HP Envy 15 cannot charge battery!

[grahamw01]

Re: HP Envy 15 cannot charge battery!

by the way, not sure what this means but the resistance between charge pin 1 and ground is 20Mohms on the new board and 10kohms on the original

[Tuomo]

Re: HP Envy 15 cannot charge battery!

oops okay, good board bad charge: PL5 is 17.5 ohms, pl3 is 28kohms, pl6 is 8Mohms

bad board good charge: pl5 is 6 ohms, pl6 is 11 Mohms, pl3 is 16 Mohms

I don't really understand what I am doing, the values constantly change, why is that?

Make sure that the ground remains stable. You can use metal case of board.

The idea is that, if for example, PL3 resistance is very low mean leakage current to the ground.

Trying to move forward in order. First checked with the VIN input.

Measure resistance of PL7 and PL8 if resistance is very low there is shortage.

[Tuomo]

Re: HP Envy 15 cannot charge battery!

i forgot say AC OFF.

[Tuomo]

Re: HP Envy 15 cannot charge battery!

I tried reflowing it a few times it didnt help, I don't know what you refer to with NBSWON, and other things like DNBSWON, SUSB, SUSC etc..

We can measure those signals from U33.

If you like we can investigate both the system board in parallel.

Bad charge board.

PQ13 and PQ15 also PQ10 you can remove those, if you are think they are cause problems.

Put remember mark them firts before remove them.

Powering up, it is essential that some of the operating voltages are there.

1. VIN = 19V this have to work first.

2. 3V ALWS and 5V ALWS without those nothing work.

Good charge board those are OK.

So this board we can go futher if you like?

Bad charge board we have to find short circuit before proceed.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

We can measure those signals from U33.

If you like we can investigate both the system board in parallel.

Bad charge board.

PQ13 and PQ15 you can remove those, if you are think they are cause problems.

Put remember mark them firts before remove them.

PL7 and PL8 resistances are 220kohms on the original board and 115kohms on the new one.

Why do I need to mark them, I thought they were the same? I think I did swap them over when replacing them..

I cannot put the probes on single pins on U33, they are too small, it would be impossible not to short circuit..

[Tuomo]

Re: HP Envy 15 cannot charge battery!

PL7 and PL8 resistances are 220kohms on the original board and 115kohms on the new one.

Why do I need to mark them, I thought they were the same? I think I did swap them over when replacing them..

I cannot put the probes on single pins on U33, they are too small, it would be impossible not to short circuit..

Marking is good idea anyway. Always when removing parts mark them.

U33 I will come back to this a little later. I try find way to test signals.

PL7,PL8 not short, so need different test.

VIN 19 have to get working firts. AC ON and check PD4 or PC47 voltage.

-------------------------------------------

I looked NBSWON can it be measured CN8 PIN1 or C138 ?

If you can measure this press Power Button NBSWON should go 3.3V -> 0V -> 3.3V.

This is Power ON signal.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

Marking is good idea anyway. Always when removing parts mark them.

U33 I will come back to this a little later. I try find way to test signals.

PL7,PL8 not short, so need different test.

VIN 19 have to get working firts. AC ON and check PD4 or PC47 voltage.

-------------------------------------------

I looked NBSWON can it be measured CN8 PIN1 or C138 ?

If you can measure this press Power Button NBSWON should go 3.3V -> 0V -> 3.3V.

This is Power ON signal.

Is PD4 the a 10 pin IC or the big voltage regulator thing? PC47 is 19.4V, if PD4 is the voltage regulator it is 6V, if it is the 10 pin chip it is ~mV

I will try NBSWON

[Tuomo]

Re: HP Envy 15 cannot charge battery!

Is PD4 the a 10 pin IC or the big voltage regulator thing? PC47 is 19.4V, if PD4 is the voltage regulator it is 6V, if it is the 10 pin chip it is ~mV

I will try NBSWON

Never mind PD4

PC47 19.4V is enough for us by now.

Next look if VIN OK in PC43 should be 19.4V.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

there is only 5mV on cn8 pin 1, when i press the button it momentarily jumps to 20mV and back down

[Tuomo]

Re: HP Envy 15 cannot charge battery!

there is only 5mV on cn8 pin 1, when i press the button it momentarily jumps to 20mV and back down

Which board is that?

This should be 3.3V Good Charge board.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

Never mind PD4

PC47 19.4V is enough for us by now.

Next look if VIN OK in PC43 should be 19.4V.

PC43 is 6V on 1 side, 20mV on the other

[grahamw01]

Re: HP Envy 15 cannot charge battery!

Which board is that?

This should be 3.3V Good Charge board.

oooh, im checking bad charge board!

[grahamw01]

Re: HP Envy 15 cannot charge battery!

If I try to measure CH8 pin1 on old board, charging light goes from white to flashing orange when i touch it with the probe.. I am not short circuiting it

[grahamw01]

Re: HP Envy 15 cannot charge battery!

Okay, the old board just has constant flashing orange light now! not sure why..

[Tuomo]

Re: HP Envy 15 cannot charge battery!

PC43 is 6V on 1 side, 20mV on the other

Ok. There is no VIN voltage anymore.

Check PR12, PR13 and PQ14.

PQ14 should be CLOSED at VIN voltage can go to +PWRSRC.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

I think there is definitely a problem with U33, its almost like it is loose, if i press on it the light goes white, if i let go it flashes orange.. and it burns my finger to press on it lol

[Tuomo]

Re: HP Envy 15 cannot charge battery!

I think there is definitely a problem with U33, its almost like it is loose, if i press on it the light goes white, if i let go it flashes orange.. and it burns my finger to press on it lol

I agree, can you reflow this chip.

[grahamw01]

Re: HP Envy 15 cannot charge battery!

oops, ignore me, the base is shorting out on the case because i took the plastic off the bottom of the motherboard

[grahamw01]

Re: HP Envy 15 cannot charge battery!

I insulated the base and its not going orange now, god i am an idiot! anyway, on the old board pin 1 CH8 is always -120mV

[Tuomo]

Re: HP Envy 15 cannot charge battery!

I insulated the base and its not going orange now, god i am an idiot! anyway, on the old board pin 1 CH8 is always -120mV

You can check PIN8 for sure cause shematics has different marking.

If there is no 3.3V it means at U33 not work correctly.

This case that has to recheck different place to be absolutely sure.