Re: Hp spectre 13. Charging issue. Very confusing!
Stupid question - check both ports under microscope. May be they have pins damage....
kostik78
Member
Last Activity: 09-01-2021, 09:55 AM
Joined: 01-16-2021
Location: San Ramon, CA
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Re: Hp spectre 13. Charging issue. Very confusing!
Well. I am not so expirenced but I believe that TS65* should negotiate 20v from the charger. There are no other components involved into the process. It may be it has a protection circuit and detects something. TI has datasheet on IC and demo board with the schematic available online. I would check the documents to see if there is description of how the negation works (it is protocol with messages exchange) and if IC has the protection that prevents the negation....Leave a comment:
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Re: Hp spectre 13. Charging issue. Very confusing!
TPS65982 responsible for detecting USB-C plug orientation and switch internally according to the plug. Also I suspect that power line on this laptop similar to another spectre and looking at its schematic, one TS65*(let's say A) is kinda controlling another TS (B) even when USB-C plug is not connected to A.
P.S. I have one spectre right now where both ICs don't talk to power supply to get 19v but there is no short. I ordered them from China and will replace. Something tells me that the board will...Leave a comment:
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Re: Hp spectre 13. Charging issue. Very confusing!
I bet this laptop uses TPS65982 for each port and they work together so it can explain this behavior. Also UBC-C is symmetrical but it is not mechanical symmetry, it is logical. IC does it. So I would say that one IC is “half-broken” (IC that controls port A from the scenario)Leave a comment:
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Re: Spectre x360 - no power
While waiting PU4 (BGA from China) I got two more same motherboards to fix with no-power issue and one for x360 with usb-c. Decided to share what I found - may be it will be useful for someone.
Board #2 - short on VA caused by EC34. The component looked visually fine but was shorted. After replacing the board works fine.
Board #3 - no power and no obvious short, DC-IN was missing on PQ8. Someone was there with crud tools and replaced PQ8 with another type of mosfet (I even couldn’t read the numbers but it was bigger) and...Last edited by kostik78; 02-03-2021, 12:40 AM.Leave a comment:
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Re: Spectre x360 - no power
I think PU4 done. Now the board even doesn’t have 3VCPU and 5VS5 that were working yesterday (even the battery was charging) I will buy a new one on eBay and try to replace it. Desodelirng,rebaling from the donerboard are too many steps to overheat the chip. I will update the thread after I replace PU4....Leave a comment:
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Re: Spectre x360 - no power
Investigate a bit more. When I press power button I see voltage jump on 3V (PQ15), so looks like It tries to enable. So something should be shorted and the protection kicks in. Not sure what to do next - inject 3V and see what starts heating up ?Last edited by kostik78; 01-23-2021, 12:14 AM.Leave a comment:
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Re: Spectre x360 - no powero
PL5:
Donerboard - 71 Om (older cpu)
The board - 50 Om
PL15:
Donerboard - 500 Om(red probe on ground), 1.3KOm(black on ground)
The board - 400 Om(red), 1.1KOm(black)
PL12:
Donerboard - 500 Om(red), OL(black)
The board - 500 Om(red), OL(black)...Leave a comment:
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Re: Spectre x360 - no powero
PQ4 is VCC_CORE and I don’t think it will affect VIN. I think your point is true for PQ6.
I removed PQ4 and PQ2. The low resistance between G-S on these mosfets (and others I specified above) exists only after an attempt to start the board after disconnecting the power-charger. And it lasts for a few minutes (like something keeps a charge that slowly goes away)
I don’t see any obvious shorts on “cold” board (except the case I described above). Only one strange thing is 400Om resistance between...Leave a comment:
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Re: Spectre x360 - no power
Oh...well. I replaced PQ8 and the motherboard came to life. I did a testing and everything was working fine (loosely installed in case with the screen). Touch, keyboard and etc.
After I assembled and during the second testing, I shorted accidentally something around V10(1.2V capacitors). I know I know
My bad.
So now I have non working board again but in different way.
If I connect powercharger 19V, VIN, 3VPCU, 5VS5 are good. Also I see V9(1.05VS5) which I am not sure right or wrong. Even the battery is charging....Last edited by kostik78; 01-21-2021, 11:20 PM.Leave a comment:
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Re: Spectre x360 - no power
Well... I decided to triple check 19v rail again and ... of course PQ8 is shorted (S-D). Not sure how I missed it multiple times. I believe I did checked
I don’t have it right now to replace and test. Same mosfet is shorted as well on my donerboard. So I guess I need to buy it. I will update the thread once I do it.Last edited by kostik78; 01-20-2021, 12:49 AM.Leave a comment:
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Re: Spectre x360 - no power
No short on PL6. PQ6, PQ7 & PQ28 are OL between legs (d,s,g)
PU1
3 - 17.8v
5 - 3.37v
6 - 2.76v
16 - 6.08v
20 - 18.9v
I suspect “hot” short (when voltage applied) on +VIN line. But I am not sure since +VIN is on PU1 (leg 19) and it has same voltage as from another thread. Any ideas ?
Thanks for helping me....Last edited by kostik78; 01-19-2021, 08:34 PM.Leave a comment:
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Re: Spectre x360 - no power
The battery is unplugged when I measure voltage.
I will check PU1 and rest tomorrow and update the thread. I don't have time to work on the board today....Leave a comment:
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Re: Spectre x360 - no power
No short PL10. PQ14 & PQ18 shows OL between D-S, G-S, G-D. Multimeter lowest is 400om
I still suspect +VIN ...It is only 0.87v. It seems to very low, right?...Leave a comment:
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Re: Spectre x360 - no power
Yes. 19v. The shorted cap was exactly there....Leave a comment:
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Spectre x360 - no power
I am trying to fix spectre x360 13. Laptop is exactly same as in [url]https://www.badcaps.net/forum/showthread.php?t=82397[/url] (same motherboard)
Something like ant shorted one cap on 19v around charging controller. I replaced the cap from donerboard (but it may be just removed since it's back filter).
The board is still dead: no power, lights. I didn't find any other shorts on the board, checked all caps.
I tracked down that 19v is reaching BQ24715 and mosfets close by . I checked voltages of BQ24715 using values from above thread. Everything looks... -
Re: New Members - please post your introductions here
Hello, everyone. I strongly believe into “right to repair” and I brought several devices (iPads, small electronics) back to life. Although I believe I am new in the repairs. I found this forum while trying to fix spectre x360 mother board. Thanks.Leave a comment:
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