HP 460 G4 boot loop restart

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Askic
    Senior Member
    • Sep 2018
    • 187
    • BIH
    #1

    HP 460 G4 boot loop restart

    Hello,

    I have HP 450 G4 laptop with DA0X83MB6H0 motherboard that is stuck at boot loop restart.
    When powering ON, firste there is a dealy about 10 sec before showing HP logo and then after 15 to 20 sec it restarts itself.

    If I try to enter BIOS (with F10) or Sys diagnostic (F2) there is a message "Entering Setup" or "Entering diagnostic" and after 20 sec restart.
    I have tried with different BIOS dumps, exchange RAM modules remove/short CMOS battery and many more, but it didn't change behavior.

    Keyboard is working since it detects function keys. If I place another RAM module, after first power ON I can see a message "Amount of RAM changed", and that stays for about 20 sec and new restart.

    So basically, it is stuck at boot loop before it is possible to enter BIOS settings.

    There is a problem on the board, but don't know from where to start. Did you have any similar experience?

    Thank you
    Last edited by Askic; 02-08-2021, 02:57 AM.
    Tags: None
    • peste
      Super Moderator
      • Dec 2016
      • 12226
      • ROMANIA
      #2
      Re: HP 460 G4 boot loop restart

      Originally posted by Askic
      Hello,

      I have HP 450 G4 laptop with DA0X83MB6H0 motherboard that is stuck at boot loop restart.
      When powering ON, firste there is a dealy about 10 sec before showing HP logo and then after 15 to 20 sec it restarts itself.

      If I try to enter BIOS (with F10) or Sys diagnostic (F2) there is a message "Entering Setup" or "Entering diagnostic" and after 20 sec restart.
      I have tried with different BIOS dumps, exchange RAM modules remove/short CMOS battery and many more, but it didn't change behavior.

      Keyboard is working since it detects function keys. If I place another RAM module, after first power ON I can see a message "Amount of RAM changed", and that stays for about 20 sec and new restart.

      So basically, it is stuck at boot loop before it is possible to enter BIOS settings.

      There is a problem on the bopard, but don't know from where to start. Did you have any similar experience?

      Thank you
      post the bios backup in the section
      "BIOS Requests ONLY!" ...
      Due to a lack of donations, server free space at a critical level, and possible closure of Bios Requests all donations are welcome, click:

      >>>>> https://www.badcaps.net/index.php?pageid=donate1 <<<<<

      Every donation made will go towards server fees and maintenance costs.

        Comment

        • Askic
          Senior Member
          • Sep 2018
          • 187
          • BIH
          #3
          Re: HP 460 G4 boot loop restart

          I'm almost certain this is not a bios issue. I have the same board which works and I even solder its BIOS chip but it behaves the same. I even swap the BIOS chips. The issue is something with the motherboard.

          For example when measuring resistance against the ground on PL22 it is 4 ohms, while the same resistance on the correct one is about 11 ohms.
          Interesting, I cannot measure any voltage on this coil on both boards, but one board works fine.

          The only difference I could find so far it this resistance, but it is expected to be low, since it is CPU area.
          Attached Files

            Comment

            • mcplslg123
              Badcaps Legend
              • Jun 2015
              • 7262
              • india
              #4
              Re: HP 460 G4 boot loop restart

              Try replacing PC262/276/279

                Comment

                • Askic
                  Senior Member
                  • Sep 2018
                  • 187
                  • BIH
                  #5
                  Re: HP 460 G4 boot loop restart

                  Originally posted by mcplslg123
                  Try replacing PC262/276/279
                  Those are big electrolytic caps. Do you suspect that their resistance has changed?
                  What DC voltage on this PL22/ caps is to be expected, 0.9V??
                  Last edited by Askic; 02-08-2021, 11:58 AM.

                    Comment

                    • Askic
                      Senior Member
                      • Sep 2018
                      • 187
                      • BIH
                      #6
                      Re: HP 460 G4 boot loop restart

                      Here is that part of the power supply in which I cannot measure any voltage. I can measure VIN to be 19.5V. Without power, resistance between Drain and Source of PQ10 low side MOSFET. I have taken it out and between pins there is still 4 ohms and PQ10 is good.

                      I would normally expect to measure here around 1 V, but there is nothing there. I must say, that this is probably not the issue because I have picture on the screen and HP logo for about 20 sec.
                      Attached Files

                        Comment

                        • piernov
                          Super Moderator
                          • Jan 2016
                          • 4435
                          • France
                          #7
                          Re: HP 460 G4 boot loop restart

                          You know you can't just swap SPI ROM between boards because ME region is paired with the PCH right?
                          OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                            Comment

                            • Askic
                              Senior Member
                              • Sep 2018
                              • 187
                              • BIH
                              #8
                              Re: HP 460 G4 boot loop restart

                              Originally posted by piernov
                              You know you can't just swap SPI ROM between boards because ME region is paired with the PCH right?
                              yes and I wrote in the first post that I have tried different BIOS dumps. I even used cleaned BIOS dumps from one forum. However, I’m really not sure why behaviour is like that to restart laptop after 20 sec. When different ME region laptop usually works very slow, but not restart after the same time period. It detects function key F10 and there is a message Entering Setup... and after that new restart.

                              Do you think that problem is likely related to BIOS/SPI ROM issue than hardware? I must admit I have never had this behaviour.
                              I know these are typical symptoms of mismatch Between ME region in BIOS software and PCH:
                              1. If ME Region Get Corrupted In Most Cases The System Will Start At Least, But Not Total Dead.
                              2. Fan Spinning At 100% Full Speed.
                              3. Random Shutdow at Regular Interval ( Say 1min, 30min, even 1 Hours…).
                              4. When Facing Problem With Reboot Seems ME Region May Corrupted.
                              5. Corrupted ME Region May Cause Hanging Problem.
                              6. Somtimes Corrupted ME Region May Cause Spalsh Screen.
                              7. Corrupted ME Region May Cause Slow Down System Performence.


                              So there is a reboot/shutdown at regular intervals, but in all cases so far, I could at least enter setup or no start computer at all.
                              Last edited by Askic; 02-08-2021, 02:46 PM.

                                Comment

                                • piernov
                                  Super Moderator
                                  • Jan 2016
                                  • 4435
                                  • France
                                  #9
                                  Re: HP 460 G4 boot loop restart

                                  I was referring to:
                                  When powering ON, firste there is a dealy about 10 sec before showing HP logo
                                  and
                                  I even swap the BIOS chips.
                                  OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                    Comment

                                    • mcplslg123
                                      Badcaps Legend
                                      • Jun 2015
                                      • 7262
                                      • india
                                      #10
                                      Re: HP 460 G4 boot loop restart

                                      Originally posted by Askic
                                      Those are big electrolytic caps. Do you suspect that their resistance has changed?
                                      What DC voltage on this PL22/ caps is to be expected, 0.9V??
                                      Yes , 0.9V seems ok to me. Electrolyte caps loose their capacitance over time-thats why try replacing them.
                                      Last edited by mcplslg123; 02-08-2021, 11:00 PM.

                                        Comment

                                        Previous template Next

                                        Related Topics

                                        Collapse
                                        • throwaway327
                                          Asus ROG Ally X -RC72LA - changed hidden bios settings with 'Smokeless-UMAF', won't get past boot logo
                                          by throwaway327
                                          ASUS ROG Ally X - (Handheld Gaming PC)
                                          Model No: RC72LA
                                          Serial No: SBNVKD001014459

                                          Hi all, I've spent the past week digging through the forums and guides to try correct my foolish mistake of changing hidden settings while tinkering around, and to be honest my heads overloaded so I'm hoping you'll be able to help.

                                          I used a tool called 'Smokeless-UMAF' to access usually hidden settings in the bios. I tweaked one or two 'safe' things but made the mistake of tweaking a lot of settings under 'USB/Thunderbolt Configurations' when I didn't know what they did. For...
                                          06-18-2025, 05:52 PM
                                        • q2v5
                                          Lenovo T480s, what's up with this Bios, modded boot logo, reflashed now bricked
                                          by q2v5
                                          Lenovo T480s
                                          Model 20L8-S3TE00
                                          Board ET481-U10
                                          Chip MX25L12873F

                                          Hi, I have a few of these & they came with a custom bios boot logo, no passwords etc.

                                          2 x were brand new unused but with custom boot logo, 1 I installed Windows/ran updates then it bricked itself. 1 wouldn't get past the custom bios boot logo.

                                          The third I loaded windows, took a backup of the bios chip, then tried to flash several different clean bios's via programmer which all caused it to not boot. I tried to reflash the original bios both using clip & desoldering but...
                                          08-15-2024, 10:40 PM
                                        • NolesFan
                                          Samsung un82ru88000f - Boot loop sort of but can correct with taping of LVDS ribbon
                                          by NolesFan
                                          Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I...
                                          2 Photos
                                          10-24-2024, 06:36 PM
                                        • Max029
                                          Lenovo LOQ mdl 151RH8 bios Q: Can't get usb boot to list
                                          by Max029
                                          I've searched and read Beginners guidelines and other sticky threads. This is just a simple bios question. If I may, I'm having trouble finding any help, including from lenovo tech support & forum, for how to get usb boot to list in boot options. I'm trying to run memtest86 so nothing as highfaluting as re-install, flash a bios, etc.

                                          I've made usb boot enabled and secure boot is disabled. I can find no other option in bios ver LZCN34WW (the original bios). Would anyone here be familiar with LOQ or Legion bios versions & know what is going on?


                                          TY,
                                          ...
                                          08-18-2024, 08:28 PM
                                        • Takeatry
                                          Yet another Samsung QLED Boot Loop
                                          by Takeatry
                                          Samsung QLED QN50Q — purchased 2022 started experiencing a delay in the picture coming on in the morning less than 2 years later. Did not know the term boot loop at that time. As the loop delay ran into a few minutes did all the recommended troubleshooting, soft and hard reset, changing cables and outlet locations, no help. As the delay increased contacted Samsung tech group and allow them remote access the tv. Tech was moving too fast to see exactly what he was doing but this ultimately it was also no help. Lived with the delay until it stretched out over 6 hours. Pulled of off the back cover...
                                          2 Photos
                                          10-04-2024, 02:57 PM
                                        • Loading...
                                        • No more items.
                                        Working...