HP Probook 470 G4 - Power and Charging Problem

[Sephir0th]

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.

[Scoff]

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 to start off with, or maybe there was somehow an error on my part while troubleshooting. Perhaps there was an issue with the 19v power rail initially, which replacement of the mosfet corrected, but there were other faults beyond this.

I want to say thanks to everyone that contributed to this thread - it was a bit help in getting to this point.

[Sephir0th]

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

I can't tell exactly but if I remember correct it needed 10 chip-level attempts to my first successful repair.

So this is normal. If you have to spend your own money then you have to expect to loose it with your first attempts. So regarding this, think about how much money you want to spent, what sort of devices you want to source.

Unfortunately, remotely it is impossible to tell whether you did something wrong or not. You need to find out by yourself.

Personally I do always advise to check the whole board like explained before for other issues before starting with the "real"work, otherwise you'll not only loose money but also time.

Regards