This is a follow-up to the now-automatically-closed thread I guess this AMD7640U is dead? . @Matthew_Rathbone, I don’t suppose you have any additional news on the state of your mystery board?
I’ve been doing a bit more investigation, in the hopes that I could identify the failed voltage regulator (as is suggested by the DIAGNOSTICS_VCCIN_AUX_VR code in the blink code). I spotted some corrosion on the back, apparently liquid damage, and I was also wondering if your mainboard had the same damage present @Matthew_Rathbone? See the blue corrosion in the upper section of the attached image.
Additionally, the chip immediately adjacent to the corrosion seems to be a voltage regulator IC, based on the label it seems to be the MPS MP2845B, which I wasn’t able to find much documentation for, but I did find this page: MP2845BGQK-Z MP2845B MPS AMD SVI3 Digital Multi-Phase Controller | Chipset Elektronik Teknolojileri A.Ş. , (translated to english: https://www-atombilgisayar-com.translate.goog/mp2845bgqk-z-amd-svi3-controller-5471?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp), which describes it as a “Digital Multi-Phase Controller” voltage regulator solution. So it seems like I’m on the right track! Can anyone provide a schematic or parts list (or maybe even just a high-quality photo or some multi-meter measurements from a working FW13 7640U mainboard) for the components around it? If so, I think I can replace the components damaged by the corrosion, and hopefully fix the board!
Edit: here’s a closer picture of the corrosion and nearby components.
Edit 2: one more photo, after attempting to clean the corrosion with isopropyl alcohol:
