Recent content by lakykherson

Using the same tester and the same cable, I’m testing a donor board. All the measurements there are normal, both on the EDP and USB. But on this board, it’s showing high values on both the USB and EDP. I’ve cleaned all the contacts.

Could you please clarify if the measurements are taken by resistance or by voltage drop using the diode mode? And is there a measurement chart for this model that can be used to check with a multimeter?

decided to take measurements using the EDP connector and found many signals that show discrepancies. An interesting question came up: why does the device show high resistance values everywhere? Or what exactly is it measuring in this case? Usually, when a device fails, the resistance values are...

I repeated the measurements using the SUEM2TOOL device. It also shows elevated resistance. I took additional measurements with a multimeter: the red probe was connected to ground, and the black probe to pin 33. In diode mode, it shows a value of 642.

U3100_W chip overheating, but S-UEM2 tool shows normal values – what could be the issue I’d like to repeat my question. According to the readings from the S-UEM2 tool, the U3100_W chip (or its contacts) shows all resistance values within the expected range. However, the thermal camera shows...

I used the device you recommended and took the measurements. Interestingly, it shows that all resistances on either the right or left connector are within the normal range. Could it be that the chip we discussed, which we suspect to be faulty, is showing normal resistance values on this...

How can I find out if this board will work for me? Here is a photo of my board; I have A2251 (820-01949-07), but in the listing, it says A2251 820-01949-A. Can you please tell me if this part will fit...

Just for understanding: in general, if such chips are sold separately as new, are there any programmers that can flash the required firmware? Does something like this even exist?

We checked with the thermal camera. This chip heats up the most. The temperatures of the other three are not significantly increasing, but this one has the highest temperature on the board. U3100_W

Here’s the translation: "Could this issue be related to this device?" [UnionRepair U301 Data Assistant for MacBook - Read/Write, Backup & Repair](https://www.unionrepair.com/by-u301-data-assistant-for-macbook-read-write-backup-repair.html)

Where can you buy such spare parts?

To make sure that the issue is with that port, is it possible to desolder the controller and not use this port for power, while using the remaining three ports so that the laptop can still turn on? Is it possible to test this way at all?

For some reason, the PP20V_USBC_X_VBUS voltage on these ports is not 20 volts, but 5 volts. This happens on all four Type-C ports.

I measured four microchips and LDOs and found only two signals U3100_T PP3V3 UPC W LDO - 0,503 PP1V5 UPC LDO CORE - 0,506 U3100_X PP3V3 UPC W LDO - 0,506 PP1V5 UPC LDO CORE - 0,512 U3100_R PP3V3 UPC W LDO - 0,507 PP1V5 UPC LDO CORE - 0,373 U3100_W PP3V3 UPC W LDO - 0,482 PP1V5 UPC LDO CORE -...

Currently, I have a multimeter, a lab power supply, and a thermal camera. What can I check with this equipment?