MS Surface Book 3 - Keyboard works only in UEFI/Linux

[survivalbloke]

This is a very weird issue which I'm having trouble finding a common thread.

The keyboard is registering keypresses in either the UEFI, or a live Linux USB environment - I used Ubuntu for testing. The keyboard backlight is lit.

The keyboard is registering keypresses in Windows or any Windows-related bootable device. For example, it does not work in Hirens Recue or a Windows 11 bootable installer.

When booted to Windows, not only is the keyboard not registering keypresses, but my USB keyboard is not either!

USB mouse and integrated trackpad...

[Francisco.s]

Hello, I'm trying to repair an HP 27 Quanta N76 (DA0N76MB6E0 Rev E).

I only get 3.3V, 5V, and 1.05V; no other voltages.

I tried the BIOS and changed the KBC. The KBC self-programmed upon power-up after changing it.

The VR-On is missing for NCP81220, but 1.2V is also missing for DDR4, so 1P2V_PWRGD is low. SUSON or DDR_VTT_EN are not present on the DDR4 voltage regulator (RT8231BGQW). It seems the KBC isn't triggering these signals.

I'm using the Quanta N91 schematic, but there are too many changes that make it nearly impossible to measure signal...

[repair-it]

I'm not sure if this is correct, the output pin 7 is grounded or the ic has a short. I'm just trying to rule it out. https://www.ti.com/product/LM2574?qgpn=lm2574

[Coguar]

I’m asking if someone who has a DSO-TC4 Fnirsi component tester could upload the contents of its internal memory for me, since mine arrived with a corrupted USB memory and a factory reset or firmware upgrade doesn’t help. Also, the device makes a strange clicking noise when it’s turned off but still connected to USB. Thanks in advance — anyone interested can check out the link bellow.

...

[oism]

looking for service manual yamaha musiccast 50 wx-051

[oism]

Looking for service manual for yamaha subwoofer ns-nsw100

[koby058]

Hi

While trying to replace intersil 9241H, i have knocked out some component (maybe a capacitor) that was connected to pin 29
board model: DAZJ2SMBAF0 Rev: F

attached the best picture i found (marked on the second pic)

9241 DataSheet: https://www.farnell.com/datasheets/2710985.pdf...

[Xohaib]

Hello everyone,

I’m looking for a full 8MB BIOS dump (.bin) for the Linx 1020 tablet with the Intel Atom x5-Z8350 processor. My device is currently not powering on, and I believe the BIOS might be corrupted. I plan to reflash it using a CH341A programmer and SOIC8 clip.

If anyone has a working Linx 1020 and could share a verified full dump from the SPI BIOS chip (usually Winbond 25Q64 or similar), I’d really appreciate it. A clean dump from a known working unit would help restore my board safely.

If the dump is from a Z8300 variant, please note it —...

[ianbak]

Hi,

I have a Dell Latitude 7290 that power cycles instead of turning on. The circuit board is an LA-F311P

I have systematically checked pretty much every internal voltage, and they all seem to be present except for CPU Vcc_Core, which doesn't turn on.
The impedence the Vcc_Core coils is 8.3 Ohms, though, which seems reasonable.
Vcc_SA does get enabled, and reads 1.05V. This is driven by the same power controller IC as Vcc_Core, so I am assuming that that is good.
There is no Vcc_GT, but I have read that that can be normal as it only turns on when GPU...