L3+ U73 Step-down Module
L3+ U73 Step-down Module
1-10 pcs $ 5.36
11-20 pcs $ 5.26
>21 pcs $ 5.16

MOQ: 1 pcs Weight: 0.05 KG

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Product description:

L3+ U73 Power Supply Step-down Board

Why use L3+ U73 power step-down module?

If the L3+ power chip is damaged or there is no voltage in the voltage domain, the L3+ U73 module can be used for replacement. The L3+ U73 power step-down module can be used in the L3+ 10V step-down circuit control, on the Hash board with no material, serious oxidation, and lack of material. The module has a total of 8 external solder joints, 4 solder joints do not need to be soldered with wires, and can be connected to 3 external wires (the PIC cannot adjust the voltage) or 4 external wires (the PIC can adjust the voltage).

1. GND: The negative pole of the power supply is grounded

2. 12V: 12V input

3. EN: Power on signal, connected to pin 3 of Q10

4. HG: Controlled by the upper MOS tube, connected to pin 4 of the upper MOS tube

5. LG: Controlled by the lower MOS tube, connected to pin 4 of the lower MOS tube

6. DAOUT: Connect to PIC, can accept PIC voltage regulation

7. FB(mos): Feedback input, connected to the large inductor L2, close to the MOS end

8. SW(out): Connect to the output terminal of the large inductance L2

U73 step-down board

U73 step-down module diagram

L3+ U73 module installation steps:

1. First remove the original IC U73, and use a multimeter to check whether the original 3 MOS tubes have any problems. The normal resistance of the large inductance L2 to ground is about 40 ohms.

2. Put the module on the inductor as above, connect the FB (mos) pad and the SW (out) pad to the inductor, and use an air gun and an electric soldering iron to dissipate heat.

3. Connect GND to the left side of capacitor C943, as shown above.

4. Connect 12V to the right side of capacitor C943, as shown above.

5. Connect the HG signal to the 4th pin of the MOS transistor Q5, as shown in the figure above, pay attention to check whether there is a short circuit.

6. Connect the LG signal to the 4th pin of the MOS transistor Q4, as shown in the figure above, pay attention to check whether there is a short circuit.

7. Connect the EN signal to pin 3 of Q10. If this pin is not connected, it is a forced power-on, which will cause the control board to fail to turn off the power supply of the hash board.

8. Remove the resistor R24, and connect the DAOUT signal to the position shown in the figure R24. If this signal is not connected, the PIC cannot adjust the voltage and can only work with a fixed voltage.

L3+ power supply step-down board

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Edoardo 2022/5/11 15:09:11
Q:Hello,

how much is the cost for one working DR5 hashboard including shipping to Italy?

Thanks
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We contacted you via e-mail. Please feel free to contact us if needed.
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orhan öğüt 2022/5/11 4:19:54
Q:selam ben türkiyede asıc miner tamiratı yapıyorum benimde ismimi yayınlarmısınız
teşekür ederim
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вы 2022/5/11 2:32:25
Q:вмамв

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Мы связались с вами по электронной почте. Пожалуйста, не стесняйтесь обращаться к нам в случае необходимости.
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Sebastian 2022/5/6 22:43:00
Q:Hi, are they compatible with the antiminer S19 line?
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We have contacted you by email. Please feel free to contact us if necessary.
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Cesar 2022/5/4 1:30:30
Q:I got an Avalon 841 hashboard with a missing ceramic capacitor, downside says "C2", do you know that capacitor value? Thank you
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mostafaabbaspor 2022/5/3 18:19:35
Q:Hello Please send me the number of chips with the price
A:Dear customer, what type of chip do you need? I offer you a quote. We have contacted you by email, please feel free to contact us if you need it.
Matt 2022/5/2 22:51:36
Q:I am looking for a 14 pin ribbon cable for a Avalon 1246, is that an item you have?
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Kylie Hamilton 2022/4/29 1:47:54
Q:What type of power supply is needed to use through the PC mode switch. I used the original power supply first and realized later that it said it's an essentially invalid way to test a hashboard.
A:Dear Sir/Madam, please follow our FAQ and contact us after-sale service for support. thank you.
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Ryan 2022/4/28 7:03:29
Q:Do you repair antminer s15 hashboards?
A:Dear customer, it is a pity that we cannot provide hash board repair services. Please feel free to contact us if you have any product needs.
jim 2022/4/24 15:16:51
Q:product deliver to malaysia will take how long?
A:Dear customer, it will take about a week.
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