I have laptop which recently started giving problems. It could not be powered on battery anymore (although I think the battery is not completely discharged) and also powering with the charging device (gives 19.5v) does not work. After a while some smelly smoke came out of the board. I've openend the laptop and it appeared that especially one component had stains of overheating. As it is impossible to read the text on the component (I guess it's a mosfet) I'd like to know if there is someone who has a detailed image of this board or could advise which component it is and has the specs of the component....

This specification for the HP ProBook 470 G4 + VH240a Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 + VH240a boardview and 470 G4 + VH240a schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or...

This specification for the HP ProBook 470 G4 + VH240a Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 + VH240a boardview and 470 G4 + VH240a schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or...

This specification for the HP ProBook 470 G4 + VH240a Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 + VH240a boardview and 470 G4 + VH240a schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or...

This specification for the HP ProBook 470 G4 + VH240a Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 + VH240a boardview and 470 G4 + VH240a schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or...

This specification for the HP ProBook 470 G4 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 boardview and 470 G4 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 470...

This specification for the HP ProBook 470 G4 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 boardview and 470 G4 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 470...

This specification for the HP ProBook 470 G4 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 boardview and 470 G4 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 470...

This specification for the HP ProBook 470 G4 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 boardview and 470 G4 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 470...

This specification for the HP ProBook 470 G4 Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the 470 G4 boardview and 470 G4 schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that any specification, datasheet, or download for HP ProBook 470...

Looking for some help with this one if anybody can assist please? I have an HP Probook 470 G4 Laptop which recently started to intermittently failing to turn on, with intermittent white LED light(charging LED) by the charging port when it should have been charging and showing an orange LED instead. Definitely some sort of gradual failure. Now the laptop fails to power on at all, no charging LED, no Power Button LED either - seemingly dead.
Stripped down to the bare motherboard. The original HP battery, when disconnected from the motherboard, is reading 0.00v - possibly some sort of protection...

Re: HP Probook 470 G4 - Power and Charging Problem

Yes it is the end of the attempt. At least for technicians without experience in BGA replacing and without decent tools.

In reality all the Youtube nonsense and scam about the "easy repairs" does not work anymore more most of the time. As already shared, the sad reality is, a dead BGA is one of the most common outcomes which you always need to have in your mind. Often also very hard to diagnose, because a BGA can fail without obvious signs like a shorted Power rail. The diagnostics part can be way worse...

Re: HP Probook 470 G4 - Power and Charging Problem

OK thanks. I've removed the heatsink, increased the voltage to 2v and yes, the PCH area does start to get a little warm, up to around 39 degrees. The amps draw goes up to 1.80 Amps and fluctuates around there. No more hissing noise from the power supply this time.

Does this confirm game over for this particular board? If so that's a shame, being my first ever attempt, however I know a fair bit more about laptop boards in general and their workings, than I did when I started - so not a total loss. Perhaps a tricky board...

Re: HP Probook 470 G4 - Power and Charging Problem

This result means you have to remove the heatsink and raise voltage to 2Volts. I'm sure you'll feel something after a while.

Re: HP Probook 470 G4 - Power and Charging Problem

Thanks for explaining. OK so I set the max current on my power supply to 3A, and set the voltage to 1v. Ground lead to board ground, and positive lead onto the inductor PL37.

I can hear a slight 'hissing' form my power supply, and the current draw shows as 840mA - nothing seems to get hot though, checking various inductors by feel, as well as the heatsink above where the PCH is.

Are you able to help explain what this result means please? I do have some 'freeze spray' as well as some IPA if it helps to...

Re: HP Probook 470 G4 - Power and Charging Problem



Yeah, Chip-Level isn't kindergarden and it needs months till you reach a somehow acceptable success rate, also depending on how fast you learn and the sources you learn from.

Confirm, the Inductor is linked to the Controller as assumed, then you can inject into the inductor directly.

But don't expect miracles. A dead PCH/CPU/GPU are common outcomes with recent devices.

"Thanks. Before I started with the troubleshooting I did a visual inspection of the board for any signs...

Re: HP Probook 470 G4 - Power and Charging Problem

The mosfet testing was simply because it was something else I thought I could check in the meantime, while looking at the shorted 3.3V rails.
This is my first ever board repair attempt, so I am learning as I go, with practically no experience in this field. Which is why I am probably checking things that are a waste of time at this stage, as it's all a learning experience.

Regarding the voltage injection - is there a 'best' place to inject the voltage on this rail, or can it literally be anywhere on the 3.3V...

Re: HP Probook 470 G4 - Power and Charging Problem

The "burned" Inductor is really near to the RT6575A, your 3V/5V Controller. So yes, if the Inductor has continuity with Pin8 then it is at least one of your shorted 3.3V rails. A shorted +3V_RTC in addition is already worse. And actually I don't understand from where the idea comes to still play with the Mosfets.
There are already many indications leading to a dead Platform Controller Hub. So just clarify the questions above, inject and see whether the PCH is getting hot to finally come to an end here.

Re: HP Probook 470 G4 - Power and Charging Problem

Just to clarify, as I didn't format my above post very clearly - results of testing the 2 mosfets near the inductor PL37:

[B]Mosfet PQ46[/B] is a 7752 GA7S2D N CHANNEL. The Drain of this mosfet connects to pin 1 of the PL37 inductor.

This mosfet reads 0.004v on diode mode between source and drain both ways (both polarities of test leads), and 1.6 Ohms across in resistance mode.
Also, on diode mode and resistance readings between gate pin and both the source and the drain (with lead polarities...

Re: HP Probook 470 G4 - Power and Charging Problem



Thanks. Before I started with the troubleshooting I did a visual inspection of the board for any signs of burn damage - using a loupe - and could not see anything at all. I did not however take any readings of any of the inductors - is this normally a good first step in these cases, or as a matter of course? If so, what readings should I have been looking for when checking the inductors?

I will do some test with the 1v injection on the +3V rail like you suggest and report back. In the meantime, I have...

Re: HP Probook 470 G4 - Power and Charging Problem

Well, 3V_DEEP_SUS shorted to GND. This likely means it is a no fix, but let's check first. Inject 1V up to 3 Amps into this rail and see whether the PCH is getting warm/hot.

A short inspection of all inductors present on your board would have made it clear in seconds, but Well. Now it is too late anyway. So let's go into the final round...

Re: HP Probook 470 G4 - Power and Charging Problem

Resistance between any of the +3v caps and GND is 0.6 Ohms.

I forgot to mention that throughout this whole time, even with the new DC IN cable, I have not once had the LED on the DC IN Jack light up. Only the white LED on the power button yesterday. I believe the jack LED should light up amber when the battery is present and charging, but it should light up white to show the charger is present/providing voltage I believe.

Re: HP Probook 470 G4 - Power and Charging Problem

Trying a different approach this morning. Removed the laptop charger and power button, and applied power at the charging port with my bench power supply - at the same entry point as the charger would provide the 19v so as not to introduce any voltage after any of the initial components on the board. There appears to be a minor fluctuation in amps, only 10mA comes and goes back to 0 every second or so, no change in the 19v. I'm not sure if this indicates that there isn't a short or not, but thought it might be worth ruling out any...

Re: HP Probook 470 G4 - Power and Charging Problem

OK so new HP DC IN connector/jack arrived today, and fitted it straight away. Initially I thought great, I couldn't get the voltage to fluctuate/drop like I was getting with the old DC IN connector. Things seemed stable on the 19v power rail. I plugged the fan back in, and still getting the 19v power rail at PR237.

I plugged the power button back into the board so I could try power it up. The small white led on the power button board started flashing - in time with the clicking noise from the board, for 8 clicks/flashes,...

Re: HP Probook 470 G4 - Power and Charging Problem

OK another update, with, what I think is good news.

Set up the meter again this morning, after changing nothing since yesterday. Plugged the charger in. Straight away, I'm getting the 19v power rail present on both mosfets, and around 25v on the gates!

The board hasn't moved position since testing yesterday. I kept the +ve meter probe on the PR237 leg as it's an easy test point to maintain, and gently started moving the DC IN port/cable around, like I was doing yesterday. After a few minutes of trying to...