Announcement

Collapse
No announcement yet.

LENOVO 320 turns on lights present cpu not spinning

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

    LENOVO 320 turns on lights present cpu not spinning

    I need help on this LENOVO IDEAPAD 320 DG425/DG525/DG725 NM-B321 Rev:1.0.The problem is turns on lights on the power button is present cpu is not spinning and no display, already tried reflashed with good bios and ec here in this forum but still same issue. i have attached the phone on the measurement of shorted coil and cap resistance coil is PL2202 and PL1401 and the cap is PC2251 I Dont have a schematic for this . anyone could help me solve this problem please
    Attached Files

    #2
    Re: LENOVO 320 turns on lights present cpu not spinning

    Both the coil resistance is fine. Coils on CPU/GPU are supposed to show low resistance.

    Comment


      #3
      Re: LENOVO 320 turns on lights present cpu not spinning

      cpu here is cold but turns on and the fan is not spinnng

      Comment


        #4
        Re: LENOVO 320 turns on lights present cpu not spinning

        I pulled up the possitive side of this cap becasue it goes to ground even i pulled up and back in it goes to ground does this short?
        Attached Files

        Comment


          #5
          Re: LENOVO 320 turns on lights present cpu not spinning

          If the cap was shorted, coil will also shorted to gnd.Since you measured 0.04K resistance, so cap was simply not shorted. It may have shorted now 'coz you applied heat to remove it. These sort of caps has a tendency to go short when heated-so you should replace it. You are simply getting lost in trobleshooting it. When laptop is turned on, try to measure voltage on all coils and see which rail(s) is not rising and focus on that part.

          Comment


            #6
            Re: LENOVO 320 turns on lights present cpu not spinning

            Better replace it with 330uf tantalum cap.

            Comment


              #7
              Re: LENOVO 320 turns on lights present cpu not spinning

              @mclpslg123 , I have attached a photo the voltages on that area
              Attached Files

              Comment


                #8
                Re: LENOVO 320 turns on lights present cpu not spinning

                Your problem is Vcore missing. What is the resistance on Pch Power coil(mostl likely the coil marked as 4R7 near batt connector. You need to check whether +3VS & +5VS is generated or not.

                Comment


                  #9
                  Re: LENOVO 320 turns on lights present cpu not spinning

                  resistance of the coil which mark 4r7 both sides have 17.99k when measuring it show 17.99 the goes to 0l both sides

                  Comment


                    #10
                    Re: LENOVO 320 turns on lights present cpu not spinning

                    and the coil 4r7 has a voltage of 8.4v both sides

                    Comment


                      #11
                      Re: LENOVO 320 turns on lights present cpu not spinning

                      Then it is likely charging coil and not pch power.

                      Comment


                        #12
                        Re: LENOVO 320 turns on lights present cpu not spinning

                        You should check the basic signals like S5_ON,S4/S3_on, Sus,VR_ON,All sys pwrgood,pch power ok, ec rst Dram rst etc.

                        Comment


                          #13
                          Re: LENOVO 320 turns on lights present cpu not spinning

                          @mcplslg123 i cannot find schematic on this attach photo near gpu coils measurement
                          Attached Files

                          Comment


                            #14
                            Re: LENOVO 320 turns on lights present cpu not spinning

                            Which is your boardnumber?

                            Comment


                              #15
                              Re: LENOVO 320 turns on lights present cpu not spinning

                              Try this:
                              https://www.badcaps.net/forum/showth...80#post1217080
                              Last edited by Vesko356; 05-01-2023, 09:13 AM. Reason: Attached schematic removed and replaced with link.

                              Comment


                                #16
                                Re: LENOVO 320 turns on lights present cpu not spinning

                                Thanks @stevedb for the schematics. @mulong2019, since you have schematic, start measuring voltage .

                                Comment


                                  #17
                                  Re: LENOVO 320 turns on lights present cpu not spinning

                                  No problem

                                  Comment


                                    #18
                                    Re: LENOVO 320 turns on lights present cpu not spinning

                                    Did you find the problem?

                                    Comment


                                      #19
                                      Re: LENOVO 320 turns on lights present cpu not spinning

                                      Did you find the problem? i have same problem

                                      Comment

                                      Working...
                                      X