Dell 3558 (la-b843p), 4th/5th genration board Prblm - on/off ( tripping issue)

Dell 3558 (la-b843p), 4th/5th genration board

 Prblm - on/off ( tripping issue)

          Open tha laptop and che ck all section voltage (check all voltages in ON condition 🔛)

 Vin 🆗

3v /5v 👍

Ram voltage 🆗

1.05v pch supply 👌

But, 

       No core voltage 

    👉 VR_ON enable signal not genrate

   

  I know, 

              4th/5th genration board VR_ON signal generate SOC (output)

      When,

                 SOC requirment full 

                                (Vccst_pwrgood)

 Then, 

           SOC release VR_ON enable signal core IC

         Check back trace 

          Vccst_pwrgd signal R707(100k) RESISTER inside voltage ok but no outside voltage 

    👉Change resister VR_ON 🆗

   but board not proper ON

   🔙 io chip requirment (NPCE 285)

     SYS_PWROK (3.3V) ✅

      ALL_SYS_PWRGD (3.3V)👍

        PCH_PWROK (NO VOLTAGE)😔

              & beep ground

       

      After all, 

    I check core IC voltage (ISL95813)

      All voltage ok

          Vr_on (1.5v)✅

          Vcc voltage 5v but show (2.5v)

                                         (S5- s0 state)

   5v s5- 5v s0 convert by IC (U3601)

     INPUT 5V 👍

    OUTPUT 2.5V (✖️)

        Find one capicitor (c3603) leakage 

      Its remove ,

     Board is proper ON and give core IC vcc pin 5v 👍👍 & DISPLAY COME