to the batt connector

cheers ...
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post #7 of 15
5/1/08 at 8:25am
Thread Starter 
Quote:
Originally Posted by qhn View Post
meaning somthing in the direction of disabling ACPI? i m not sure that would help u out, if the power is not feeding to the batt connector

cheers ...
Correct,

I am sure there is a small transistor that will turn on, on off charging power to the Batt. I just need to find this and 'hot wire' it high so it is always on.
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post #8 of 15
5/1/08 at 11:30am
well, electrical inside the mobo is out of my league. U need a schematic of the wiring of this comp. Search the net first, u might get lucky. Or look for sites that sells service manuals pertaining to this. U might have to invest a few $$.

ok, time for more experts into this thread here - good luck. If u sort it out or have any new ideas, share with us

cheers ...
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post #9 of 15
5/1/08 at 12:10pm
I'd say it'd just be cheaper to get another motherboard. D600s are quite common, and motherboards on eBay go for probably less than what you'd pay for the neccessary DC schematics...assuming you could find them.

Another problem lies in that if you were able to find the defective IC. Do you have the rework station to replace BGA chips?
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post #10 of 15
5/1/08 at 8:24pm
Thread Starter 
Quote:
Originally Posted by MrEvil View Post
I'd say it'd just be cheaper to get another motherboard. D600s are quite common, and motherboards on eBay go for probably less than what you'd pay for the neccessary DC schematics...assuming you could find them.

Another problem lies in that if you were able to find the defective IC. Do you have the rework station to replace BGA chips?
I do electronics for a living, so replacing chips is not a problem, finding the faulty ones is always a 'fun' process haha.

To charge the Battery would use a good 50+ watts of power so the trace would have to be pretty large. I may look for a large trace going between the jack and the battery and jumper it. ... Worth a shot.

I will have to meter it to find out if it will still regulate the charge rate though (as to not cook the batt)

If I find a good work around I will post up a how to.

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post #11 of 15
5/10/08 at 11:53am
Thread Starter 
Well I gave it my best,

I had one blown filter and one bad transistor.

The data line comes in goes through a filter then skips halfway across the board to under the PCMCIA slot to small transistor that will switch to pin A or pin B depending on what supply is used. the old one was burnt to a crisp so I guessed on a replacement , now my bat light just flashes red haha. oh well worth a shot,
the chance of guessing the correct IC is 1/1000

so I bought a new D600 on ebay for $170 haha
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post #12 of 15
7/4/08 at 12:13pm
Hi,

do you work on the problem yet ? I think, it`s not a transistor but a diode.
The chipcode is A7. i think, it`a BAV 99.
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post #13 of 15
4/20/10 at 4:56pm
Hi,

I have done a lot of digging around in this problem. It seems that when the charger connector gets loose from the mobo, it does something to the power supply third pin. This is actually a signal that comes from the power supply so that the motherboard identifies it properly. This is used to control how fast the battery gets charged, and it also stops anybody from using a 3rd party power supply. The problem here is that even after the connector gets changed the mobo still does not recognise the power supply. It will still run, but at a lower speed. Note in the setup menu, at what speed the system is running at. On the ones I have seen, they actually run at 600 MHz. The will run at 1200 MHz on the battery. Another place you can check also, if you are in the setup menu, go Alt-P until you see the battery page, and you will see that the power supply is "unknown".

I have followed the signal for the power supply ID, but I loose it after it leaves the choke L77, it goes to the PLA 47N254. There is nothing I can do after this. I suspect the spikes in the ID signal damages the input on this chip. The chip controls everything on the mobo. I could bypass the signals going to the Maxim charging chip, to force it to charge the battery, but I'd still be running with a system at 600 MHz.

If somebody could find a fix to get the mobo to recognize the power supply, then we would all be home free.

By the way, yes, my power supply and my battery are good, I tested them both on another system.

Another interesting thing I found while troubleshooting this issue, I found a cold solder joint on FL1, which is the choke for the power supply coming into the computer. I suspect the flexing of the board at that location broke the solder.

I guess for now I'll get a mobo from eBay.
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post #14 of 15
4/20/10 at 6:52pm
Maybe Dave can give you an input about the power supply part when he is back on.

cheers ...
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post #15 of 15
4/20/10 at 8:08pm
New developpement! All might not be lost. This is from another forum:
I am quoting user "meandmydog05" from
http://www.tomshardware.com/forum/95...pinout#t374972

"But I just found a temporary work around for the speed throttling issue. Use "Rightmark CPU Clock Utility" It will let you set the CPU multiplier to what ever. for those who don't know, CPU speed is determined by the Frontside BUS Speed (usually Fixed at a certain speed) times the Multiplier. "

I think I'll get right on it and modify this mobo!!
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