HP Envy 15 cannot charge battery!

[Tuomo]

Re: HP Envy 15 cannot charge battery!

Ah yes, well the reason I thought that chip is okay is because it also controls a lot of other things like USB right? The laptop works absolutely fine, either running off battery or just with the adaptor plugged in, it just wont charge, and I cant have the battery in when running off the AC because of the cycling which I am sure is not good for it..

Also, I am not sure if it is a big problem, but the voltage from PR155 is 3.03V not 3.3V. It is 3.33V on the motherboard that will charge though!

Cheers

USB is controlled by South Bridge not EC. If you remove PR155 you can se if that cycling stopping. Then it is probaly EC chip failed.

Firt measure PU1 PIN23 should be 0V when chargin is OFF and PL6 0V. PIN23 control upper mosfet PQ15 and PIN 20 lower PQ13 make 12V from VIN 19.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

USB is controlled by South Bridge not EC. If you remove PR155 you can se if that cycling stopping. Then it is probaly EC chip failed.

Firt measure PU1 PIN23 should be 0V when chargin is OFF and PL6 0V. PIN23 control upper mosfet PQ15 and PIN 20 lower PQ13 make 12V from VIN 19.

Thanks a lot! I will look at it on Monday as I left the gear at work.

Cheers

[opamp]

Re: HP Envy 15 cannot charge battery!

okay, so whats my next move?

I think U33 getting hot is something new and something I have done.. with in seconds if i lick my finger and touch the top of it it will boil off the liquid, but before attempting to fix the second board I used the original one to charge my battery for a few hours at a time.

Thanks

I think you are going to need a new KBC ic if you decide to fix the old board, here's the link if you decice to order one.
http://www.ebay.com/itm/1PCS-New-ENE...item3a6b43792a

[grahamw01]

Re: HP Envy 15 cannot charge battery!

The old board? Well, the only thing I noticed is when the power button was pressed, the cmos chip got very hot.. (I think its the cmos? the one that looks like a gpu) that was the only difference when it was turned on. I do not know about U33 though..

[Tuomo]

Re: HP Envy 15 cannot charge battery!

The old board? Well, the only thing I noticed is when the power button was pressed, the cmos chip got very hot.. (I think its the cmos? the one that looks like a gpu) that was the only difference when it was turned on. I do not know about U33 though..

Very often Hot = Fail maybe internal short circuit.

If you want check old board.

1. +PRWSRC = 19V

2. PU9 PIN 7 LDO = 5V

That is good starting point.

[opamp]

Re: HP Envy 15 cannot charge battery!

PIN23 control upper mosfet PQ15 and PIN 20 lower PQ13 make 12V from VIN 19.

So how exactly does PQ13 make 12v from 19v???

[Tuomo]

Re: HP Envy 15 cannot charge battery!

So how exactly does PQ13 make 12v from 19v???

for detail how PWM work please use google.

if i referred wrong mosfet that case i am sorry.

PWM use 2 mosfet as regulator to make wanted voltages

[grahamw01]

Re: HP Envy 15 cannot charge battery!

I cant test PQ13 or PQ15 because I cant access the pins but I replaced them and still same story as always

[grahamw01]

Re: HP Envy 15 cannot charge battery!

removed PR155, STILL cycling!

[Tuomo]

Re: HP Envy 15 cannot charge battery!

removed PR155, STILL cycling!

Ok. Remove battery and check PL6 there should be 0V.

If there is voltage chargin is always ON state.

And put PR155 back into place.

[opamp]

Re: HP Envy 15 cannot charge battery!

Remove PQ13 and PQ15 and leave them off, now check pin 14 or PL6(which ever is easier) for voltage remember it has to be 0volts. If there's no voltage install battery and see if it charges.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

Ok. Remove battery and check PL6 there should be 0V.

If there is voltage chargin is always ON state.

And put PR155 back into place.

voltage across PL6 is 18.85V

[Tuomo]

Re: HP Envy 15 cannot charge battery!

voltage across PL6 is 18.85V

So chargin is always ON or 19V leak somewere elsewhere.

Opam excelent idea remove PQ15 and if there is voltage on PL6 it came +PRWSCR.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

I will give it a go in a 10 minutes, just waiting for the end of work!

Cheers guys

[grahamw01]

Re: HP Envy 15 cannot charge battery!

still 18.85V on PL6 and 19.5V on charge pins with PQ13 and PQ15 removed!

[Tuomo]

Re: HP Envy 15 cannot charge battery!

still 18.85V on PL6 and 19.5V on charge pins with PQ13 and PQ15 removed!

So voltages leaks from +PWRSCR. Lets cheking what way it came from.

Can you remove PL6 to be sure voltages not came from PU11 chip.

Then we have to remove choices what way it came.

[opamp]

Re: HP Envy 15 cannot charge battery!

PU11 pin 15 and 16 have to be 0volts. Get voltages on all pins on charging motherboard that way we know what's supposed to be high and whats low.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

okay I will try tomorrow, but the pins are very small, I was able to get the voltages on pins 2 and 14 because I followed the rails and found other bits to look at, but most of them I can't follow..

Anyway thank you both for your continuous support with this problem..

[opamp]

Re: HP Envy 15 cannot charge battery!

Ok also get voltages from the battery connector.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

i think if i remember them correctly they are all 3.3V but the last one is 19.5V