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HP Probook 640 G2 CAPS/NUM lock 5 blinks

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    #1

    HP Probook 640 G2 CAPS/NUM lock 5 blinks

    Hi

    Please, i have this HP Probook 640 G2 that the CAPS/NUM lock blinks 5 times and powers off.

    According to the blink code, it is a system board failure. Any ideas where to check for faults?

    There was a short capacitor near one of the 3v/5v power regulator which has been replaced.
    Last edited by SMDFlea; 11-12-2020, 08:52 AM.
    Tags: None
    #2
    Re: HP Probook 640 G2 CAPS/NUM lock 5 blinks

    Originally posted by classicandy View Post
    Hi

    Please, i have this HP Probook 640 G2 that the CAPS/NUM lock blinks 5 times and powers off.

    According to the blink code, it is a system board failure. Any ideas where to check for faults?

    There was a short capacitor near one of the 3v/5v power regulator which has been replaced.

    I need the schematics/boardview too if available. No luck in finding it via google.

    Hi, I am facing same problem but model number is different , share motherboard part number

    Comment

      #3
      Re: HP Probook 640 G2 CAPS/NUM lock 5 blinks

      Hi this can be 2 problems me region clean of original bios or change the processor. I got the same with my hp probook 450 g1 there was the processor the fault.

      Good luck

      Best regards

      Steve

      Comment

        #4
        Re: HP Probook 640 G2 CAPS/NUM lock 5 blinks

        Thank you SteveB

        There are number of possibilities, correct me if i am wrong

        1- short in motherboard like power supply shortage
        2- BAD RAM
        3- RAM voltage is missing DRAMPOWR like signal i don't remember correctly
        4- BIOS chip itself is faulty , we can check bios chip faulty or not by checking resistance in between pin 4 ground and pin 8 VCC

        5- if you are not getting VCC=8 pin 3.3 volt

        6- BIOS is OK but your KBC is not communicating with BIOS

        7- your 1Volt voltage is not coming which is also linked to VCCSA or vCORE
        Last edited by stingerchamp; 11-12-2020, 10:46 AM.

        Comment

          #5
          Re: HP Probook 640 G2 CAPS/NUM lock 5 blinks

          By my were all power rails present. First you must check that all power rails are present on the motherboard. Do you hear also the fan at maximum. Even the supply at the cpu was present.

          Good luck

          Regards Steve
          Last edited by Stevedb; 11-12-2020, 11:48 AM.

          Comment

            #6
            Re: HP Probook 640 G2 CAPS/NUM lock 5 blinks

            Hi there did you fix the laptop?

            Regards

            Steve

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