AC power jack issues

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While trying to upgrade my Dell Latitude cp, some how the power-in jack =
quit working. The system will boot up on the battery, but as soon as I =
plug in the ac adaptor, it shuts the whole thing off.
Here's what I upgraded:  new display screen, new battery (now fully =
discharged -ouch), larger hard drive. None of these SHOULD have anything =
to do with the power jack.

This notebook has always run off the ac adaptor, and charged the battery =
(although the battery would not hold the charge... hence the new one)
Something happened somewhere (short?)=20

In the mean time, I put everything (but the display screen) back to =
original state to check that out. I don't recall if this started =
happening as soon as I replaced the screen.

My question is: Does this sound like I'll have to replace the whole =
motherboard? Any ideas what to do?  Buy a new notebook? WAH! I just =
bought all the parts except the ram to make it better too!

Thanks in advance for any replies. Please reply to email below.

Debi S King

David King
Apple Automotive
9645 SW Frewing St.
Tigard, OR 97223

Re: AC power jack issues

David King wrote:
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My first thought is that the main fuse has opened from a ground fault.


Re: AC power jack issues

Where is the "main fuse'? Is this something I can replace? If it can be
done, I'm capable (I've worked on computers and cars, but I'm learning more
than I thought I'd need to get this notebook useable!)

Debi S King


Quoted text here. Click to load it

Re: AC power jack issues

David King wrote:
Quoted text here. Click to load it

The problem with an opened main fuse is the fact that it opened (if it
has opened). You need to find the fault.  Most often, the fault is a
liquid spill or poking around when the unit had power.  In your case,
review all of the steps you took in doing the replacements, particularly
wiring.  Don't overlook a mainboard fracture at the DC jack. Check the
AC adapter voltage also.

Some mainboards have a readily recognizable and replaceable fuse - a
glass cylinder with metal caps on the ends and a wire inside.  Most,
though, have a fuse that is a 3/8 - 5/16 inch (9 - 7 mm) cube or nearly
cubic, surface mounted.  Most, but again, not all, are located near the
DC jack.  Once can sometimes trace the conductors to find the fuse.
(The fuse looks unlike any other component on the board.)  You can
solder a fast-acting picofuse of the correct amperage across the end
terminals.  Use the amperage on the AC adapter to size the fuse.  Some
fuses have the amperage stamped on the top with the max rated
temperature - 8A 50C, etc.

Realistically, very often the fault is not the fuse, but a failed power
supply or mainboard.


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