April 23rd, 2023, 2:30
April 23rd, 2023, 2:41
April 24th, 2023, 18:33
April 24th, 2023, 20:28
April 25th, 2023, 2:18
November 26th, 2024, 8:04
November 26th, 2024, 12:17
November 27th, 2024, 5:22
fzabkar wrote:Measure the resistance between ground and each of the inductors.
Does the 1.7V (1.8V ?) supply disappear too? If so, then there may be an e-fuse or current limited load switch near the 3.3V input which is shutting down due to overload. Can you tell us the markings on the e-fuse?
Can you tell us the markings on the circled ICs?
November 27th, 2024, 14:34
November 28th, 2024, 6:54
fzabkar wrote:"1A" is a MOSFET, not an e-fuse. There should be 3.3V on both Drain and Source.
PMPB15XP, NXP, P-channel Trench MOSFET, -12V, -11.8A, marking 1A, DFN2020MD-6 (SOT1220):
https://assets.nexperia.com/documents/data-sheet/PMPB15XP.PDF
TPS3897ADRYR, Texas Instruments, Single-Channel, Adjustable Supervisory Circuit, 1.7V - 6.5V, marking UL, USON-6:
https://www.ti.com/lit/gpn/tps3897
TMP102, Texas Instruments, Low Power Digital Temperature Sensor With SMBus/Two-Wire Serial Interface, SOT563, marking CBZ, 1.4V - 3.6V:
http://www.ti.com/lit/ds/sbos397b/sbos397b.pdf
SN74LVC1G07, Texas Instruments, single 1.65V - 5.5V buffer with open-drain outputs, marking CV, SON-6:
https://www.ti.com/lit/gpn/sn74lvc1g07
November 28th, 2024, 14:59
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