850 g5 6050a2945601-mb-a01 bios

[SMDFlea]

Not sure what the go is with this one. I had left it doing final Windows 11 updates, when I came back to it later had high fan spin and forcibly turned it off with power button. Not sure if this was a bad Windows F/W update or not. Now all I get is 7 orange blinks on the battery light when the power is applied either via barrel adaptor or USB-C. This doesn't seem to line up with anything in the manual. AFAIK, it was already on V1.31 BIOS which is supposed to be the latest.

One other weird thing is it is flattening the BIOS battery after I just have replaced it but I think that is a side issue. Attached are the dumps for BIOS (U365) and EC (U366). S:N is 5CG8100CT2. BIOS looks ok in UEFI tool.

Edit. Was checking the CMOS battery issue and found 12 ohms on P3V3_RTC and only .75V present. Usually I find these issues to be PCH related but there quite a few things on this rail.

Edit 2: Bloody cap! I put 3V onto that rail and it finally went full short. Was C4766 (1uF 0201) just on the other side of the board from the CMOS battery connector. Now it starts up.

Flash attached U365 ,flash original U366 back as-is.

[reformatt]

Thanks Flea. I had modified U366 with another dump prior to finding the leaky cap (thinking it was an EC update failure). Once the cap was replaced, the laptop booted up, however reported an Endpoint Security failure. I did try a downgrade to V1.30 to reflash but it bricked the machine. Restoring both my original dumps resolved that so messing with the EC bios you will get this problem.

The primary fault was the leaky cap on P3V3_RTC pulling it down to 0.75V. It measured 12 ohms initially, but went full short when I injected 3V onto it.

[bajticzek]

Hi,
this Elitebook I bought was previously worked on. Symptoms included 5 short CapsLock blinks and fans on full speed. Core voltages were missing, I found rotten trace from VRM controller, repaired it and the laptop sprung back to life. The 5 blinks before booting persisted. I blame the content of Winbond flash as soldering on legs was visible and the content might be wrong. The correct serial number showed in BIOS, so I tried to do a BIOS update. The BIOS version was Q78 v01.07.00. It didn't accept newest update, so I tried the closest one to the old. I found v01.09.00. Content of the update was succesfully copied (progress bar finished), then error notification about the USB-C controller firmware being the same version as in the update file (which is fine), then reboot and infinite black screen with 5 blinks and fans on full speed. I tried various recovery procedures, none works. The laptop has the Sure Start feature.

I uploaded current content of W25Q256JV flash memory.
The serial number of laptop is 5CG9034328.

Any help is appreciated.

[peste]

post merged...next time look for a thread with the name and model, motherboard model of the laptop, and post there, if you can't find it, then make a new thread..

[bajticzek]

Can anyone provide the correct (or my repaired) BIOS for this laptop, please?