Dell Latitude 5580 no post and hot usb controller

[Uprangewilly]

So I had a one of those late night, knee jerk ebay bids on a Dell Latitude 5580. It will power up when I plug in the power supply and shuts off after about ten seconds. No image on screen, no fan. This is all with the cmos unplugged. It won't even try to start with the cmos plugged in, tested below 3v.

I was trying to take some voltage readings with the power supply plugged in and noticed the usb controller was getting very hot. I removed the usb-c port from the board because it looked damaged. No change. Any guidance would be appreciated.

Mother board is a LA-e152p
Usb controller TPS65982DA

[mon2]

Re: Dell Latitude 5580 no post and hot usb controller

If the PD controller is turning into a micro furnace then something is wrong and suspecting this part is damaged.

You can source these from the TI.COM webstore (only at this time) and suggest to replace the part to see if the component continues to heat up. Do not dispose of the original PD controller and consider to locate a stencil for reballing this device (Aliexpress should have these).

This PD controller makes use of firmware that is stored inside UT6 SPI flash device. So it should be possible to just replace this PD controller with a fresh one.

Then review which PD contract is selected upon power up.

[Uprangewilly]

Re: Dell Latitude 5580 no post and hot usb controller

Thank you for replying. I have been researching reballing after reading your response. Hopefully it is something I can accomplish at my kitchen table.

I removed the motherboard today to have a closer look.i discovered a bad solder joint on the opposite side of the hot chip. It looks like a deep crater. I will try to upload a picture.