Announcement

Collapse
No announcement yet.

X550jx black screen but cpu heating up

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #61
    Re: X550jx black screen but cpu heating up

    Provided 3.3v and no change.

    Comment


      #62
      Re: X550jx black screen but cpu heating up

      Put pq3002 and wait for oscilloscope

      Comment


        #63
        Re: X550jx black screen but cpu heating up

        Originally posted by stingerchamp View Post
        Put pq3002 and wait for oscilloscope
        X2001 has 32khz clock stabil sinus

        Comment


          #64
          Re: X550jx black screen but cpu heating up

          Check xtal crystal oscillator 14mhz or 25mhz
          If not ok then replace crystal

          Signal sequence ends at pltrst#

          It will not tell about BIOS

          Check Chip select pin1 of PCH bios , frequency generated or not

          If not then bios chip is dead

          Pin1,2,5,6 these pins have signals , check via oscilloscope



          If all ok then you have problem with gfx supply ,it should be present when CPU core and ram is ok

          1.8v generated ?

          in previous post you mentioned

          VDD=0.9v ???

          Comment


            #65
            Re: X550jx black screen but cpu heating up

            Originally posted by questore View Post
            X2001 has 32khz clock stabil sinus
            Found solution

            12vsus is missing that is why suspwrdnack is low

            After 26 step check at output at step26 1.5vspowergood

            Comment


              #66
              Re: X550jx black screen but cpu heating up

              Originally posted by stingerchamp View Post
              Found solution

              12vsus is missing that is why suspwrdnack is low

              After 26 step check at output at step26 1.5vspowergood
              - 12vsus is 12.98v and stabil
              - rechecked 3vsus_pwrgd = 3.09v (3vsus and its actualy 3.32v ) is this correct?

              Comment


                #67
                Re: X550jx black screen but cpu heating up

                Hmm interesting

                3vs power good tied to high logic or 3.3v then it is ok 3.3

                What is voltage on all pads of pq3002, check via boardview, list pad value

                Voltage is still available at pq3002?

                Suswarn# active only when any sus voltage is missing

                Suswarn# is active and coming from PCH


                Remove battery and check with adapter plugin only as if you see power sequence change with battery plugin DC mode

                Comment


                  #68
                  Re: X550jx black screen but cpu heating up

                  Originally posted by stingerchamp View Post
                  Hmm interesting

                  3vs power good tied to high logic or 3.3v then it is ok 3.3

                  What is voltage on all pads of pq3002, check via boardview, list pad value

                  Voltage is still available at pq3002?

                  Suswarn# active only when any sus voltage is missing


                  Suswarn# is active and coming from PCH


                  Remove battery and check with adapter plugin only as if you see power sequence change with battery plugin DC mode
                  - No suswarn found in PCH boardview

                  - pq3002 3.3v voltage is only found while AC plugin in and 3 led (power+capslock+numlock) are lit but when it turns of and turns on again with 2 led then NO pq3002 3.3v voltage found. pq3002 has only 16mv

                  - same voltages with AC and same with battery testing sequence
                  Last edited by questore; 01-02-2021, 08:31 AM.

                  Comment


                    #69
                    Re: X550jx black screen but cpu heating up

                    Suswarn# is suspowerdnack# check in schematic power sequence diagram

                    Pq3002 all pads value name and voltage it is 3pin

                    Pq3002 3.3 at first but then zero

                    Sus voltage is missing, without sus voltage laptop will not show display and if you check schematic power sequence diagram 12v is an input to three sus switch ICS



                    What do you mean turn off then on?

                    Comment


                      #70
                      Re: X550jx black screen but cpu heating up

                      Originally posted by stingerchamp View Post
                      Suswarn# is suspowerdnack# check in schematic power sequence diagram

                      Pq3002 all pads value name and voltage it is 3pin

                      Pq3002 3.3 at first but then zero

                      Sus voltage is missing, without sus voltage laptop will not show display and if you check schematic power sequence diagram 12v is an input to three sus switch ICS



                      What do you mean turn off then on?
                      - Pq3002:
                      pin 1 16mV
                      pin 3 16mV
                      pin 2 GND 0V

                      When I plug in the AC connector (no battery connected)
                      then the laptop starts by itself immediately with 3 led constant lights (power+capslock+numlock) [at this point the Suspwrdnack is 3.3v]
                      then after 3 second the laptop shuts down and starts again by itself (2 led lights constant power+capslock) [at this point the suspwrdnack is 0v and stays that way]

                      Comment


                        #71
                        Re: X550jx black screen but cpu heating up

                        Did you get oscilloscope?

                        If yes check 1.05 PCH supply , 5v,3v,12vs all supplies
                        Should not have ripple , should be clear DC line signal

                        Do not connect battery until laptop rectified
                        With help of board view check
                        All 12vs points which are available on board


                        Experiment

                        You have PCH_susack# 3.3v and stable?

                        With jumper wire or tweezers create connection between suspwrdnack and pch_susack# and then
                        Start laptop , do not remove jumper wire

                        Check voltage at suspwrdnack with jumper wire still available
                        If voltage stable you have issue at 1.2vs supply which is required for display out

                        If voltage drops PCH is dead

                        Thanks

                        Comment


                          #72
                          Re: X550jx black screen but cpu heating up

                          Originally posted by stingerchamp View Post
                          Did you get oscilloscope?

                          If yes check 1.05 PCH supply , 5v,3v,12vs all supplies
                          Should not have ripple , should be clear DC line signal

                          Do not connect battery until laptop rectified
                          With help of board view check
                          All 12vs points which are available on board


                          Experiment

                          You have PCH_susack# 3.3v and stable?

                          With jumper wire or tweezers create connection between suspwrdnack and pch_susack# and then
                          Start laptop , do not remove jumper wire

                          Check voltage at suspwrdnack with jumper wire still available
                          If voltage stable you have issue at 1.2vs supply which is required for display out

                          If voltage drops PCH is dead

                          Thanks
                          - Yes the oscilloscope arrived. I will check for ripples...

                          - Ok will check for 3.3 with jumper wire.

                          - 1.2vs can't be missing I think because my board is "type LDP" (link below) and does not have 1.2vs eletronics at all.
                          https://ae01.alicdn.com/kf/Hb447dceb...cM.jpg_q90.jpg

                          - Another idea: Can it be that I have flashed a "Type LVDS" BIOS and motherboard does not power on because it lacks 1.2vs?
                          Last edited by questore; 01-04-2021, 08:40 AM.

                          Comment


                            #73
                            Re: X550jx black screen but cpu heating up

                            It can be simple bios issue yes

                            First check DC signals and clock at crystal

                            Comment


                              #74
                              Re: X550jx black screen but cpu heating up

                              Originally posted by stingerchamp View Post
                              It can be simple bios issue yes

                              First check DC signals and clock at crystal
                              My oscilloscope can only measure tup untill 200Khz so i cannot check the 2 other crystal)

                              DC 3v, 5v, 12v are ok no big drops/rises or anything (checked for 15 seconds)
                              Last edited by questore; 01-08-2021, 10:03 AM.

                              Comment


                                #75
                                Re: X550jx black screen but cpu heating up

                                Flash good known normal bios

                                Comment


                                  #76
                                  Re: X550jx black screen but cpu heating up

                                  Done BIOS programming, no change

                                  Comment


                                    #77
                                    Re: X550jx black screen but cpu heating up

                                    Originally posted by questore View Post
                                    Done BIOS programming, no change
                                    Bios is probably bad because testclip is faulty. And now i cant even switch off by power button. Repeat and be back...

                                    Comment


                                      #78
                                      Re: X550jx black screen but cpu heating up

                                      Bios is corrupted. Some parts are not writeable and always 0.
                                      I order a new bios and hope for the best.

                                      back when reprogrammed new chip.

                                      Comment


                                        #79
                                        Re: X550jx black screen but cpu heating up

                                        further: ch341a BIOS writer was faulty, BIOS is good. Ordered a new ch341a programmer.

                                        Comment


                                          #80
                                          Re: X550jx black screen but cpu heating up

                                          Verified BIOS writen.
                                          Now the status leds after powering on the laptop are:
                                          power + numlock + capslock and they all steady lit (no flashing)

                                          Cannot power off anymore by holding the power button. (written the previous bios and still the same)

                                          with oscillator checked BIOS pin 1
                                          shows 2 waving with multimeter after starting. (assuming CPU loads bios info)

                                          No values are changed on any measured sequence points

                                          Removed both +NVDD colis. No change
                                          Problem persist.

                                          WHAT NOW?? HELP!

                                          Comment

                                          Working...
                                          X