Motherboard diagnostic LED states

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia
    #1

    Motherboard diagnostic LED states

    I've identified no more than 16 possible states for indication of motherboard diagnostic states which can be indicated with only 4 single colour LEDs which is:
    • No power applied (all off)
    • Power applied - no standby to RAM (one is on)
    • Standby to RAM


    In sequence after power on not waking from standby to RAM:
    • Power supply rail(s) missing or out of tolerance (includes CPU +12V)
    • Power supply protection shutdown (trap - also display before boot)
    • Onboard DC-DC converter failure (includes CPU DC-DC converter)
    • CPU failure
    • BIOS checksum failure
    • Platform Controller Hub (PCH) failure
    • Memory failure
    • Video system failure
    • CPU fan failure
    • CPU over temperature shutdown (trap - also display before boot)
    • Invalid configuration/CMOS RAM battery failure/overclocking failure
    • Boot failure
    • Boot OK (all illuminated)


    For the CPU/PCH/video, a single failure code is indicated if any part of it fails e.g. for the PCH, the IRQ controller, timer etc.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30937
      • Albion
      #2
      Re: Motherboard diagnostic LED states

      i must have missed something,
      what motherboard(s) and what leds.

      the only boards i'v seen with leds are some old dual cpu servers with a row of leds,
      and a couple of athlon gaming boards that had a 2digit display.

        Comment

        • eccerr0r
          Solder Sloth
          • Nov 2012
          • 8670
          • USA
          #3
          Re: Motherboard diagnostic LED states

          I used to have an old P4 board (MSI branded ATX, desktop board) that had 4 diagnostic LEDs on the back panel that counted from 0 (all off) to 15 (all on) as it went through POST, each meaning something different as it progressed...

          Alas it was a P4 so that's why it's gone...

            Comment

            • Dan81
              SNES-powered
              • Oct 2013
              • 1865
              • Romania
              #4
              Re: Motherboard diagnostic LED states

              That would be MSI's D-Bracket you're talking about. I have mine installed on a Athlon XP 2500+ nF2 build, which features an MSI K7N2 Delta-ILSR mobo.
              Main rig:
              Gigabyte B75M-D3H
              Core i5-3470 3.60GHz
              Gigabyte Geforce GTX650 1GB GDDR5
              16GB DDR3-1600
              Samsung SH-224AB DVD-RW
              FSP Bluestorm II 500W (recapped)
              120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
              Delux MG760 case

                Comment

                Previous template Next

                Related Topics

                Collapse
                • Bonaventure Vigil
                  Variable DC Power Supply cannot boot motherboard
                  by Bonaventure Vigil
                  Hi there,
                  Guys anyone here can help me. During troubleshoot the motherboard, my 1st and new psu unable to boot the motherboard. Even though i set the 20V, my old Compaq CQ42 motherboard had the led white light at charging port. When press on button, the led blinking to red and gone back to white state. But i change the oem hp compaq adapter which is i measure 19.45V. Using that can boot the motherboard and fan spinning. Then i reconnect psu and tried set the 19.45V, still blinking red. Anyone know what happen? Is it psu not compatible? All is check and voltage is there....
                  10-17-2024, 12:16 AM
                • elzorroazul777
                  [Troubleshooting] Dell T7610, computer won't post after turning on memory mapped IO >
                  by elzorroazul777
                  I have a Dell Precision T7610, 2 Xeon 2650 v2, 128Gb of ram, MB NK70N. Bought off of ebay in December and shipped with 1 processor and 64 gb of ram. I recently filled the other side of the board with processor #2 and 64 more Gb of ram. There are two gpu's, Nvidia K420 for video and Nvidia P40 for accelerated graphics. I have shelled out my entire budget on electronics tools and building this ‘homelab' computer. I do not have the money to buy another motherboard at this time, otherwise I would!

                  The motherboard that shipped with the computer needed replacement as socket #2 wasn't...
                  02-14-2023, 09:57 AM
                • reformatt
                  Intel iMacs, 3rd party SSD failures and Fusion setups
                  by reformatt
                  I thought I'd throw out some of my personal experiences in the last 12 months with Intel iMacs, 2.5" SATA SSD drives and Fusion drive data recoveries.

                  As a backgrounder, Apple never fitted a 2.5" SSD's to these iMacs. Apple's SSD option was a system of 32GB NVMe blade drive (NGFF connector) and Seagate 1TB 2.5" HDD, married together in software to become a Fusion drive. Non Fusion systems have just the 1TB Seagate HDD.

                  So, the most common reason an iMac comes across my bench is because it's either ridiculously slow, or it fails to boot at all. The most...
                  12-18-2024, 10:34 PM
                • fluzocapacitor
                  ACER Aspire 5542 does not boot. Can not read BIOS on the motherboard
                  by fluzocapacitor
                  Hi,

                  I am trying to fix an Acer Aspire 5542. Upon turning it on, the fan starts to spin for a few seconds and then it stops. I hear no beeps from the speaker. I have no image both on the laptop screen and through VGA and HDMI connectors.

                  I measured voltages, and it seems all power supplies are OK. There are 5V, 3.3V (BIOS), 1.8V (RAM), and 1.1V (VCORE).

                  I tried to read the BIOS using a CH341A programmer, but it did not detect the chip. I took the BIOS chip away from the motherboard, and then the CH341A detected the chip, and I was able to read the code. However,...
                  02-01-2024, 01:24 PM
                • vallllliiii
                  Gigabyte motherboard GA-H110M-S2PH (rev. 1.0) DDR3 | Boot loop and 5 beeps
                  by vallllliiii
                  Hi, last month i bought a broken pc that i tought i can fix for myself but it turned out to be time consuming. The pc turn on and shows no display and beeps 5 times and restarts again and again, i think it s the motherboard because i tested/replaced all the parts except the motherboard. The pc was used mostly for light gaming and i think it wasnt overclocked or something. I tried all the basic fixes(cleaning the ram slots, removing the cmos battery, reseat the GPU/CPU/RAM). I think the last thing to do is to replace or repair the mobo but i prefer to try to repair because i don t want to spent...
                  08-18-2024, 09:21 AM
                • Loading...
                • No more items.
                Working...