Dell Latitude 5280 does not charge the battery

[Dell (Gast)]

Hello, everyone
I have a problem with the battery, I upload a picture of the mainboard
I have an external power supply runs very well but unfortunately the 
battery is not charged
Thank you very much

[Helge (Gast)]

The encapsulated CR2032 cannot be charged. The main battery is only 
charged with original Dell power supply, which contains a one-wire ID 
chip. Check in diagnostics which power supply type is displayed.

[Dell (Gast)]

Thank you very much
I had taken the wrong power supply once, from this time the battery is 
no longer charged

[Helge (Gast)]

maybe the wrong psu injected power into the one wire pin of the laptop. 
there should be a 1k resistor and a zener, maybe one of them is broken.

[Martin (Gast)]

tested a new battery?

[Dell (Gast)]

where should i look for in motherboard now?

[Stefan F. (Gast)]

Dell schrieb:
> where should i look for in motherboard now?

Send it to the next recycling depot. You need a new laptop.

[Dell (Gast)]

if the laptop starts up normally but can't charge the battery, throw it 
away??
do you mean that?? :-)

[Dell (Gast)]

I found the chip
I think it's burned out, you can't read it anymore
there is a comparable diode PESD5V0U2BT

[Dell (Gast)]

file:///C:/Users/Test/Downloads/PESD5V0U2BT%20(1).pdf

[Dell (Gast)]

https://datasheetspdf.com/pdf-file/967766/NXP/PESD5V0U2BT/1

[Helge (Gast)]

My dell (older) has a unidirectional zener, are you sure you need a 
bidirectional type?

[dell (Gast)]

yes i need one

[Stefan F. (Gast)]

Dell schrieb:
> if the laptop starts up normally but can't charge the battery, throw it
> away??
> do you mean that?? :-)

Yes I mean that. The board is not designed for repairing and I am pretty 
sure that you do neither have the required tools nor the know-how. And 
it is to old for the repair service of Dell.

The burned ESD protection diode indicates that your computer was exposed 
to excessive overvoltage with enough energy to destroy the parts which 
the diode was not able to protect. The following damages are invisible.

If you have several hundred euros to buy the required tools and lots of 
time, you might try to replace one part after the other. But I think you 
will get stuck quickly because you cannot buy the required spare parts. 
This diode is easy, but check the availability of the microchips. And 
also check the availability of their firmware, including tools to load 
the firmware.

I fear that you will waste your money and time.