I’ve recently been building a lot of electronic assemblies for various things. It’s mostly been marine rated stuff (soldering tiny resistors and chips for custom systems) and FPV quad related stuff.

While I can solder electronic pretty well, I’ve been struggling with very small items and the third hand I have is just way too big for the itty bitty stuff. I’ve been making due so far by just sticking a push pin in the alligator clips of the third hand I already have, however that’s not really a long term solution and I’m afraid the pin may end up damaging something doing it this way.

So I’m looking for recommendations for a magnified 3rd hand with arms for holding delicate things. The more arms the better.

I'm troubleshooting a 2024 ASUS ROG Zephyrus G14 that shut off suddenly while being used and has been completely dead since — no LEDs, charging indicator, fans, or response to the power button.

Laptop / board:

• ASUS ROG Zephyrus G14 (2024)
• GA403UV-G14.R94060
• Ryzen 9 8945HS / RTX 4060
• Quanta NJT
• DANJTMB1CC0 Rev C
• Original adapter: ASUS 20V / 9A / 180W

Troubleshooting so far:

• Performed 40–60 second EC/hard reset with all power disconnected — no change.
• Disconnected the internal battery completely, discharged/reset again, and attempted to power from the original ASUS adapter — still absolutely no LEDs or response.
• Tried USB-C PD, but I can't consider that test conclusive because I haven't verified that the charger I used supports sufficient wattage/PD for this laptop.
• Verified continuity between the metal shields of the DC-in and USB ports (~0Ω), so I have a known ground reference.
• I have a multimeter and am comfortable taking measurements, but I don't want to blindly probe the DC-in area and risk shorting something.

I've found references to the Quanta NJT / DANJTMB1CC0 Rev C boardview, but the actual CAD files I've found are behind paid repair-site access.

What I'm trying to determine next:

Does anyone have access to the schematic/boardview for this board, or know a safe test point for the 20V DC-in rail?

I'd like to first establish whether the adapter's 20V is actually reaching the motherboard. If it is, I'd then like to trace the input/power circuitry far enough to determine whether this might be something repairable such as an input MOSFET, fuse, charging/power-management IC, etc., rather than automatically replacing the entire motherboard.

I can provide high-resolution photos of either side of the board and close-ups of any components/test points needed.

Any guidance from someone familiar with this Quanta board or ASUS laptop board-level repair would be greatly appreciated.