Re: HP ENVY 17 Motherboard Short help please
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Re: HP ENVY 17 Motherboard Short help please
See attached.
with care, lift up one leg (not yours) of PL16. This is to isolate the power supply and the consumer side (CPU / PCH).
After you have done this, meter in resistance mode -> check the resistance to ground of this PL16 but at the PCB PADS.
Which side of the PCB PADS has the short ?
Is it the producer (PU10) side ?
Is it the consumer (CPU/PCH) side ?Attached FilesComment
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Re: HP ENVY 17 Motherboard Short help please
Is the 3VPCU shorted ?
That is created by PU11, pin # 5 = LDO.
Is PU11 still on the board ?Comment
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Re: HP ENVY 17 Motherboard Short help please
Which one ? Is it PL18 ?3v inductor also shortedComment
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Re: HP ENVY 17 Motherboard Short help please
Is PL21 lifted on one leg or soldered in ?
Lift on one leg to confirm which side is shorted.Comment
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Re: HP ENVY 17 Motherboard Short help please
Its soldered in. I will try to lift one leg and check in the morning. however I have a question.
please don't laugh. It just a thought.
according to schematics Inductor connects to SW pin. not to the vOut pin. So when we lift inductor leg up, is that enough
I thought we should release vOut pin. May be Im wrong. please correct.Comment
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Re: HP ENVY 17 Motherboard Short help please
We are only trying to isolate the blocks on the logic board. Yes, lifting the single coil is ok.
Suspecting that the IC @ PU11 is defective. Not sure about the CPU but it may be ok or defective. As noted in other threads, we thought we had a dead CPU with 0.9 to 1.0 ohms but the unit was working fine. Just a FYI.
Not sure about your case.Comment
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Re: HP ENVY 17 Motherboard Short help please
I know that we may get flamed for trying but if you shorted the +3VPCU to ground then you shunted this power rail down, not spiked it to a higher potential. That is my understanding of what transpired on your desk. That is, this regulator would possibly get hurt. So perhaps some hope. If the 1.05 volt rail got hit by something higher, then it is game over for this CPU/PCH.
If you are comfortable with it, consider to flux and remove this regulator. Believe it is a QFN (quad flat pack package) which are not that bad to rework.Comment
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Re: HP ENVY 17 Motherboard Short help please
I will remove it. I will need some time because Im away from the motherboard. will do and give you an update soonComment
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Re: HP ENVY 17 Motherboard Short help please
For sure, replace PU11.
The cpu resistance looks too low for it to be ok but proceed to replace PU11 to test again at your discretion.
AliExpress should have these. You may want to order spare mosfets to replace the dcin mosfets. The same store should be able to source them as well.
Find a store with a high score to purchase the above.Comment
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Re: HP ENVY 17 Motherboard Short help please
That sounds great. let me try to find out the 3v regulatorComment
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Re: HP ENVY 17 Motherboard Short help please
Is it worth wasting time on this project as SOC is definitely dead at 0.1 Ohms.Comment
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Re: HP ENVY 17 Motherboard Short help please
Today I received the 3v step down regulator and I soldered it and tested. But unfortunately its heating within few seconds. May I ignore this project or continue? Whats your thoughts?Comment
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Re: HP ENVY 17 Motherboard Short help please
It was already said many times that the PCH, among a bunch of other components, is dead.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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this machine came to me as DOA and immediately found the issue as a 12v short to ground. Is it okay to inject voltage into that rail or does it have a potential path to the cpu or something? -
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