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Thursday, August 10, 2023

hp 15-bd003tx (BDL50 la-d704p) not power on

             Put DC supply amp. 3-5 
And press power button amp. 17-18
    Open this laptop 
                                 Vin is okk
3v 5v coil voltage okk
1.8 v okk
Check RAM voltage - no RAM voltage 
CHECK RTC SECTION working fine
   I thought check io chip requirment 
  Io chip all requirements ok(EC_RST,LID SWITCH, POWERBTN#,acin,.................)

RSM RST ✅
POWERBTNOUT# ✅

But IO can't receive SLP_S3#/ SLP_S4# SIGNAL
 NOW I CHECK 
                       3V TO 3V PRIM 👍
    1.8 V to 1.8 V prim 
          1.8 v prim input is ok
               Enable is ok (3v_pch )
               1.8 v output ok
       But not generate power_good 
    I found 100k resister is show high 

  I changed this resistor
   IO pin come voltage SLPS3#, SLP_S4# 
  The board trigger and give display