I have a Asus TUF B450M Plus Gaming motherboard with USB over current issue. I have removed all the problematic protection ICs from the affected USB ports. However, I am still stuck at USB device over current and shutdown in 15 seconds with no opportunity to reset BIOS.
Here is my plan.
Use SOIC test clip, USB CH341 and NeoProgrammer to backup the BIOS in the motherboard. I have all these items from my modding Kaby Lake to Coffee Lake project. I need to know what extension to save backup BIOS as e.g. .BIN or .ROM
(I save the backup with BIN extension. NeoProgrammer can do both.)
Download the BIOS from Asus support in .CAB format. Extract .BIN or .ROM from .CAB file. What tool should I use to do this ?
(I use UEFITool to extract the body. Right click on AMI Aptio Module and select option 2.)
Flash the extracted BIOS(no mod BIOS needed) using SOIC test clip, USB CH341 and NeoProgrammer.
(Make sure that 8 pin connector is inserted into the slot further from clam handler and pin 1 facing the handle. If NeoProgrammer does not have 25LB128D then upload it to the chiplist by import.xml. Content of xml: GD25LB128D id=“C86018” vcc=“1.8” page=“256” size=“16777216”/)
Is my plan workable ?
(The flashing worked but not fixing USB over current.)
Thanks in advance.
Latest bios 4622 is a .CAP file as usual in Asus desktop mbs.
Bios reflash most likely won’t fix any of this widely known around the web, usb overcurrent issues…what has bios to do with a remove protection fuse?
The protection fuse that you are referring is a same as the SOT23-6 chip? The PC boot into BIOS after I removed the 4th chip. The problem came back after 30 minutes.
Thanks. It’s the same thing. I saw on Youtube that reflashing the BIOS was also needed. This is the reason I ask. Is it possible that another bad chip is still on the motherboard ? I use USB digital tester and all ports are showing 5V and above. This chip has marking AGOY18(the 18 is rotated 90 degree counter clockwise). Any idea of compatible chip that I can use as replacement? Since I do not have any replacement, I am a bit hesitant to remove further.
@MeatWar, Salute. I managed to reflash the BIOS with version 4622. You were right. The problem didn’t go away but I was able to get into the BIOS after the reflash. I google “MBS_SOT23_6P” and after hours, it led me to a boardview of the motherboard. I can’t see it. Of course, I google again and found boardviewer. The USB digital tester showed less than 5V for USB12. I used multimeter and check pin 5 of UD5 and OD400, both showing about 4.5V. I saw on youtube some “expert” used a thin wire and shorted a resistor to fix the low USB voltage. In this case, is it possible that OR402 and OR403 are causing the low voltage of USB12 ports? Thank you in advance.
chatGPT gives the possible replacement part for AGOY18(SOT23-6) after reviewing the motherboard boardview as AP2553W6-7 or FPF2140. It gives SOT23-6 overcurrent pin 4 and its status.
Goes LOW (0V) when a fault (short or overcurrent) is detected
Stays HIGH (3.3V or 5V) when all is normal
Here are the possibilities.
