First of all, thank you all for the help you provide in this forum.
HUAWEI Matebook D15 Laptop - Mod: BOB-WAH9 - Motherboard: DAH98MMB8D0 REV D
Can anyone help me locate the manufacturer of this IC? and tell me if the IC U20 is really the problem.
When looking at the board with the thermal camera, the integrated U20 is set to 90-95 degrees Celsius and the USB-C tester that I have between the charger and the laptop, oscillates between 5V and when it reaches 95º, it drops to 0.9V... .and so on in loop mode.
There are no apparent shorts in the capacitors or coils, and if we apply cold with an air compressor to the U20 chip, the loop stops and the 5V goes to 20V
(USB-C switching), curiously, voltage only enters when the USB-C cable is on one side, if we turn it, no voltage enters the pins of the USB-C connector. Tested with 3 different chargers, and it does the same. The USB-C connector looks ok at microscope.(external and internal pins)
Measuring with the working side of the USB-C cable, Pins 4-5-14-15 give 5V, and drop to 0.9V when the chip is turned to 95º...and the loop begins.
Attached detailed photographs of the motherboard part.
The integrated U20, on the front of the chip it says 4GD and a Chinese logo very small, looking with the microscope from the side, it has 3x3 solder balls.
There is no schematic or boarview available anywhere.
Thanks a lot!!
HUAWEI Matebook D15 Laptop - Mod: BOB-WAH9 - Motherboard: DAH98MMB8D0 REV D
Can anyone help me locate the manufacturer of this IC? and tell me if the IC U20 is really the problem.
When looking at the board with the thermal camera, the integrated U20 is set to 90-95 degrees Celsius and the USB-C tester that I have between the charger and the laptop, oscillates between 5V and when it reaches 95º, it drops to 0.9V... .and so on in loop mode.
There are no apparent shorts in the capacitors or coils, and if we apply cold with an air compressor to the U20 chip, the loop stops and the 5V goes to 20V
(USB-C switching), curiously, voltage only enters when the USB-C cable is on one side, if we turn it, no voltage enters the pins of the USB-C connector. Tested with 3 different chargers, and it does the same. The USB-C connector looks ok at microscope.(external and internal pins)
Measuring with the working side of the USB-C cable, Pins 4-5-14-15 give 5V, and drop to 0.9V when the chip is turned to 95º...and the loop begins.
Attached detailed photographs of the motherboard part.
The integrated U20, on the front of the chip it says 4GD and a Chinese logo very small, looking with the microscope from the side, it has 3x3 solder balls.
There is no schematic or boarview available anywhere.
Thanks a lot!!
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