Sephir0th
FairRepair
Last Activity: Today, 02:29 PM
Joined: 10-17-2020
Location: Apen, Lower Saxony
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Why is PU5102 present then and why do you mention it? From my understanding the only purpose of this IC ia to power on the GPU VRAM. -
For parts identification we need at the very least to know what is written on them, the "code".Leave a comment:
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If you want definitive answers, then you have choosen the wrong job.
this is the reason why it's usually not really economical to perform such tasks. For me it looks like still something wrong with the PCH but am I a absolutely sure? Not really, since it requires to rule out all the other possibilities why SLP_S4# is not deasserted, a very detailed visual inspection and maybe to know more about the board history.Leave a comment:
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This normally.means either bridged solder balls/bad PCH or BootGuard enabled. Bad luck i would say. Try to find a PCH without BootGuard being enabledLeave a comment:
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It's a partially fried chipset. Happens regularly. Possibly reason could be that something faulty was inserted in on of the slots but no clue unfortunately.
I wouldn't recommend voltage injection here since there is a decent chance that the chipset will blow up.Leave a comment:
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From what i have heard a possible workaround could be to change the value of RE77 to a lot higher resistance, e.g. 10 KiloOhms.
Try and report
Kudos to mcplslg123...Leave a comment:
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i would say, let's start with clear pictures of the Motherboard. Both sides. Can't be that hard to find the main SPI flash.Leave a comment:
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Could be a short circuit in the late sequence. More informations necessary about the power supplies coming on/not.coming on and also resistance measurements from.all secondary power supplies suggested.
How much current draws the board at max?Leave a comment:
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Agree with this one. Good find. Just want to add to pay attention get the 01 variant (Auto-Restart)...
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It's a clear short to GND of the Main power rail and the Bench top PSU should reveal it. Only question left is, whether it is a capacitor or a GPU/CPU related Mosfet/DrMOS. So don't exceed 1 Volts under any circumstances until the origin of the fault is clear or ruled CPU/GPU being ruled out.Leave a comment:
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Intel 5th gen CPUs work with FIVR ( Fully Integrated Voltage Regulator) design, so 1.8Volt for VCCIN is expected, same as with 11th gen CPUs.
Also the resistance to GND should be really high here compared to a "normal" Core value.
That these FIVR power supplies getting pretty hot till some extent is still normal and can only be used as a small indicator at max, not as a clue. More informations need to be collected as advised in previous Post already.Leave a comment:
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First row of the IC is barely readable. Please write the marking code out in Full.
Other than i am curious too what turns out when you finally remove that IC.Leave a comment:
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I think i have well explained already how the short circuit of VREG3 COULD have happened. Maybe you want to read that again. There is no clue though. Since it's just a assumption based on a mix of experience and knowing what circuits are affected. And the way to go, and in what order was explained too.
The missing voltage at The current sense resistor or what you call JP8801 is the exact reason why I do assume a additional issue in the charging circuit still, since even with a missing or shorted 3V LDO the main power rail should work.
tl;dr there is no direct correlation....Last edited by Sephir0th; 04-20-2025, 07:26 AM.Leave a comment:
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Which means, even your Main Power Rail is not present right now.
The floating track is most likely ACN or ACP, so for current sensing. If this track has touched another circuit, for example a 3.3V line, then it would explain what you are challenging right now.
At least a shorted 3V LDO and from what i read still something wrong around the charging controller, so multiple issues.
To blindly remove components is a very naive approach though. You need to inject voltage with a adjustable bench top power supply into this track. What is shorted will heat up then....Leave a comment:
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This looks almost completely "cold"
However, is the Main power rail present or not? The approach has almost no structure for some reason.Leave a comment:
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You need to understand why the Enable for PU5102 is not stable. DGPU_PWROK asserted will be one of the requirements for example.Leave a comment:
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As long as it isn't enough to replace the mentioned components to get the board working again, which is likely the case, you're not only oversimplifying the situation but also asking the wrong questions.
This really likely needs proper troubleshooting and for me there is no fun to see while looking at the big exposed area. Looks really bad and was supposed to be cleaned right after the incident.
Either way, first step is to clean the mess...Leave a comment:
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Most likely means, at least one of these three DrMOS is internal shorted.
If only the phase, you are measuring here, then it must be the DrMOS right next to the probe.Leave a comment:
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It should be clear that when a known good BIOS doesn solve the issue, then the fundamental assumption, on whatever it is based, is wrong or it has been solved already and something has happened while the repair attempt.
The only useful approach here is to get more informations about the board behaviour. Right now we have nothing.
Current consumption points to a big hang in the early power up sequence, including battery not charging. Most likely stuck between ON/OFF# / PM_PWRBTN or PM_SLP_S5#/S4#
tl;dr: Either you start to "really" dig in or, you...Leave a comment:
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This means, the charging controller kills this resistor continously. Only logical conclusion is that the charging controller is shorted which normally should have been noticed after a closer inspection of VCC and REGN. tl;dr Replace the charging controllerLeave a comment:
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