I suspect the PCH, and I don't know how to check it.

[Arkangelus]

I am inspecting an HP device, model 0PAD DA0PADMB8G0 REV: G, with processor i5-1035G1 and I suspect the issue with the PCH because, when connecting the original charger, there is no LED indicating detection, but the PCH gets slightly warm to the touch.

Measuring the coils near the processor, there is no short circuit. In voltage drop measurement, I get a reading of 0.107, and in ohms I get a reading of 134.2. On the 5V coils, I get OL, and the voltage drop measurement gives me 0.384. On the 3V coil, I also get OL, and the voltage drop measurement gives me 0.323.

This is the information I have so far, as I've been unable to find schematics or a boardview for this motherboard.


How can I confirm that the issue is indeed with the PCH? I’ve worked on devices where problems with the 3V line mean a definite PCH failure. However, this device doesn’t even have a short on the 19V line. Is there any test I can perform to determine if the PCH is faulty?

[reformatt]

PCH is not responsible for charge light, that's usually from the EC. Usual course for troubleshooting without schematic is locate the +3V converter IC and check the +3V LDO present or not.

[Arkangelus]

PCH is not responsible for charge light, that's usually from the EC. Usual course for troubleshooting without schematic is locate the +3V converter IC and check the +3V LDO present or not.

Thank you very much for responding, Reformatt. Yes, the +3V LDO is present, as well as the +5V LDO. What surprises me is that the PCH is getting a bit warm. I'm not sure if that's normal.

[mcplslg123]

PCH should'nt be warm in off condition. What is the consumption on dc supply?
Have you flashed clean me bios?

[Arkangelus]

PCH should'nt be warm in off condition. What is the consumption on dc supply?
Have you flashed clean me bios?

Thank you very much for your response. I'm unable to check the consumption because I don't have an HP connector tip for my power supply (although I do have a cable with that blue tip that could be used to connect it to my power supply).

Regarding your question about flashing, yes, I tried to clean the ME region of the BIOS, but I encountered a serious issue since my programmer is not able to erase/write on the XMC chip's BIOS. I searched here on the forum and found a post indicating that an equivalent model could be used on the programmer, and while it does recognize it, it doesn't fully read it. When trying to load a clean BIOS, it's unable to erase or even write.

[ianbak]

Do you have a thermal camera? You can usually spot a dead PCH because any heat tends to occur in a small spot, rather than uniformly

[Arkangelus]

Do you have a thermal camera? You can usually spot a dead PCH because any heat tends to occur in a small spot, rather than uniformly

Hi ianbak! Thanks for asking. No, I don't have a thermal camera. I just touched the PCH area and noticed a rise in temperature. What I did do is measure the coil that goes to the PCH, and it's not shorted. And that's strange.