Avalon PSU3300-01 PLUS1 Repair Manual

Avalon PSU3300-01 PLUS1 Repair Manual


Avalon PSU3300-01 PLUS1 power supply is used in the AvalonMiner 1066 series and 1166 series. To help and guide Whatsminer operation and maintenance personnel to effectively improve the efficiency and accuracy of repairing faulty power supplies and reduce losses caused by downtime, we have compiled and shared the Avalon PSU3300-01 PLUS1 PSU repair manual for reference only.

1. Maintenance tools and materials

Repair tools



Soldering iron

Toor / T12-X


Hot air gun



Absorb gun









Long nose pliers









Wire stripping pliers



Electric screwdriver



Tin wire

Diameter of 0.8mm





Discharger(light bulbs)



Make protective switch materials




Air switch



AC switch



220v light bulb



2. Power supply parameters/specifications

Model: PSU3300-01 PLUS1

Input voltage: 200-285Vac 50/60Hz 16A Max.

Output voltage: 11.5V-14.5V⎓ 3100W

                         12V ⎓ 200W

3. PSU basic component knowledge

3.1 Resistor

3.1.1 Carbon film resistor

Power: 1/16W~2W

Resistance value: 1Ω - 3.3MΩ

Tolerance: ±1%(F) - ±5%(J)

Carbon film resistor

3.1.2 Metal oxide skin film resistor

Power: 1/8W~5W

Resistance value: 5Ω -1MΩ

Tolerance: ±0.1% - ±5%(J)

Metal oxide skin film resistor

3.1.3 SMD resistor

Power: 1/16W~1/2W

Resistance value: 0Ω - 33MΩ

Tolerance: ±5%

SMD resistor

3.1.4 Varistor(safety gauge)

It has non-linear volt-ampere characteristics and is mainly used for voltage clamping when the circuit suffers from overvoltage, absorbing excess current to protect sensitive devices.

Varistor(safety gauge)

3.2 Capacitor

3.2.1 Ceramic capacitor

Withstand Voltage: depending on specific specifications

Nominal capacitance: subject to specific specifications

Tolerance: depending on specific specifications

Ceramic capacitor

3.2.2 X capacitor: Safety capacitance

X capacitor

3.2.3 Y capacitor: Safety capacitance

Y capacitor

3.2.4 Thin film capacitor


High insulation resistance

Wide frequency response range

Thin film capacitor

3.2.5 Electrolytic capacitor

Polarity requirements: the long lead is positive, the short lead is negative.

Electrolytic capacitor

3.2.6 Patch capacitor

Pressure resistance: depending on specific specifications

Nominal capacitance: subject to specific specifications

Tolerance: depending on specific specifications

Patch capacitor

3.3 Transistors

3.3.1 Diode(rectifier,switch,voltage regulator, etc.)

Polarity requirements: ring mark or short pin for the negative pole.


3.3.2 Triode

The main function is signal switching and amplification.


3.3.3 IC (integrated circuit)

PIN identification: Face the letters and codes on the front of the IC to yourself, so that the positioning mark (a dot or notch on the package surface) faces the lower left. The pin at the bottom left is pin 1, and the other numbers are arranged in counterclockwise order.

IC (integrated circuit)

4. PSU working principle

The main circuits of the power supply are the EMI circuit, bridge rectifier, power correction circuit, flyback circuit, auxiliary half-bridge LLC resonant circuit, auxiliary synchronous rectifier filter circuit, main half-bridge LLC resonant circuit, main synchronous rectifier filter circuit, MCU control circuit, protection circuit.

(1) The AC power passes through the EMI circuit and bridge rectifier circuit to convert the AC power into DC power;

(2) DC power is generated through a flyback circuit to generate 18VCC;

(3) 18VCC is converted to power the relay, auxiliary circuit LLC2 IC, main circuit LLC1 IC, and PFC IC;

(4) After the PFC chip works, the PFC voltage is boosted, and the main output LLC1 and auxiliary output LLC2 IC work;

(5) After the main output LLC1 chip works, there is a main output voltage through LLC resonant circuit, and then the synchronous rectification works;

(6) After the auxiliary circuit LLC2 IC works, there is a auxiliary output voltage through LLC resonant circuit, and then the synchronous rectification works;

(7) The auxiliary voltage is translated to supply MCU IC, Which provides software communication, control, protection function.

5. Power Circuit Block Diagram

Power Circuit Block Diagram

6. Common troubleshooting and repair

6.1 PSU whole machine repair judgment

6.1.1 Product appearance

avalon psu3300-01 appearance

6.1.2 Product inspection and testing

(1) First observe the appearance to see if there is any obvious damage. If there are obvious appearance problems, it may have been hit or dropped.

(2) Secondly, shake it to see if there is any abnormal sound. If there is any abnormal sound, the power tube may be blown;

(3) Next, use a multimeter to measure the impedance of the input and output to see if there is a short circuit:

a. Whether the input terminal is loose or arcing, whether there is a short circuit between L/N/G;

b. 12V main circuit output terminal deformation, short circuit with the shell, short circuit measurement between positive and negative poles;

c. The 12V auxiliary circuit output terminal is damaged, short circuit between PINs, short circuit measurement between positive and negative poles;

(4) Check whether the fan blades are blocked by foreign matter;

(5) When the PSU is powered on, short-circuiting the AGND and SETUP of the 5Pin terminal can activate the main circuit output;

(6) Observe the panel indicator light. The green light is on during normal operation. The red light indicates abnormality and the input voltage needs to be disconnected immediately.

(7) Turn on the power supply and observe the internal indicator lights:

a. The indicator light is always on: the output fan is faulty;

b. The indicator light flashes once and goes off for 3 seconds: protection for excessive ambient temperature;

c. The indicator light flashes 2 times and goes off for 3 seconds: secondary heat dissipation temperature protection;

e. The indicator light flashes 3 times and goes off for 3 seconds: LLC heat dissipation temperature protection;

f. The indicator light flashes 4 times and goes off for 3 seconds: PFC heat dissipation temperature protection.

(8) If there is no response after powering on, open the cover and discharge the capacitor.

a. Turn on the input control switch (0: off, 1: on), and measure whether the switch is closed normally;

b. Observe whether there are any burned components inside the power supply;

c. Measure the main power tube to see if there is any damage.

(9) Bare metal power on: Measuring key voltages

a. Large electrolytic capacitor voltage: about 390V;

b. Primary auxiliary circuit VCC power supply: about 15V;

c. Auxiliary output power supply: 15V;

d. Auxiliary circuit: 12V

e. Main circuit default output: 13V

6.1.3 Flowchart of disassembling the casing

disassembling the casing

6.1.4 PCBA appearance defect judgment

disassembling the case

6.1.5 PCBA hardware fault analysis flow chart

PCBA hardware fault analysis

6.1.6 Use multimeter to detect faults

multimeter to detect faults

multimeter to detect back faults

6.2 Common fault analysis and repair

6.2.1 List of common faulty devices




Main defective Parts

Parts to Diagnosed


PFC voltage no 390V

PFC circuit

TR1 short circuit

F2, RB1, RB2, RT1, D5, D9, D13, Q32, Q33, Q34, R311,  R309, R314, R329, R330 some of these parts fail


PFC voltage no 390V

PFC circuit

C4, C24 fail



No output

13V main

MOS drive


Q10, Q13, Q3, Q7 shortcircuit


Some components of U7, U19, U12, RT1, D5, D9, D13, R329, R330 failed


No output

12V output

MOS drive circuit

Q1, Q2 shortcircuit

Some components of U6, Q21, Q23, R53, R56, R87, R110 failed


No output

13V main output circuit

Q6, Q8, Q9, Q11, Q12, Q14, Q15, Q16, Q17, Q18, Q19, Q20 failed

Any one of them fails, short circuit between G/D/S


Main output high ripple

13V main output circuit

C31, C32, C40, C41, C46, C47, C48, C49, C51, C52, C55, C56, C57, C59, C60, C62, C63, C64, C65, C66, C70, C71, C72, C73

Any one of them fails and the capacitance decreases


No output

12V auxiliary output circuit

Q22, Q24 invalid

Any one of them fails, short circuit between G/D/S


No output


The fan blades are clogged, or the fan wire is corroded and open circuit



No output

Input circuit

ON/OFF Switch fail



No output

12V output cable

12V output cable is damaged or fall off


6.2.2 PCBA common faults and repairs

(1) No output

Step 1. check whether the C4 capacitor voltage is 388 volts to 420 volts. if no, check the circuit near U15 to see if there is 14 volts.

Step 2 . 14 volts are powered by U10, U7, U6. If normal, check whether the output MOS is short-circuited. If not, check whether the front-stage MOS tube and nearby circuits are normal.

(2) Main circuit has no output

Auxiliary circuit is normal and the main circuit has no output. Check whether the 7th pin of the communication board has 1.5 volts. If so, it means communication signal is normal. Check whether input and output MOS tubes are shortcircuited, and whether the components near U12 and U19 are normal, and whether the PFC voltage is normal.

(3) IIC communication out

First make sure that the auxiliary circuit of the machine has 12V output, and short-circuit AGND and SETUP with a short-circuit cap to start the main circuit, and the output voltage is normal, indicating that the power supply of the machine is normal.

It is necessary to check whether the output 6P cable is damaged and the wire sequence is correct. If it is correct, check whether the components around the U14 chip are damaged, and use a multimeter to connect DAT and CLK to the ground resistance value is correct.

If it is not correct, it can be judged that it is a problem with U14 and nearby circuits. If the resistance value is correct, it is necessary to check whether U17 and the nearby circuit and power supply voltage are normal. If the program is lost, it will not communicate.

(4) PSU failure

Measure C12, C17, C31, C32, C40, C41, C46, C47, C48, C49, C51, C52, C55, C56, C57, C59, C60, C62, C63, C64, C65, C66, C70, C71, C72, C73.

(5) The machine cannot be powered on

Step 1. Check ON/OFF switch fail or not.

Step 2. F1 fuse broken or not.

Step 3. C4 capacitors voltage within 388-420V.

Step 4. Measure with multimeter to check input MOS fail or not.

7. Maintenance Precautions

(1) When bad power supply is confirmed, be sure to use the protective switch to avoid explosion injury.

(2) Pay attention to electrostatic protection during maintenance, and wear an antistatic bracelet.

(3) Electric soldering iron temperature management, it is recommended to control in 380℃~420℃.

(4) When replacing materials, use products of the same model and specifications. Do not use substitute materials without permission.

(5) The defective materials that are repaired and replaced shall be marked as defective, and the on-site positioning management shall be optimized to avoid mixing with qualified products.

(6) Record the power supply S/N serial number, bad phenomenon, bad reason, maintenance method and other information, regularly provide maintenance record form.

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