Good afternoon everyone,
This is my first real post here. I am very new to a lot of this, so bear with me. I recently acquired a Nikon Z8 that had been dropped and will not power up. After removing the back of the camera, I found a large FPC cable that was half out of the connector. Great, I though I'd found the problem and reseated the cable and tested. Still no power. I started digging further and found an inductor that had overheated, bulged, and left a residue on the heatsink. I removed the inductor and retested, thinking maybe I would have some functionality, but still nothing. When powering up the board, I did notice that the PMIC next to the inductor (Monolithic MP4570) was getting hot to the touch. I also tried replacing the inductor with one of equivalent value and it also got hot. after that, the PMIC and inductor no longer got hot and incoming voltage to the motherboard dropped, like I had dead short. After removing the PMIC and the inductor, that issue went away, and incoming voltage went back to normal. I do have a new PMIC and inductor on the way, but I am suspicious that I still have an issue downstream. I checked resistance from the output caps for that rail to ground, and found ~2.1 ohms, which seems low to me adding to my suspicions. I've attached a few pictures of the PMIC with the bad inductor, as well as an overall image of the motherboard (Not my image, as I have the camera put together at the moment). I appreciate your help!!
Equipment:
Fluke 45 Bench meter
Topward TPS-4000 power supply
Fnirsi smart tweezers
Hot air station
Various soldering equipment
This is my first real post here. I am very new to a lot of this, so bear with me. I recently acquired a Nikon Z8 that had been dropped and will not power up. After removing the back of the camera, I found a large FPC cable that was half out of the connector. Great, I though I'd found the problem and reseated the cable and tested. Still no power. I started digging further and found an inductor that had overheated, bulged, and left a residue on the heatsink. I removed the inductor and retested, thinking maybe I would have some functionality, but still nothing. When powering up the board, I did notice that the PMIC next to the inductor (Monolithic MP4570) was getting hot to the touch. I also tried replacing the inductor with one of equivalent value and it also got hot. after that, the PMIC and inductor no longer got hot and incoming voltage to the motherboard dropped, like I had dead short. After removing the PMIC and the inductor, that issue went away, and incoming voltage went back to normal. I do have a new PMIC and inductor on the way, but I am suspicious that I still have an issue downstream. I checked resistance from the output caps for that rail to ground, and found ~2.1 ohms, which seems low to me adding to my suspicions. I've attached a few pictures of the PMIC with the bad inductor, as well as an overall image of the motherboard (Not my image, as I have the camera put together at the moment). I appreciate your help!!
Equipment:
Fluke 45 Bench meter
Topward TPS-4000 power supply
Fnirsi smart tweezers
Hot air station
Various soldering equipment
Attached Files
) I have a Corsair CX750M (Model 75-002019) that I picked up for free about 4 years ago. This is the PSU:
