But runs on power cord fine?
Age of the laptops battery?
If your Dell 1525 does not operate on the power cord, either your power cord is at fault Or the internal dc jack connector could be broken completely.
On the Dell Inspirons 1525 & 1526 models that I have seen and repaired if the power adapter cord tests fine with multi meter, almost always replacing the DC Jack or the DC Jack Power Board has repaired the no battery charging problem.
The fault appears to be in the center pin hole of the dc jack, OR fault in the dc jack charging board in laptop.
This Dell Inspiron 1525 has a small separate dc jack power board. Photo On Right >>>>
For approximately $10-$15 part cost, other than dis-assembly & reassembly of the laptop, the part can be replaced very easily. The DC Jack board locks into a mainboard connecter and 2 screws lock it down in place from any movement.
No desoldering or soldering needed when replacing this dc jack board. The cost dc jack itself is $5, the entire dc jack & charging board is just a few more dollars. Instead of taking the additional time & to desolder and solder a new jack on and possibly still have the charging problem (meaning the problem is in the charging board), it’s simpler to replace the entire dc jack charging board in this model. Most laptops are not like this type power setup inside.
As you see in photo this DC Power Jack board also has 2 USB ports that are part of the board itself.
The 2 silver posts to the right are the 2 screw down anchor points.
Small white connector between the 2 silver posts is the main board connector.
As stated above the jack appeared normal from the inside, tested fine, receiving the correct 19.5 volts of power to the motherboard. I re-soldered all the dc jack pins thinking one of the pins might been making poor contact with the motherboard. Same problem, cord powers up laptop, battery not charging. I’m not positive on this, but I believe that center pin on the Dell 1525 / 1526 model, AND the small center hole on dc jack handles the power to the battery charging circuit.
I happened to have another Dell 1525 here for repair, this customers power cord on the “no battery charge” laptop WAS charging battery on the other Dell 1525 that was here. So I knew it was not the center pin on this particular power cord causing the no battery charge problem. And this battery was charging on the other Dell 1525 laptop that was here. THIS narrowed it down to a dc jack problem or motherboard circuit problem.
Most dc jacks on laptops are soldered directly to the laptops motherboard, desoldering and soldering of a new dc jack on these types can be difficult and more time. The Dell Inspiron 1525 & 1526 models both have a removable easily replaced DC jack Power Board inside of the laptop.
Another area to consider is the age of the battery. Just like any rechargeable battery, age decreases run time on the battery, and after so long battery will not charge, defective old battery. In this case the battery was fairly new, tested and charged in another laptop.
Component cost approx $10-$15
Dell 1525 /1526 Models
Physically check your old part# inside of your laptop out
This dc jack board screws down into base of laptop, motherboard then rest down onto, and connects into male socket of dc jack board and secures to motherboard by 2 screws… locking the dc jack charging board into place.
Other than the complete “teardown” and re-assembly of the laptop, replacing this part is very cheap, easy and no soldering involved.
I have had at least several Dell Inspirons 1525 or 1526 models in with the no charging problem. All were repaired by replacing this dc jack usb charging board.