Need advice testing a samsung power supply board with scope

[repair-it]

I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor.

[EpicFix]

At the risk of sounding like a total noob I'm asking If anyone can help me locate the "Desktop" folder on Windows 11. I am trying to make a backup of all the user data from an SSD (mounted externally) that has Windows 11 installed. I was able to do this before up to Windows 10 by navigating to the User folder --> Username and there I would see the individual folders, Documents, Downloads etc. Attached is a screenshot of the folders I do see within the Users / Username folder. Any help locating the desktop folder will be greatly appreciated. Thanks in advance to the community. ...

[notallbad]

Originally the tv arrived with dimmed backlights (not failed leds) but everything else worked ok. Adjusting backlight in menu did nothing but voltage changed on dimming control pins,
0% p_dim at 1.65v and a_dim at 1v
50% p_dim at 3.3v and a_dim at 1.65v
100% p_dim at 3.3v and a_dim at 2.88v

Changed backlight leds anyway as always like to have complete peace of mind they wont fail shortly after selling the tv. No change as expected!

Leds are 2 rows of 15 6v leds.

On inspection of the power board found diode MBR3200 shorted so replaced with...

[quadra]

Hi Everyone... I need C48 MB V2.30 Bios Dump or Bios Repair

Pictures of motherboard is here

And my backup bios

Thnx for help......

[double_DD]

Hi all,

It's gonna be a long intro, so please buckle in, as it's a problem that's been bugging me for several days now. Thanks in advance.

So, I have 2 modems/routers, whatever the proper nomenclature is, one from ISP and one mine. I want to power them via USB-C rather then their original mains adapters (for reasons, that are hard to explain to sane people). Both routers come with 12V/3A mains adapters.
For this purpose I acquired USB-C charger with 250W and 5 ports, 2 of which can supply max 20V/3A. Since 12V isn't a standard PD voltage option (and to future proof,...

[winbond]

hello ,
please fix my corrupt bios
DAN14EMB6D0 REV D
SN/8CC0391K45...

[ICRMIIX]

BoardView Asus Zenbook UX425UG UX425UQ UX425UG NB2567 PCB MB V4...

[arya fikri]

NEED bios lenovo ideapad flex 5 C570-14A 213112-1...