Clevo n870hc / No boot

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • cdgold3
    Member
    • May 2018
    • 23
    • Cleveland

    #1

    Clevo n870hc / No boot

    Hi Guys,

    I looking for some advice.

    I have a Clevo n870hc that's has stopped working. Plugging the power adaptor in and displays a amber light on front. (No Battery installed)
    If power button is pressed that the led turns green for a few seconds and go back to amber.

    With battery attached the changing circuit seems to be fine and laptop was displays amber and when battery is
    changed it goes green as it should so i'm guessing the ITE is working.

    On the odd occasion when pressing the power button, the power button led stays on and both the CPU and GPU fans kick in but after a few seconds they
    shuts down and wont restart. On that occasion the screen stays blank and displays nothing, not even a back light.

    Where would the best place for me to start?

    Thanks
    Attached Files
    Last edited by cdgold3; 07-06-2020, 06:46 PM.
  • cdgold3
    Member
    • May 2018
    • 23
    • Cleveland

    #2
    Re: Clevo n870hc / No boot

    Doing some basic testing:

    AC Port = 19.30v
    Bios u43 = Ground + pin 8 = 2.84v (Pin 1 + 8 = 2.84v)

    Will update when i get more

    Comment

    • Duranitron
      Badcaps Veteran
      • Jul 2014
      • 544
      • Philippines

      #3
      Re: Clevo n870hc / No boot

      did you do all the basics. substitute with known working memory module.. check the rtc cmos battery, check all the ALW voltages the 3.3ALW and 5vALW.. try to reflash bios with known working bios dump. be sure to save your original bios for backup. look for burnt parts or overheating parts... gud luck
      Last edited by SMDFlea; 07-07-2020, 06:49 AM.
      Never stop LEARNING because life never stops TEACHING!

      Comment

      • cdgold3
        Member
        • May 2018
        • 23
        • Cleveland

        #4
        Re: Clevo n870hc / No boot

        Thanks Duranitron

        I have started doing a cap test and found shorts in:

        Page 66 - Gpu
        c587, c616, c618, c619, c621

        Page 55 - Processor 5/6
        c594, c595

        Page 56 - Processor 6/6
        c596, c579

        Before i start changing the caps, i cant seem to find what may have caused the issue. Possable GPU/CPU Temp?

        Comment

        • cdgold3
          Member
          • May 2018
          • 23
          • Cleveland

          #5
          Re: Clevo n870hc / No boot

          It also seem to be around the bottom of the board as well, in the cpu and gpu area.

          Unless i am doing something wrong?
          Attached Files

          Comment

          • Duranitron
            Badcaps Veteran
            • Jul 2014
            • 544
            • Philippines

            #6
            Re: Clevo n870hc / No boot

            do diode mode test and test it again.. remember the processor or gpu only uses 1.2v or less a low resistance like 10 to 3 ohms are good or maybe a cap is fried.
            Never stop LEARNING because life never stops TEACHING!

            Comment

            • Duranitron
              Badcaps Veteran
              • Jul 2014
              • 544
              • Philippines

              #7
              Re: Clevo n870hc / No boot

              have you check the processor fan for gummed or clogged dirt in side.. that maybe the cause.. an over heating processor or a toasted gpu...do you own this laptop if so.. before a gpu die it displays symptoms like sudden hung.. blue screen of death or screen freezes but the mouse pointer moves.. that kind of thing.. try to look for shorted cap and hoping to find shorted one or if not.. the gpu is toasted..
              Never stop LEARNING because life never stops TEACHING!

              Comment

              • cdgold3
                Member
                • May 2018
                • 23
                • Cleveland

                #8
                Re: Clevo n870hc / No boot

                I removed cap c578, tested on bench and works fine removed

                Comment

                • cdgold3
                  Member
                  • May 2018
                  • 23
                  • Cleveland

                  #9
                  Re: Clevo n870hc / No boot

                  Originally posted by Duranitron
                  have you check the processor fan for gummed or clogged dirt in side.. that maybe the cause.. an over heating processor or a toasted gpu...do you own this laptop if so.. before a gpu die it displays symptoms like sudden hung.. blue screen of death or screen freezes but the mouse pointer moves.. that kind of thing.. try to look for shorted cap and hoping to find shorted one or if not.. the gpu is toasted..
                  Checked and could not see anything in the fan. Its my unit and did not see anything.

                  Comment

                  • cdgold3
                    Member
                    • May 2018
                    • 23
                    • Cleveland

                    #10
                    Re: Clevo n870hc / No boot

                    Originally posted by cdgold3
                    I removed cap c578, tested on bench and works fine removed
                    So I'm guessing I have a short on the gpu and cpu side as I get a connection to ground even on the CPU points on top.

                    What's the best way to test faulty caps without removing one side? Or is there no way without proper equipment?

                    I am just working my may thought the diagrams if anyone can point me to something else that may be causing it?

                    Would a dead gpu/CPU cause everything to ground?

                    Comment

                    • piernov
                      Super Moderator
                      • Jan 2016
                      • 4435
                      • France

                      #11
                      Re: Clevo n870hc / No boot

                      Measure exact resistance to ground. 6 ohms to ground on CPU VCore for Kaby Lake is perfectly fine. GPU VCore may be similar or even lower.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                      Comment

                      • cdgold3
                        Member
                        • May 2018
                        • 23
                        • Cleveland

                        #12
                        Re: Clevo n870hc / No boot

                        Originally posted by piernov
                        Measure exact resistance to ground. 6 ohms to ground on CPU VCore for Kaby Lake is perfectly fine. GPU VCore may be similar or even lower.
                        Hi piernov,

                        Is that with no power attached?

                        Comment

                        • cdgold3
                          Member
                          • May 2018
                          • 23
                          • Cleveland

                          #13
                          Re: Clevo n870hc / No boot

                          I have been working on finding 19v and 3.3v and they seem to be fine but i cant find the 5v rail.

                          Can anyone tell me if on page 84 the type-c, 5v should that be always live with ac connected?
                          Last edited by cdgold3; 07-08-2020, 03:44 PM.

                          Comment

                          • Techtiger
                            Badcaps Legend
                            • Oct 2014
                            • 1601
                            • france

                            #14
                            Re: Clevo n870hc / No boot

                            Check page 90 5V, 5VS, 3.3V, 3.3VS, 3.3VA if all voltage are available then follow the power sequence page 107 & feedback what’s missing

                            Comment

                            • cdgold3
                              Member
                              • May 2018
                              • 23
                              • Cleveland

                              #15
                              Re: Clevo n870hc / No boot

                              Originally posted by techtiger
                              Check page 90 5V, 5VS, 3.3V, 3.3VS, 3.3VA if all voltage are available then follow the power sequence page 107 & feedback what’s missing
                              Thanks tachtiger

                              v3.3
                              u31
                              --------
                              pin 1,2,6,7 - vdd3 - v3.3
                              pin 8,9 - 3.3vs - v0.00
                              pin 13,14 - 3.3v - v0.00

                              v5
                              u30
                              --------
                              pin 1,2,6,7 vdd5 - v0.00
                              pin 8,9 - 5vs - v0.00
                              pin 13,14 - 5v - v0.00

                              u26 - VA
                              --------
                              1 - 19.28v

                              So it does look like i have 5v is rail down. I have been looking at the type-c/usb 3.0 area as i can see a bit of what looks like liquid damage as U14 looks a bit crusty.
                              Last edited by cdgold3; 07-09-2020, 02:33 AM.

                              Comment

                              • Techtiger
                                Badcaps Legend
                                • Oct 2014
                                • 1601
                                • france

                                #16
                                Re: Clevo n870hc / No boot

                                Originally posted by cdgold3
                                Thanks tachtiger

                                v3.3
                                u31
                                --------
                                pin 1,2,6,7 - vdd3 - v3.3
                                pin 8,9 - 3.3vs - v0.00
                                pin 13,14 - 3.3v - v0.00

                                v5
                                u30
                                --------
                                pin 1,2,6,7 vdd5 - v0.00
                                pin 8,9 - 5vs - v0.00
                                pin 13,14 - 5v - v0.00

                                u26 - VA
                                --------
                                1 - 19.28v

                                So it does look like i have 5v is rail down. I have been looking at the type-c/usb 3.0 area as i can see a bit of what looks like liquid damage as U14 looks a bit crusty.
                                DD_ON# SUSB# missing trace it back U31 pin 8.9 5VS not 3VS

                                Comment

                                • cdgold3
                                  Member
                                  • May 2018
                                  • 23
                                  • Cleveland

                                  #17
                                  Re: Clevo n870hc / No boot

                                  Thanks tachtiger for all your help

                                  Getting there slowly

                                  Nothing from pin 4 on PQ42. just tracing DD_ON# & SUSB# now.
                                  Attached Files
                                  Last edited by cdgold3; 07-09-2020, 07:35 AM.

                                  Comment

                                  • Techtiger
                                    Badcaps Legend
                                    • Oct 2014
                                    • 1601
                                    • france

                                    #18
                                    Re: Clevo n870hc / No boot

                                    find out PJ501 jumper if its' soldered remove it & see if 5V is there or not if not check the resistance to gnd of both pads

                                    Comment

                                    • cdgold3
                                      Member
                                      • May 2018
                                      • 23
                                      • Cleveland

                                      #19
                                      Re: Clevo n870hc / No boot

                                      Originally posted by techtiger
                                      find out PJ501 jumper if its' soldered remove it & see if 5V is there or not if not check the resistance to gnd of both pads
                                      Removed and got about 0.65v and then it started to slowly drop on pins 1,2,6,7 - u31

                                      Comment

                                      • cdgold3
                                        Member
                                        • May 2018
                                        • 23
                                        • Cleveland

                                        #20
                                        Re: Clevo n870hc / No boot

                                        Pad on side of U31 - no resistance

                                        Pad other side - 1.191

                                        Comment

                                        Related Topics

                                        Collapse

                                        • privato89
                                          Nintendo Switch Oled HEG-001: Second-Stage Boot Failure
                                          by privato89
                                          Hello everyone,

                                          I'm facing an issue with a HEG-001 motherboard that is unable to complete the Second-Stage Boot. I'd like to start directly with my conclusion, which is the decision to replace the MAX77621AEWI chip, and understand if it could be a correct evaluation.

                                          Before I dive into the process that led me to this decision, I want to mention that I have a fully equipped lab where I can perform any kind of tests.

                                          Let's begin:

                                          Following some guides online, I tried to understand how the Boot phase of the Nintendo Switch works, and what are the...
                                          03-26-2024, 06:37 AM
                                        • BTubbs200
                                          Dell Latitude 5420: No charge, no boot; amber LED for as long as the power button is held.
                                          by BTubbs200
                                          Dell Latitude 5420 P137G
                                          Board model LA-K491P REV A01

                                          Laptop is stone dead and only reacts to the power button being held while the charger is plugged in, in which case a dim amber LED fades in and immediately fades out when I let go. Battery being plugged/unplugged does not change anything.
                                          CMOS battery was removed and reinstalled; no change.
                                          No shorts to ground have been identified on the board whilst probing the power rails in resistance mode. No visibly damaged components.
                                          No indication that the CPU is receiving power; CPU fan does not activate.
                                          Of...
                                          01-23-2025, 10:45 PM
                                        • hinisa
                                          Xiaomi router freezes at boot after re-capping
                                          by hinisa
                                          I'm using Xiaomi Router 4A gigabit edition as wireless repeater. It worked fine for 2 years or so, but last week, wireless started to disappear.

                                          When I unplug/replug the power, it was working fine for a day/half a day or so until it freezes again.

                                          After testing with different power supply adapters and concluding it wasn't the issue I finally opened the case and this was the situation:



                                          Anyway I proceed to clean up the mess and replace all caps but unfortunately it made the situation worse. Now router can't even boot, either it freezes during...
                                          07-08-2023, 05:58 AM
                                        • Luke Anders
                                          Lenovo Legion 5 (15ACH6H/17ACH6H) - Does not boot into any OS
                                          by Luke Anders
                                          Hi everyone,

                                          A few details about the laptop itself:

                                          Name: Lenovo Legion 5
                                          Model: 15ACH6H (according to its back cover details) / 17ACH6H (according to the BIOS Menu)
                                          BIOS Version: GKCN60WW
                                          EC Version: GKEC65WW
                                          Serial Number: PF39AQ7Z
                                          Board Model: NM-D562 Rev 3.0
                                          RAM: 16GB Installed, DDR4 (brand new)
                                          NVME: 500GB NVME drive (brand new, installed Windows 10 onto it for testing purposes and tested on another laptop (a dell XPS) works perfectly fine and boots in)

                                          I bought this laptop recently from eBay as a faulty device....
                                          10-12-2024, 05:13 AM
                                        • 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...
                                          10-24-2024, 06:36 PM
                                        • Loading...
                                        • No more items.
                                        Working...