Bitmain S19 Hashboard

This is a diagram of the voltage domains on the S19 Board to make sure you are using the right domains when testing

Introduce the product / guide here.

This is the back of the S19 board

Repair Tips for the BitMain S19 hashboard for cryptocurrency mining

Problem	Solution
Reading 0 ASIC	On the board there are testpoints for RO,CLK,CI,RST,1V8,0V8. For 0 ASIC you need to connect the board to the testing rig and run it, while it is running check the RO signal using a multimeter by putting a probe on the RO pad and the other probe on the ground points in between the chips. Make sure you are putting the negative lead in the right voltage domain as well, otherwise you may read voltages like 3.6 etc where the signal should read 1.8 volts. Unlike every other signal on the board the RO signal is sent from chip 76 to chip 1. To find the bad chip the fastest you should check chip number 38. The reason you check this one first is if you get an RO signal on chip 38 you can rule out the issue to between chip 1 and chip 37. next you divide the board again and check chip 19. For our example we'll say that chip is reading 1.790 volts. That is still within acceptable limits. so we have ruled it down to chip 1 through chip 18. Now we check chip 9 and find the RO signal is 1.3 volts. That is not a good voltage. Now that we have a good stopping point going down, we now nned to go in reverse because we know the bad chip is between 9 and 18. Lets check chip 13, and when we do we can see its showing 1.8 volts coming out. Go ahead and check chip 14. now on 14 we see the signal drops to 1.6 volts. Before you get to soldering make sure double check your voltages and when you determine the faulty chip there are a few options. Sometimes you can flux and reflow the chip using light pressure on top of the chip with tweezers to ensure it is seated properly, and if that doesn't work you can replace the chip. in our example chip 14 is the faulty chip.
Reading X Asic	The board may read any number of asic chips between 1 and 75 chips. To solve this issue you will need a wire or probes that are connected together to short the 1V8 line and the RO line. you use the same method as 0 asic where you check 38 first and move to the chip that is the issue. in this case we will say that when we short the lines on chip 45 and run the testing rig, and if it says 45 asic then check chip 46 and it says 45 asic, we can determine that chip 46 is faulty. use the same soldering methods as before. Additional Solutions