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Fixing a faulty USB power supply

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Fixing a faulty USB power supply.

A friend got this power supply from gearbest and it arrived faulty. He had no luck with their returns system or email, so asked if I wanted it to make a video about. So let's see if we can fix it.
I'm not sure how the back of the case is supposed to be attached, it came off quite easily and that may hint at a rough shipping experience.
Note that the LCD display just says 5V whatever the output voltage is, and it's just the current that changes.

If you want a set of the desoldering tubes then here's a general ebay com search link:-


Note that the rectifier on the secondary side appears to be an active rectifier type circuit that uses a dedicated chip and MOSFET to achieve rectification with very low voltage drop and heat.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-

This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.

Samsung USB Charger Failure and Repair

In this video I'm examining and repairing my faulty USB phone charger (5V 1A switching power supply). It failed after 2 years of seldom use. I've drawn a partial schematic in the video. Full reverse engineered schematic of this charger is here:


WARNING:
Mains voltage is dangerous! Risk of electric shock and death. Risk of fire. Leave repairs to professionals. You do everything at your own risk. This video is not an instruction (this is just my vlog).

You can support me on Patreon:
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Teardown and fix of 5V 500mAh USB power adapter

Thanks for watching! Please rate and subscribe and also feel free to check out my other videos.

Teardown and fix of a no-name power adapter that has failed because of bad design and poor construction.

Video is a lot longer than I intended to make it.

How to Repair a Power Bank With a Broken Charging Port Connector that doesn't charge

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Fix For No USB Power On Flight Controller

If the flight controller will power with a 5v power source from a Li-Po battery but not the USB, chances are a diode is fried. Here is how to replace a diode.

I cant speak for every flight controller but the diode I used on this one is a BAT54C.

BAT54C diodes -

Tools I use for repairs
Amazon.....................................
Hot air gun -
Flux paste -
Solder paste -
Solder wick -
Helping hand -
Flux cleaner -

Banggood.................................
Hot air gun -
Flux paste -
Solder paste -
Solder wick -
Helping hand -

Ebay..................................
Hot air gun -
Flux paste -
Solder paste -
Solder wick -
Helping hand -

Repairs playlist -

All my playlists -
Video editor -
My personal vlog channel -

12V Power Supply Repair

A defective 12V power supply is opened, examined and repaired.

Contact info, sending stuff in etc.:

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Power Supply Repair

How to repair a switching power supply like those used in DVD players, satellite receivers, VCRs ect. They are all very similar in design, if you can fix one, you can fix em all. Learn from a retired expert in the field.




WARNING: RISK OF ELECTRIC SHOCK EXISTS WHEN WORKING ON ANY ELECTRONIC EQUIPMENT. UNLESS YOU UNDERSTAND SAFETY PROCEDURES AND ARE FAMILIAR WITH ELECTRICAL WORK DO NOT ATTEMPT TO SERVICE YOURSELF

Fix and Repair Broken Laptop Power Cord || Charger pin

UNIVERSAL LAPTOP CHARGER 65 WATT (AMAZON AFFILIATE)
Repairing DC JACK (Pin) of your laptop charger if the cable is not proper....

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My Playlists are :


1. Tech Videos in English





2. Do It Yourself Electronics




3.DO IT YOURSELF COMPUTERS AND PRINTERS



How To Repair a Computer Power Supply (or other switching power supply)

UPDATE: The big double Schottky diode has 2 anodes and 1 cathode. Sorry, I accidentally told it the wrong way around :).

In this video I show how to repair an ATX computer power supply and what are the most common failures. Most of these tips can apply to any switch mode power supply (SMPS).

Watch my previous video - How Does a Computer Power Supply Work:


Schematics of AT and ATX computer power supplies:


My ATX power supply tester:


You can support me on Patreon:


WARNING:
-This video is not intended for laymen.
-Computer power supplies contain hazardous mains voltage!
-Risk of electric shock and death.
-Risk of fire.
-Leave repairs to professionals.
-You do everything at your own risk and responsibility.

Test of the Yihua 502D USB bench power supply. (With fix!)

I tested this on 110V and it delivered the same output voltages with load. (Just thought I'd mention that.) But this power supply has a few issues as shown in the video. It's a shame as otherwise it's quite a neat little device.
The 1A printed on the label may be the fuse rating. I'm guessing the power supply is rated for the full 2A at 5V continuously.
The hot optoisolator issue is probably because it's operating in its linear region and being part of a shunt regulated supply it is effectively a resistor. In hindsight it would have been interesting to bump the opto's LED current up to 6mA or more to see if it turned the transistor on harder and reduced the dissipation.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-

This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
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How to fix not working Samsung Galaxy Note 4 USB charging port flex?

Can’t charge your Galaxy Note 4 through USB port? Why don’t you repair by yourself? This video will tell how to replace the broken Note 4 USB charging port flex step by step. Get original Note 4 USB Board at ; get full and original Galaxy Note 4 replacement parts at .

Tools:
1. Spudger -
2. Phillips screwdriver - ;
3. Metal opening tool -

Witrigs offers not only mobile repair tutorial including disassembly, assembly, and components replacement guide, but also phone accessories review video on YouTube.
Publisher: Witrigs -
Witrigs YouTube Channel -

If you are interested in DIY phone repair or latest phone accessories review,
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USB Hub Fix

This is a simple fix for people having problems with the 7 port usb hub, the problems are mainly power source fighting when connected with the external power supply, also I have pc's that will not boot while the hub is plugged into power as well strange power supply errors on my laptop when shut done & hub is left connected & plugged into AC

This fix will make a special isolated cable that stops the draw & feedback of power to the PC, when using this cable the hub must remain powered by the AC adapter or it will not work.
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How to replace any broken power supply (AC Adapter) with a USB Cable. LIFE HACK

Power anything off of a USB port.

In this video I show how to replace a broken power supply (AC Adapter) and convert it with a USB cable to provide your device with power. By far the most inexpensive and easiest method available.

You will usually get at most between 9 and 12 volts from a typical USB cord FYI. If that's what your device needs then you are good to go!

How to repair a power cord that has been dog chewed.

So if your dog or cat chews through your power cord for you laptop, repairing it isn't as hard as you think and could save you a lot of money.

A 1300 USB Power Adapter

Burn after 1,5 year of use

Amazing how small is it...
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Alesis MultiMix4-USB 4Ch Mixer Repair

An unplanned repair of a brand new Alesis MultiMix4USB 4ch mixing console that I had purchased via Ebay for use in the workshop.
The problem was that phantom power functionality on the desk was broken. Follow me as I go through the diagnosis and quick-fix repair.

More details of the project over at my website -

Lenovo laptop, no power, motherboard repair

Lenovo laptop, no power, motherboard repair. We can see in this video , are two unrelated faults, one its the bios its stuck and the laptop its not coming on, the second is the 5v power switch on the usb power rail.

MacBook & MacBook Air MagSafe Power Adapter broken cable Repair FIX

Suddenly I wasn´t able to charge my MacBookAir anymore, which was quite annoying. After taking a look at the MagSage Power Adapter, I instantly made out the culprit. The cable was broken right at the point where it exits the power adapter, so I couldn´t fix it without opening the adapter itself.
I postponed the broken cable for some days and finally tried to contact apple about this but had no guarantee, AppleCare plan or whatsoever. I really think it´s a unlucky coincidence that the cable breaks exactly at the most inconvenient spot of the adapter.... As I didn´t want to spend 79€ on a new MagSafe power supply, I openend the case and soldered the two cables back together. It was not as difficult as I thought it would be, just the opening of the hardcase took me some effort.
Be aware, if you try to do this like I did, you might need to buy a new adapter, but as it´s broken anyway, why not give it a shot. All you need is some shrink tube and veeeery basic or even no soldering skills. But don´t solder while the cables plugged in ;-)
Music from thx for sharing!!!

How To Repair Apple MacBook Power Supply Charger - Apple Magsafe 60W A1184 - Fix Broken Cord

In this video tutorial Fix Apple Now tech shows how you can fix your broken Apple MagSafe 1 power adapter. You only need some basic tools, replacement cord and basic soldering skills.
If the charger has a damaged cord you can buy a replacement online and follow this tutorial for diy repair. Comment with any questions & subscribe for more tutorials!

HOW TO REPAIR TAB IF CHARGING PORT AND USB PORT NOT WORKING

HOW TO REPAIR TABLET IF CHARGING PORT AND USB PORT NOT WORKING
Gather Tools and Materials for the Repair
When it is time to facilitate the repair, gather all the tools and items necessary before beginning. A general electronics repair kit is good to have on hand for all types of repairs. Start by collecting the following:

Small electronics screwdrivers, Phillips and flat head
Plastic pry tools
A towel
After the repair is complete, store all of the electronics repair items together. A small tool kit or bag helps to keep everything in place. As additional tools are necessary, add them to the kit.
Remove the Old Charging Port
Spread a towel down to protect the tablet and to help keep parts from rolling around. Remove any screws from the back of the tablet and place them nearby. Remove the back of the tablet and look for the connection for the charging port. If necessary, use the plastic pry tool to help loosen the cover or the components blocking the charging port. Unscrew or unsnap the charging port, depending on how the manufacturer attached it.
Replace the Port
Replace the port in the exact reverse order that the old one was removed. Be sure to seat the port fully in the device and secure all attachments that were on the original charging port. Replace all of the screws and ensure that the back of the tablet is attached properly.
Test the Tablet
The true test for the repair is to plug in either a wall charger or a USB cable and attempt to charge the tablet. Try charging the tablet via several methods to ensure that each one works properly. Allow the device to fully charge and then use it until it runs down fully. Charge it again, and verify that the device charges in the timeframe suggested by the manufacturer.

چارجنگ پورٹ اور USB پورٹ کام نہیں تو TAB مرمت کیسے
كيفية إصلاح TAB إذا ميناء الشحن PORT وUSB لا يعمل
kayfiat 'iislah TAB 'iidha mina' alshshahn PORT wUSB la yaemal

如果充电端口和USB端口不工作,如何修复Tab
Rúguǒ chōngdiàn duānkǒu hé USB duānkǒu bù gōngzuò, rúhé xiūfù Tab
ポートとUSBポートの充電ができない場合には、タブを修理する方法
Pōto to USB pōto no jūden ga dekinai baai ni wa, tabu o shūri suru hōhō

ট্যাব রিপেয়ার কিনা শক্তিনবীকরণ পোর্ট এবং USB পোর্টের জন্য কাজ
Ṭyāba ripēẏāra kinā śaktinabīkaraṇa pōrṭa ēbaṁ USB pōrṭēra jan'ya kāja

சார்ஜ் துறைமுக மற்றும் USB போர்ட் வேலை இல்லை என்றால் எப்படி தாவல் பழுது
Cārj tuṟaimuka maṟṟum USB pōrṭ vēlai illai eṉṟāl eppaṭi tāval paḻutu

COMMENT RÉPARER LA TOUCHE SI LE PORT DE CHARGE ET LE PORT USB NE TRAVAILLENT PAS

COMO REPARAR AS LÂMINAS SE O PORTO DE CARGA E A PORTA USB NÃO ESTÃO FUNCIONANDO
टेबलेट को कैसे रिपेयर करें अगर चार्जिंग और यू एस बी काम नहीं कर रहे
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HOW TO REPAIR TAB IF CHARGING PORT AND USB PORT NOT WORKING

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