Dell Inspiron 1525 not charging Battery

[nataf10]

Hello there.
My Dell 1525 stop charging the battery.The front charger indicator (blue) does not light.
I replaced the charger controler MAX8731 (QFN) and checked all the periferial part all looks OK but still not charging.
Laptop work fine with the AC adaptor and if I use a charged battery it also work good.
Li-ion Battery was checked and found to be in good working order.

Does anyone have an ideas for solving this issue?
T.I.A

[b700029]

Re: Dell Inspiron 1525 not charging Battery

I don't know what the charging indicator is connected to (will have to find schematic for that) but have you checked if the charger MOSFETs are open, or if there is current flowing into the battery from the charger DC-DC converter (check for voltage across the current sense resistor)?

[nataf10]

Re: Dell Inspiron 1525 not charging Battery

Thank you so much b700029 for your fast respond,I checked the two charging Mosfets and even replaced them but there is no change-still not charging.I didn't checked the charging current flowing into the battery.I be glad to hear from you how to do it...
I also have the schematic diagram and I will be happy to send you a copy of the file,just ask for it...
Thank you again

[b700029]

Re: Dell Inspiron 1525 not charging Battery

I could easily find the schematic (Wistron Spears, correct?)

Current sense resistor for battery charging is R237. With a high-input-impedance multimeter (at least 1M ohm) measure the voltage across it. It is a 10 milliohm resistor so every amp of charging current will produce 10mV across it. Depending on charging current, there will be a voltage but < 10mV and probably in the uV range if the battery is nearly full.

[gretti]

Re: Dell Inspiron 1525 not charging Battery

I had a dell 1525 that was doing the same thing. Mine had a tinny burn whole on the power control chip, about the size of the head of a pin, burned in it. The chip is located just above the battery terminals. I just replaced the board because the boards are cheap for the 1525.

[nataf10]

Re: Dell Inspiron 1525 not charging Battery

Hi again.Problem solved,the center pin in the DC socket on the mother board was too open and the contact with the charger plug was bad.
Replacing the DC socket solved the problem.
F.Y.I

[laptop market]

Re: Dell Inspiron 1525 not charging Battery

http://www.facebook.com/photo.php?fb...type=1&theater

[fddizon]

Re: Dell Inspiron 1525 not charging Battery

I had a dell 1525 that was doing the same thing. Mine had a tinny burn whole on the power control chip, about the size of the head of a pin, burned in it. The chip is located just above the battery terminals. I just replaced the board because the boards are cheap for the 1525.

hi,

how much did you bought your mobo and where?

tnx

[smason]

Re: Dell Inspiron 1525 not charging Battery

Hi again.Problem solved,the center pin in the DC socket on the mother board was too open and the contact with the charger plug was bad.
Replacing the DC socket solved the problem.
F.Y.I

That *should* have given you an error on bootup.

[fddizon]

Re: Dell Inspiron 1525 not charging Battery

That *should* have given you an error on bootup.

did you mean if he uses a bad dc jack will have an error during bootup?
what would be the error?

[nambtv]

Re: Dell Inspiron 1525 not charging Battery

replace Q29