HP Probook 450 G4 dead.

[warsztat]

Hello, laptop HP Probook 450 G4, board DA0X83MB6H0, I5, dead.

Board



Measure bottom side



Measurement to the ground.

Question : dead processor i5 ?
If plug power converters inductors 1R0 and 3R3 (0,1ohm and 0,3ohm) very hot after reset battery cmos.

[piernov]

Re: HP Probook 450 G4 dead.

Inject 1V on any of the inductors with 0.1 ohm or 0.3 ohm to ground and check if PCH (small die on CPU package) heats up.

[warsztat]

Re: HP Probook 450 G4 dead.

Meansure socket battery cmos - 8kohm, ic degradation. I5-7200U sr342, is there any place where you can buy sr342 at a profitable price?
it can be replaced with I3 ?

[warsztat]

Re: HP Probook 450 G4 dead.

I made a measurement in the battery socket (sorry y english, i still learning)

[Madhusha]

Re: HP Probook 450 G4 dead.

did any one have solution for PCH short?

[mcplslg123]

Re: HP Probook 450 G4 dead.

Replace it baby. No other option.

[reformatt]

Re: HP Probook 450 G4 dead.

Working on a HP 470 G4 with the same board (DA0X83MB6H0). A quick run around the coils showed 100 ohm to deck on +3VPCU. Anything that low is usually cause for alarm but I went through the basics.

RTC clock was present, PWR_BTN_OUT# goes low ok to PCH from EC (when power button is pressed), other pre-requisites all check out, including supplies to the PCH. No change to SLP_S5#_3R or SLP_S4#_3R, PCH_SLP_SUS# also no change. No activity other than random pulses on the 24Mhz clock for the PCH, but not sure if it comes up after S5.

Deemed a dead PCH as nothing else left. Unfortunate as the board was in excellent condition and discrete graphics as well.