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ANT S19 Maintenance Manual

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I. Maintenance platform/tool/equipment preparation requirements
※ The copyright of this article belongs to Bitmaintech Pte. Ltd. . The article shall solely be reprinted, extracted or used in any
other ways with the permission of the copyright owner. Please contact Bitmain official customer service if there is any need of
reprinting or quoting.
1. Platform requirements:
Rubber blanket repair workbench (workbench needs to be grounded), anti-static wristband and grounding.
2. Equipment requirements:
Constant temperature soldering iron (350℃ - 380℃) and pointed soldering iron tip are used for soldering small patches such as chip
resistors and capacitors; heat gun, BGA rework station are used for chip/BGA disassembly and soldering; multimeter with soldering steel
pin and heat-shrinkable T bush is used for easy measurement (Fluke is recommended); Oscilloscope (Agilent recommended), network
cable (requirements: Internet connection, stable network)
3. Requirements for test tools:
APW12 power supply (APW12_12V-15V_V1.2 and power adapter cable (self made: use thick copper wires to connect the power supply
at positive and negative poles and the hashboard. It is recommended to use 4AWG copper wires with a length of 60cm or less) for the
hashboard. Use the test fixture of the V2.2010 control board. The positive and negative poles of the test fixture need to be installed with
discharge resistors. It is recommended to use a cement resistor of 25 ohms and more than 100W.
4. Maintenance auxiliary materials/tool requirements:
Solder paste column M705, flux, board washing water with absolute alcohol; board washing water is used to clean up the solder residue
after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the surface of the chip after repair ；
ball-planting steel mesh, solder absorption wire, solder ball (the ball diameter is recommended to be 0.4mm); when replacing a new chip,
you need to tin the chip pins and then solder to the hashboard, and then lock large heat sinks after applying thermal gel evenly on the chip
surface.
1) Barcode scanning gun (purchase reference link: https://item.jd.com/11829261868.html)
2) Port adapter board RS232/TTL adapter board 3.3V
(Purchase reference link: https://detail.tmall.com/item.htm?spm=a230r.1.14.6.751533f7AP9fR8&id=583960428696)
3) Self-made short-circuit probe (use pin wire for welding, require the heat-shrinkable T bush, prevent short circuit between probe and
small heat sink)
5. Common maintenance spare material requirements:
0402 resistance (0R, 51R, 10K, 4.7K,); 0402 capacitor (0.1uf, 1uf)
1. Pay attention to the operation method when replacing the chip. After replacing any accessories, the PCB board shall have no obvious
deformation. Check the replacement parts and the surrounding parts for open circuit and short circuit issues.
2. The maintenance operators must have certain electronic knowledge, more than one year of maintenance experience, and be proficient in
BGA/QFN/LGA package soldering technology.
3. After repairing, the hashboard must be tested for more than two times to be OK before it can pass!
4. Check whether the tools and hashboard testers can work normally, determine the maintenance station to test software parameters, test
fixture versions, etc.
5. In the test of repairing and replacing the chip, the chip needs to be tested first, and then the function test shall be performed after passing.
The function test must ensure that the small heat sink is welded qualified. When installing the large heat sink, the surface of the chip must
be evenly coated with thermal gel and the cooling fan shall be at full speed. When using the chassis to dissipate heat, 2 hashboards should
be placed at the same time to form an air duct.
6. When measuring the signal, use 4 fans as assistance for heat dissipation, and the fans shall maintain full speed.
II. Maintenance requirements
1
S19 Maintenance Guide

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Summary of Contents for ANT S19

  • Page 1 S19 Maintenance Guide I. Maintenance platform/tool/equipment preparation requirements ※ The copyright of this article belongs to Bitmaintech Pte. Ltd. . The article shall solely be reprinted, extracted or used in any other ways with the permission of the copyright owner. Please contact Bitmain official customer service if there is any need of reprinting or quoting.
  • Page 2 S19 Maintenance Guide 7. When powering on the hashboard, user must first connect the negative copper wire of the power supply, then the positive copper wire of the power supply, and finally plug in the signal cable. When removing, the order of installation must be reversed. First remove the signal cable, then remove the positive copper wire of the power supply, and finally remove the negative copper wire of the power supply.
  • Page 3 The hashboard is composed of 76 BM1398 chips, which are divided into 38 groups (domains), and each group is composed of 2 ICs; the operating voltage of the BM1398 chip used in the S19 hashboard is 0.36V; for the 38th, 37th, 36th, 35th, 34th, 33rd, 32nd group (7 groups in total), LDO is powered by the 19V output from the boost circuit U9 and outputs 1.8V.
  • Page 4 S19 Maintenance Guide Figure 4-3 Figure 4-4 2. S19 hashboard boost circuit: The boost circuit transfers the 14V powered by the power supply to 19V, as shown in Figure 4-5.
  • Page 5 S19 Maintenance Guide Figure 4-5 3. Signal trend of S19 chip: 1) CLK (XIN) signal flow direction, generated by Y1 25M oscillator, transmitting from chip 01 to chip 76; voltage of 0.7V-1.3V; 2) TX (CI, CO) signal flow direction, from IO port 7 pin (3.3V) into IC U2 through level conversion, and then transmitted from chip 01 to chip 76;...
  • Page 6 S19 Maintenance Guide It will take 2ms to increase to 24.5V. It will take 1.9ms for simulation increase Figure 5-1 Second step: to check the voltage output in the voltage domain The voltage of each voltage domain is about 0.36V. If there is 14V power supply, generally it has domain voltage. The priority is given to measure the output of the power supply terminal of the hashboard and whether the MOS is short-circuited (measure the resistance between pins 1, 4 and 8).
  • Page 7 S19 Maintenance Guide Figure 5-3 Figure 5-4 Figure 5-5 PIC programming steps: 1. PIC program programming on the hashboard. Program: 20200101-PIC1704-BM1398-V89.hex Download the programming tool: PICkit3, pin 1 of the PICkit3 cable corresponds to pin 1 of J3 on the PCB, and pins 1, 2, 3, 4, 5, and 6 need to be connected.
  • Page 8 S19 Maintenance Guide Figure 5-7 Figure 5-8 Forth step: check the boost circuit output C55 in the test diagram 4-9 can measure 19V voltage. Figure 5-9 Figure 5-10 Fifth step: check the output of each group of LDO 1.8V or PLL 0.8V...
  • Page 9 S19 Maintenance Guide...
  • Page 10 S19 Maintenance Guide Figure 5-11 Sixth step: check the chip signal output (CLK/CI/RI/BO/RST) 1. Refer to the voltage value range described by the signal trend. If the measurement encounters a large deviation of the voltage value, it can be compared with the measured value of the adjacent group to determine.
  • Page 11 S19 Maintenance Guide B) Check whether the four temperature senses U4, R28~R30, U6, R31~R33, U7, R34~R36, U8, R37~R39 and the matching resistance welding are abnormal, the location of the temperature sense is shown in Figure 5-14, the temperature sense is all located on the back of the PCB, the resistance is located on the front of the PCB, and whether the temperature-sensitive 3.3V power supply is normal;...
  • Page 12 S19 Maintenance Guide b) If one chip can be found in step a), it indicates that the first chip and the previous circuit are good. Use a similar method to check the subsequent chips. For example, short-circuit the 1V8 test point and the RO test point between the 38th and 39th chips. If the log can find 38 chips, the first 38 chips have no problem;...
  • Page 13 S19 Maintenance Guide Figure 5-16 d-2) The second case; the test time is almost twice as long as the good board (sometimes the value of X will change every time you test, and sometimes X=0); at this time, the log usually has the following information (the red number is not 13, depending on which seat the hashboard tester is connected to);...
  • Page 14 S19 Maintenance Guide 6. Phenomenon: Check that chip test is OK, PT2 function test serial port does not stop (long-distance running) Repair method: during the PT2 test, watch the serial port print log. When the serial port starts to operate for a long time, use a short-circuit probe to short-circuit RO&1.8V.
  • Page 15 S19 Maintenance Guide Figure 6-1 2. The whole machine cannot find the IP Probably, the IP cannot be found due to abnormal operation. Refer to the first point for troubleshooting. Check the appearance and welding of the network port, network transformer T1, and CPU.
  • Page 16 S19 Maintenance Guide 2) Less link: Less link refers to that among the 3 boards, 1 piece is missing. In most cases, there is a problem with the connection between the hashboard and the control board. Check the cable to see if there is an open circuit. If the connection is OK, the user can test the single board PT2 to check if it can pass the test.

  • Page 17: Other Matters Needing Attention

    S19 Maintenance Guide Figure 6-7 7) One hashboard has low computing power: As for this situation, you can log in to the IP through the Putty software to observe whether the domain working voltage of this board and the NONCE return are normal. You can repair it according to Putty prompt.
  • Page 18 S19 Maintenance Guide Observe the appearance Check the power supply Locate the chip; re- Locate the fault of the board and the Test with soldering shall be preferred Measure resistance according to inspection voltage at signal testing hashboard tester and then replacement can...