iFixit - Answers With Device "Power Supply"

Tekpower TP3005T Variable Linear DC Power Supply: In dc power supply voltage is showing 0 value..how to fix it

Thu, 05 Feb 2026 22:33:41 -0700

On display it is showing 0 voltage value ...value is not moving ...i think there is problem in motherboard..how to find the problem

⟐ Answered February 05, 2026 at 22:33 MST

RadioShack 22-510 Switching Power Supply: Getting hash from 22-510

Sat, 10 May 2025 16:08:40 -0700

My Radio Shack 22-510 power supply is generating hash in my receiver. Need solution.

⟐ Answer edited May 10, 2025 at 16:08 MST

Power Supply: APW7-12-1800 12V Power supply for Antminer ASIC Machine

Mon, 10 Feb 2025 11:42:58 -0700

Hello! I have a Power supply for antminer Bitcoin mining ASIC. model apw7-12-1800. Made by Shenzhen Century Cloud Core Technology, Ltd. Model subtype A3, Looking for repair information. any help? Thanks! Dave

⟐ Commented February 10, 2025 at 11:42 MST

HP power supply D13-180N1A 180 w power supply: Power supply not power burnt inducter

Wed, 14 Aug 2024 12:48:47 -0700

Power supply refuses to work seen spark.

Tekpower TP3005T Variable Linear DC Power Supply: show me video for repair dc output not given by the PS

Thu, 16 May 2024 21:12:58 -0700

MY power supply totally not showing any DC output and i didn`t have any about idea about power supply how does it work. How does it protect from over voltage and short circuit.

Neewer NW-100: Not getting 48V on the output side

Fri, 10 May 2024 15:01:01 -0700

I'm trying to get the NW-100 to run a dynamic mike and after getting everything connected, there is no sound coming out of the speaker. I've tested the input and output pins on the NW-100, and am getting 48V on the input side, but nothing on the output side. Do I need to send this back or do more testing?

⟐ Answered May 10, 2024 at 15:01 MST

HP power supply D13-180N1A 180 w power supply: What is the cause of the electric shock

Wed, 15 Nov 2023 00:50:10 -0700

What is the cause of electric shock in power supply

⟐ Answered November 15, 2023 at 0:50 MST

Tekpower TP3005T Variable Linear DC Power Supply: In need of a disc capacitor.

Tue, 08 Aug 2023 16:20:49 -0700

On the main circuit board, there is a large black disc cap just above where the power connects to the board. Mine is burnt and I cannot read its value.

⟐ Answered August 08, 2023 at 16:20 MST

RadioShack 22-510 Switching Power Supply: Acurite Digital Readout Power Supply

Fri, 30 Dec 2022 06:28:47 -0700

Hope someone can help.

I could not find a listed device even close.

The primary windings of the transformer have gone (open circuit). I am trying to find the secondary voltage so I can purchase a new transformer. There are no markings on the transformer. One of the first components after the rectifier on the pcb is an LM340T5780P+ voltage regulator (wired as fixed output). Is it possible to work out it’s supply voltage and hence input voltage from other components from the pcb?

Spec sheet says Vout - 5,12,15. Vin - 10,19,23. Are these just test voltages for the specs or are they the only 3 operating voltages?

It is connected to 2 capacitors with markings - K5R 334K & 105 +25K.

The transformer connects to the two pins.

There is no model number - Acurite Millmate.

The only numbers on the board are; 387575-6033 (printed) and 7-19 570702 1-29-90 (hand written) and ACU-RITE 387575-6034 ASSM. REV A (printed).

There does not appear to be a thermal fuse within the transformer. It has 4 primary windings and a single secondary winding.

The transformer is connected to the two pins shown in photos 1 and 3.

Is it possible to workout the supply voltage from the voltage regulator and the components around it - capacitors and resistors?

Do you mean the tiny capacitors near the regulator that I gave the numbers for, or the electrolytic capacitors?

The main transformer is connected directly to a RMS401L rectifier (Max 35V). The rectifier is connected directly to some electrolytic capacitors, the LM340T5 voltage regulator, an IC - TL494 and the small capacitors associated with the LM340T5 as listed above. The electrolytic capacitors are rated at 16V, the IC is rated at 7-40Vand the regulator is rated at 5V out and 5 to 18V in.

If I had to take a guess, it would be 12V supply to the board. Would that be correct? Could I damage anything with 12V - Would 10V be better?

Can anyone help

Kind Regards

Jeremy

⟐ Commented December 30, 2022 at 6:28 MST

Power Supply: Dover ENM3308021 Power Supply Not Working

Sat, 27 Aug 2022 21:45:43 -0700

I have a Dover ENM3308021 power supply that is not working, or at least that's what I've been told. A customer gave the overly helpful description of it isn't working. When I power it on, the fan and LED's turn on and I get voltage on the pinouts. I matched the voltage (not under a load) to that of a working power supply of the same model. I'm a little out of my normal scope of practice here and could use some suggestions on what to test (and how to test) to see if I can determine the components that are bad. I solder well, so fixing it shouldn't be difficult, it's just a matter of finding what to replace. Any suggestions are helpful!

⟐ Commented August 27, 2022 at 21:45 MST

Power Supply: My TSC printer power supply 24v 2.5a is dead, how to repair?

Sat, 18 Dec 2021 07:11:03 -0700

This power adaptor was powering TSC ttp 244 plus label printer. Power cable is ok, green LED not working, how to go about checking whats wrong.

⟐ Answered December 18, 2021 at 7:11 MST

Power Supply: Voltage spikes to double the limit

Tue, 24 Aug 2021 20:07:03 -0700

I have a cheap adjustable power supply, qw-305d.

When you power it up it goes super sayian, jumping to 62.8v. Then creeps to 0.

No signs of blown capacitors, potentiometers read the correct value, except one reads 10.76 when its a 10k. Fuses are good.

What am I over looking?

⟐ Answer edited August 24, 2021 at 20:07 MST

Power Supply: Dell EP071350 power supply out pins

Tue, 17 Feb 2026 08:35:36 -0700

Hi,

I have Dell EP071350 server power supplies I would like to use as a lab power supply, but I couldn't find the out pins of this model anywhere on the web.

Does somebody know this?

⟐ Edited February 17, 2026 at 8:35 MST

Power Supply: Power Supply only boots after days of sitting unplugged

Thu, 08 Nov 2018 21:27:46 -0700

Hello! I have a Cosair CX500M that is having issues booting a PC. The system will always turn on (HDD, GPU, fans, etc.) but nothing will initialize. When the system will boot successfully, the CPU fan immediately spins up faster than it would when my PSU is having this problem. If I allows the PSU to sit unplugged for a few days it will boot up 100% of the time and remain on for days without issue. If the system shuts off and attempts to power back on it will not work. I suspect that it only boots when the capacitors are fully discharged (or close to it) and otherwise the motherboard is not receiving the Power Good Signal.

My question is, how can I quickly drain the capacitors? I saw a guide here on IFixIt about building a capacitor discharge tool, but I’m not sure how to use it. I have tried grounding the PS_ON pin for awhile (just using a bent paper clip) and that didn’t help. Any ideas?

And no, I don’t want to replace the PSU. I’m just using it in a test system and don’t really care if I break something.

⟐ Answer edited November 08, 2018 at 21:27 MST

Power supply: Service maual, wiring diagram needed - PULS SL20.110

Fri, 29 Jul 2016 06:00:15 -0700

Hello, does anyone have repair manual for this type of power supply from

PULS - SL20.110 ?

Thanks

⟐ Commented July 29, 2016 at 6:00 MST

Power Supply: Can Power Supply be fixed?

Tue, 17 Feb 2026 08:34:43 -0700

I removed a Switching Power Supply 650W ATX 12V 3 pin plug of the PC from the multi-plug without switching off the mains power; consequently as I removed the 3 pin I shorted one of the pins and the power supply didn't work anymore.

Is it possible to repair this or not?

Chris

⟐ Edited February 17, 2026 at 8:34 MST