So I found the issue: UV1 on the back of the motherboard for determining the GPU had been sheared off, so the GPU was powered but not detected; replacing the logic gate with one from a donor board fixed the issue. There also seemed to be a loose capacitor on the back of the motherboard near the GPU vcore area.
Also, to answer the resistance question for anyone in the future, it looks like 0.76 ohms on a laptop RTX 4070 vcore is within spec.
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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4070 Laptop Vcore Resistance?
Can anyone with a functioning 4070 laptop check to see the resistance from vcore to ground? I've got an XPS 9530 that does not detect the NVidia gpu and the vcore that seems shorted, but also boots up which is throwing me off. The chokes around the GPU are sitting near 60C at idle.
Cant tell if this is a shorted component or fried GPU. I didn't see any mosfets hotter or colder than the others. GPU die doesn't seem to heat up much without a heatsink.
[ATTACH=JSON]{"data-align":"none","data-attachmentid":"3205960","data-size":"medium"}[/ATTACH]...
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Did you ever figure out the issue? I had identical symptoms, flashing the bios with a donor allowed the device to boot, but also seemed to break the Intel ME and both USB-C Ports. I am able to boot the system to Linux via the microSD card slot, where keyboard, mouse, SSD, WIFI & BT, and touchscreen all work. Both USB-C ports allow charging, but no video or data....
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Re: Dell Precision 7670 +Vcore Capacitors
Just got the parts in and it boots up into bios without fault. I'm installing windows to stress test the CPU and GPU. I assume it shutdown immediately when it detected the short. Also, I rechecked the 9550 schematic, its probably VCORE_B+ which should be at 12V, not VCORE itself....Last edited by danlopez1222; 11-21-2023, 02:10 PM.
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Re: ASUS ROG GX531GWR Bios Request
This didn't fix it, looks like it is a PCH failure. All USB 2 links seem to have died somehow. I'll try again after the part come in....
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ASUS ROG GX531GWR Bios Request
Here's a weird one- Device refuses to recognize USB 2.0 devices. Will see USB 3.0 devices and hubs, but nothing USB 2.0. Intel ME problem? Seems to be ok with the internal Bluetooth because it is running USB 1.1.
Model: GX531GW-AB76
Serial: K5NRCV01Y83320C...
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Re: Dell Precision 7670 +Vcore Capacitors
I went ahead and attached a 10uF cap there from a donor, waiting on dell to ship the CAMM to SODIMM so I can test. I'm not paying $300 for 32GB of RAM
It looks like there is enough that the 10uF I added wouldn't make much of a difference....
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Re: Microsoft Surface Book 2
Here you go: Surface Book 2 15" with GTX1060 schematics and board views.
Note: Board views are PNGs and thus not searchable, but should be good enough....
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Dell Precision 7670 +Vcore Capacitors
Found a short to ground on a Precision 7670 +Vcore rail, used voltage injection to identify the bad capacitor and removed it. Short is now removed (2.2ohm on Vcore)
It doesn't look like schematics are public for this model, but it looks like other models (xps 9550, xps 7590) use pairs of 10uF caps here. Does this seem like a safe bet? I've got some spare from an XPS 9550....
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Dell Precision 7670 Schematic and Boadview Request
Hello,
Looking for a schematic for a Dell Precision 7670 (LA-L822P).
Thanks
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Re: i need Dell XPS 7390 2 in 1 Gen 10 bios.bin file
Hi,
I'm having issues with XPS 7390 2-in-1-
Board: LA-G172P
Service Tag: 7PHFQ13
Computer would not boot, just dim amber light whenever power button was pressed. I downloaded a BIOS online and inserted the BIOS region of original bios with service tag info to the new donor bios with new EC and ME firmware.
Now it will post but will not read from USB, or internal NVME drive. SD boot still works.
Must I use the original EC section? I tried with just using the donor...
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