Re: Yoga Slim 7i Carbon 13 power on, no display
Yes, it is. 8.7V on both sides of the coil. And I did some measurements on both high and low side Mosfet in resistance and diode mode. Both seem fine.
Maybe it has something to do with how the driver IC adjusts the output voltage, I myself don't know about this.
tienlk19
Member
Last Activity: 12-18-2023, 06:15 AM
Joined: 01-08-2020
Location: hcm
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Re: Yoga Slim 7i Carbon 13 power on, no display
I agree partly. If it was always 8.7V, then most likely the high side Mosfet is shorted. However, what I don't understand is why it is only 8.7V after the laptop Power up. When the laptop is off, the PCH voltage is quite normal, fluctuating around 1.05V....Leave a comment:
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Re: Yoga Slim 7i Carbon 13 power on, no display
Thanks for your reply and the information about the DMI region.
I think the BIOS is fine. After uploading the Clean ME BIOS, I extracted that BIOS again and realized the BIOS is still in "Configured" state instead of "Initialized" using ME Analyzer.
Then I did some measures while the laptop was powering up. It turns out that the PCH coil voltage while powered on is not 1.05V but 8.7V (the VIN). I guess that explains why the laptop got so hot, the fluctuating S5 1.05V and the "Configured"...Leave a comment:
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Yoga Slim 7i Carbon 13 power on, no display
Hi,
I have this laptop that powers on, all signal LEDs ok, the battery charges,the keyboard light is on, and the fan spins but nothing shows on screen.
I measured the coil voltages and resistance, all seems good. The CPU coil is only 3ohm but this is an 11th gen CPU so I think it's ok. All voltages are present though +1.05VALW line fluctuates a bit from 1.02V to 1.06V.
The CPU gets hot pretty fast after power on (both the CPU and PCH), to the point that without the heatsink, the system turns itself off only after a few seconds.
I backup the BIOS, Clean ME, replace the... -
Re: HP Omen 15 - Short on GPU side but only draw <2W
Just another piece of information. From the laptop SSD, I found out that the previous owner used the laptop for cryptocurrency mining. The more reason to believe that the GPU is dead.Leave a comment:
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Re: HP Omen 15 - Short on GPU side but only draw <2W
I injected 1V though with the short in current control mode, the board only drew 0.35V 10A.
The laptop power led lights up when plugged in after removing the coils as I said in the first post. The laptop won't boot though. To convert this laptop to UMA I would need a schematic with is not available for this board.
The board number is DAG3aambaf0 if you want to look for images. It's not only 1 coil. I need to remove all 3 coils for GPU.Leave a comment:
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Re: HP Omen 15 - Short on GPU side but only draw <2W
I figured it out. The low Amps are due to the resistance of the probes of the power supply. I replaced the probes with thick copper wires and was able to push the board to 10A. Unfortunately, the only component getting warm is GPU so I can only guess it's a dead GPU.Leave a comment:
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Re: HP Omen 15 - Short on GPU side but only draw <2W
Hi steve,
Thanks for your reply. I'm not really sure I understand you correctly but I did remove the coil for GPU and confirmed the short is on GPU side. There is no problem on the MOSFET side or the MOSFET controller. The low resistance of 0.1ohms is from the GPU side with or without the coil. I understand the ohms law but in this case, it doesn't make sense when with 1V and 0.1ohms, you would expect around 10Amps (not to take into account the resistance of the multimeter itself so the real resistance of the GPU...Leave a comment:
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HP Omen 15 - Short on GPU side but only draw <2W
Hi there,
I have this HP Omen 15 (GTX 1050) with a shorted GPU. GPU coil resistance 0.1 ohms in continuity mode with 0.001V drop in diode mode.
I then desoldered the coil and confirmed the short is on GPU side. (Without the GPU coil, the laptop power led lights up when plugged in)
I injected 1V to find the short and to my surprise, the board only consumed 1.8Amps (My power supply can provide 10A max) and nothing got hot.
At this point, I am lost. There should be a short somewhere on GPU side but how can it only draw less than 2W? -
Re: DELL XPS 9550 bios dumps
Never mind. It did work. I didn't detach the CMOS battery. Unplug it and let the laptop restart a few times do the trick. The DMI info lies in the padding of the BIOS region....Leave a comment:
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Re: DELL XPS 9550 bios dumps
Hi. My 9550 powers on but has a black screen though it can go to display test mode (power on + d). I tried to clean ME and reflash the bios but it did not work. Can anyone help me with the bios? And if possible, can you explain briefly how to fix the bios while keeping the system serial and keys? Thanks...Leave a comment:
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Re: Remove_SMM... UEFI.
I follow the thread and was able to unlock my Lenovo Thinkpad Yoga 11e 3rd gen. So here the files. Maybe could be useful to someone.
11e3rd_BIOS1.01PasswordRemoval.bin is for removing BIOS supervisor password
11e3rd_BIOS1.22 made from FL1 Lenovo BIOS is for flashing after removing the password (or you can use your own dump)Last edited by SMDFlea; 04-01-2023, 07:27 AM.Leave a comment:
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