Here, we’ll learn how to test the internal circuit of a used ASIC chips
Before starting, we need to ensure that the chips are not hot
We start by turning the chips face-up and cleaning the pads with isopropyl alcohol
Then we inspect the contact pads on every chip and save the ones that need to be reballed
Checkout the last step of our video on how to pre-tin chips, [ Ссылка ]
Then we need to set our power supply to 1.36 V and 10 Amps
We’re going to read the current drop on the power supply’s display
To do so, we can use the alligator clips that comes with the unit
You can also plug the probes of your multimeter directly on your PSU
A third option would be to use a multimeter and the PSU displays by clamping the alligator clips onto the probes
Don’t let the probes touch each other, shorted chips can arc and burn
The largest contact pad of the ASIC chip is the ground
and the second-largest is the positive pad
We put probes on the respective pads and read the current drop out
A normal ASIC chip behaviour would show the current drop below 2 Amps and rise slowly
A broken chip could have an internal short circuit that would lower the resistance
The lower resistance would result in a current drop above 2 Amps
If the current drops below 2 Amps but doesn’t rise slowly, this could also indicate damage
To be precise (after the drop) the current should rise by about 50 milliamperes per second
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Our selection of ASIC chips:
100x BM1397 recycled ASIC chips for T17/S17/T17+/S17+
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New chips:
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