Avalon A11 A12 Series Hash Board Repair Guide

How to repair Avalon A11 A12 series hash board?

Ⅰ. Avalon A11 A12 hash board introduction

Figure 1: Hash board

HASH—S-A3201-X4030-V1-2-200929 version

A single hash board is connected in series by 120 A3201/3200 main chip signals, and each group is one domain. The overall layout is divided into 40 groups, and the groups are connected in series. The first 34 groups are powered by cross-domain 7, and the three main chips in each group are powered in parallel. Each group of voltages is: Vcore, VTOP, VDDIO. The signals are: CKin, Cin, Rin, Din and CKout, Cout, Rout, Dout. Each group has 2 LDO power, 1.8V—DDIO and 0.75V—TOP. 1.8V takes the power supply of the corresponding domain, and 0.75V takes the corresponding 1.8V power supply. There are voltage test points for Vcore, VDDIO, and VTOP on each chip side. The last 6 groups are separately powered by the boost circuit (17.7V), and then the U98 LDO is converted (13.9V~15V) to supply power to each group of LDOs.

Hash Board Interface

1. Power terminal: positive (+) negative (-) power supply

2. Jamelink interface data signal communication

HASH—S-A3201-X4030-V1-3-201116 version

1. V1-3-201116 version 1.8VLDO uses substitute materials for some materials. The locations on the materials are as follows:

2. Note: The position of the yellow mark in the picture is the position of the alternative material welded in the hash board in the opposite direction.

3. Before changing to 1.8VLDO, confirm the model package first.

Figure 2: Position of reverse welding of LDO substitute material

Figure 3: Location of LDO replacement material on the board

Ⅱ. Introduction to Test Fixtures for Repairing Hash Boards

Preparation tools: AvalonMiner 1066Pro 1166 1166Pro 1246 1246Pro Test Fixture

Figure 4: Test fixture connection diagram

Test fixture accessories:

Avalon Control Board 1066pro 1166pro 1246 1126 1248 *1

Test fixture foot switch *1

Innosilicon Avalon 7*2 14P data cable 30cm *1

USB to TTL *1

Serial port tool:

Figure 5: Serial port tool interface

Ⅲ. Chip pin definition

The following resistance parameters are for reference only 3201-BIN9.

Figure 6: A3201/A3203 chip

For A3203 & 01 products

After the SMT factory removes the chip that failed the functional test, please use a multimeter to measure whether there is a short circuit/open circuit between all pins of the chip and pin 29 (VSS).

The image above shows the number of each pin.

It is normal for pins 13, 14, 25 and 29 (VSS) to be short-circuited.

It is normal for pin27 and pin29 (VSS) to be open circuit.

If there is a short circuit or open circuit on other pins and pin29 (VSS), it will be judged as an abnormal chip. No cross-verification is required and returned directly by RMA.

Figure 7: 1.8V and 0.75V LDO schematic

Figure 8: U98 LDO schematic

Ⅳ. Hash Board Repair Procedure

1. Keep complete machine maintenance records for subsequent retrospective analysis.

2. Make a note of the hash board with the heat sink that was removed from the complete machine. There is an SN QR code number behind the hash board that can be scanned via WeChat.

3. Preparation before repair: computer, oscilloscope, multimeter, magnifying glass, test fixture, heat sink, cleaning agent, tweezers, constant temperature heating station, heat gun, soldering iron, solder wire, flux, cotton swabs, dust-free cloth, temperature measuring instrument, electric screwdriver, silicone grease, steel mesh.

4. Read the hash board LOG information through the serial port to locate the hash board problem.

The number of asic count is 120 chips. If it is less than 120 chips, it needs to be repaired. error 0 means no error value is reported. volt represents the voltage value, and nonce: 0xc2b21b5 represents the working value of a single chip. If "nonce": is 0x0, maintenance is required. copper 1 means there is a problem with the welding at the bottom of the negative copper pillar and needs repair. If "E: no asics!!!" appears when testing the hash board, it means there is a problem with the hash board, and the circuit is blocked and needs repair.

If the circuit is blocked, you need to measure each group of signals in sequence, including the four signals CK, D, R, and C:

CK: The working clock of the chip, the frequency is 4MHz;

D: The chip’s transmission data signal;

R: Reset pin of the chip;

C: The transmission clock signal of the chip, the frequency is 6.097MHz;

The oscilloscope is set to AC mode;

The amplitude is set to 1.00V/div;

The frequency is set to 200ns/div.

Figure 9: CK waveform, frequency 4MHz

Figure 10: C waveform, frequency 6.097MHz

Figure 11: D waveform

Figure 12: R waveform

Ⅴ. Welding operation

1. Adjust the welding heating station to 235-240°;

2. Adjust the soldering iron temperature to 280-380°;

3. Adjust the heat gun temperature to 380°-390° and wind speed 80-90;

4. Prepare the same BIN chip for replacement;

5. Before replacing the chip, the location of the replacement chip needs to be cleaned. After removing the chip, it is necessary to clean the foreign matter on the pad before applying tin. The pins of the pad must be fully tinned (add a little tin to the large pads at Pin29 and Pin30 to prevent continuous soldering), add a sufficient amount of tin to 1-28Pin at the bottom of the new chip (a small amount of tin is added to the large pads at Pins 29 and 30).

6. Chip Pin 1 should correspond to the pin 1 number of the hash board chip's pad, and the pads should be aligned left and right for welding (a small amount of soldering paste on the surface of the pad can help solder and position the chip).

7. Clean and inspect the solder joints of the soldered chip (the 28pin solder joints are full, there is no short-circuit phenomenon, and no tin beads overflowing)

8. Due to excessive temperature when repairing the hash board, surrounding components may loosen, and components may shift from the soldering pad or fall off due to misoperation such as unstable hands. It is necessary to check that the surrounding components are normal before powering on for testing.

Ⅵ. Troubleshooting Case Analysis

Figure 13: Missing chip failure when reading

Figure 14: BIN information cannot be read

Figure 15: BIN information error fault

Figure 16: Circuit failure

Figure 17: Reporting multiple faults

Figure 18: A21 error, check the soldering pins or replace them

Figure 19: A21 error, check the soldering pins or replace them

Figure 20: Reporting multiple faults

Figure 21: Temperature abnormality failure