B450 LED Standby Behavior

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  • calipso99
    Member
    • Nov 2023
    • 11
    • Venezuela
    #1

    B450 LED Standby Behavior

    So i got a B450 mother with a Ryzen APU, if i turn on the power supply without the CPU installed, motherboard standby LEDs will turn on and remain on, if i do the same but with the cpu installed, motherboard stand by lights will turn on and off and then remain off.

    has anyone seen that kind of behavior?
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30979
      • Albion
      #2
      Re: B450 LED Standby Behavior

      did it ever work with that part number cpu?
      these boards are a bastard because the cpu MUST be supported by the bios.

        Comment

        • calipso99
          Member
          • Nov 2023
          • 11
          • Venezuela
          #3
          Re: B450 LED Standby Behavior

          Its a used board, i dont know what cpu used to run on this board, previous owner told me he hasnt touched the bios. My chip is a Ryzen 5 3400G tho. and someone has also recommended me flashing back to a previous bios

          thanks for replying tho.

            Comment

            • calipso99
              Member
              • Nov 2023
              • 11
              • Venezuela
              #4
              Re: B450 LED Standby Behavior

              Originally posted by stj
              did it ever work with that part number cpu?
              these boards are a bastard because the cpu MUST be supported by the bios.
              Flashing back to a bios previous to Ryzen 5000 series release didnt do anything

                Comment

                • stj
                  Great Sage 齊天大聖
                  • Dec 2009
                  • 30979
                  • Albion
                  #5
                  Re: B450 LED Standby Behavior

                  i would have flashed the newest bios - not an older one.
                  btw, the bios writes to the syscon - you cant downgrade the syscon - i think AMD calles it AGESA.

                    Comment

                    • calipso99
                      Member
                      • Nov 2023
                      • 11
                      • Venezuela
                      #6
                      Re: B450 LED Standby Behavior

                      Originally posted by stj
                      i would have flashed the newest bios - not an older one.
                      btw, the bios writes to the syscon - you cant downgrade the syscon - i think AMD calles it AGESA.
                      I flashed to newest bios before, and still wont post. all i want to know is that the board has good PCH. everything else is fixable.

                        Comment

                        • stj
                          Great Sage 齊天大聖
                          • Dec 2009
                          • 30979
                          • Albion
                          #7
                          Re: B450 LED Standby Behavior

                          how are you flashing it?

                            Comment

                            • calipso99
                              Member
                              • Nov 2023
                              • 11
                              • Venezuela
                              #8
                              Re: B450 LED Standby Behavior

                              Originally posted by stj
                              how are you flashing it?
                              flashback button on the back, this model has that feature. ive seen guides about it and motherboard seems to do the flashback with no issues.

                                Comment

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 30979
                                  • Albion
                                  #9
                                  Re: B450 LED Standby Behavior

                                  your lucky,
                                  i have a B350 here that doesnt have that feature.
                                  it uses a specialised flash chip so i cant even do it the hard way till my new programmer arrives from china that can flash in 4bit mode!

                                    Comment

                                    • calipso99
                                      Member
                                      • Nov 2023
                                      • 11
                                      • Venezuela
                                      #10
                                      Re: B450 LED Standby Behavior

                                      Originally posted by stj
                                      your lucky,
                                      i have a B350 here that doesnt have that feature.
                                      it uses a specialised flash chip so i cant even do it the hard way till my new programmer arrives from china that can flash in 4bit mode!
                                      I would gladly swap that flashback feature for a working motherboard or system. but... it is what it is, electronics can be so dodgy and finicky

                                        Comment

                                        • calipso99
                                          Member
                                          • Nov 2023
                                          • 11
                                          • Venezuela
                                          #11
                                          Re: B450 LED Standby Behavior

                                          Originally posted by stj
                                          your lucky,
                                          i have a B350 here that doesnt have that feature.
                                          it uses a specialised flash chip so i cant even do it the hard way till my new programmer arrives from china that can flash in 4bit mode!
                                          Being honest i forgot to mention something about the board, someone borrowed me a multimeter, which i set in continuity mode, started testing voltage rails on the power connectors to ground, got beeps on most of them. CPU side was giving me beeps, and the 24 pin was giving a lot of beeps on a lot of the pins.

                                            Comment

                                            • stj
                                              Great Sage 齊天大聖
                                              • Dec 2009
                                              • 30979
                                              • Albion
                                              #12
                                              Re: B450 LED Standby Behavior

                                              switch to resistance mode.
                                              a beep just means 50 ohms or less - it could be a capacitor charging
                                              that said, shorted fets wouldnt be unusual.

                                                Comment

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