Repair: MT3608 boost converter

Рет қаралды 42,562

Күн бұрын

Somewhere while making the 9V USB rechargeable battery of my previous video (see • Made: USB Rechargeable... ) , I managed to kill the boost converter. The module doesn't output the required voltage and the MT3608 chip on the damaged module gets very hot.
In this short video you can see how I repaired the module by replacing the chip (for less than 10 cents, see link below):
Video index:
0:00 - Introduction
0:24 - Testing the faulty module
0:58 - What may be the problem
1:37 - Buying replacement chips
1:56 - Trying a new desoldering method
2:25 - Back to using the iron
2:33 - Soldering the replacement chip
2:42 - Testing the repaired module
2:55 - Thank you and don't forget to subscribe!
Links and references:
- Buy chip on AliExpress: s.click.aliexpress.com/e/QZfqjAI
- Making a mini boost converter using the MT3608 and SMD components: • Made: Mini MT3608 boos...
- Making a 9V USB rechargeable Li-ion battery: • Made: USB Rechargeable...
- GreatScott about the TP5410 LiPo Charger & Boost Converter: • 2$ LiPo Charger & Boos...
- someone having problems with MT3608 modules: • Caught on FIRE?? MT360...
- MT3608 datasheet: www.olimex.com/Products/Bread...
- Wikipedia about static electricity: en.wikipedia.org/wiki/Electro...
- Wikipedia about Mosfet: en.wikipedia.org/wiki/MOSFET

Пікірлер: 94

@MindFlareRetro 6 жыл бұрын

That is a creative desoldering technique. The temperature of the chip had to have been near 220C, assuming it was lead-free solder. More importantly, a simple fix to avoid discarding the module altogether. Nice one!

@MaxintRD 6 жыл бұрын

+MindFlareRetro - Creative indeed! For GreatScott it worked better (see his video), but I was afraid I would ruin the solder pads on this almost fully operational $1 module... ;-)

@michaelgreenlee2797 5 жыл бұрын

Glad you made this. Had to circle back on the explanation of operation. Thank you.

@MaxintRD 5 жыл бұрын

Glad you liked it. Thank you for letting me know!

@DustinWatts 5 жыл бұрын

Hi Maxint! The MT3608 is a chip i’m currently looking at for use in a new version of my MiniAmp. Easy to find a pretty straight forward!

@MaxintRD 5 жыл бұрын

Hey Dustin! Thank you for your comment. Your MiniAmp is a nice project and your EasyEDA videos (see kzfaq.info/get/bejne/jNp7dtymmqzNpHk.html) helped me a lot! You may also want to take a peek at my video about making a tiny boost converter using the MT3608 (see kzfaq.info/get/bejne/gZ18qZh3vLq8aY0.html). The MT3608 chip is easy to use. You only need to be careful not to set the output voltage below input voltage, so be careful to use right values for the resistors and don't short the sensing pin to ground (which can be done on these boost converter modules by turning the potmeter to one of its the ends). Also note that the amount of current it can supply is limited. When the difference between input and output is large, it can deliver less current and it will be less efficient. Good luck with your new MiniAmp version!

@riseoftech4k332 7 жыл бұрын

hello, i found your channel through one of your comments and i have found it to be pretty interesting.. good luck for your YT channel.. i subscribed to your channel since it relates to the videos im making!!!!

@MaxintRD 7 жыл бұрын

+Rise of Tech 4K - Thanks! I saw some of your videos and enjoyed them too. I liked your Arduino robot and look forward to see more of your projects. Have fun!

@riseoftech4k332 7 жыл бұрын

thank you... im editing a new video as of right now

@thefirstsin Ай бұрын

there's actually a way to stabilize the output and it can even handle all types of load when it is fixed.

@MaxintRD Ай бұрын

I saw a couple of different improvements. Which one are you referring to?

@CrazyCoupleDIY 6 жыл бұрын

Good work bro

@aldebaranflash2663 6 жыл бұрын

good job

@daijoubu4529 4 жыл бұрын

There's a video on KZfaq on how to desolder without hot air, the trick is to bend some copper wires all around the legs, add solder and off it goes, very easy.

@MaxintRD 4 жыл бұрын

I've seen that video. It's very informative. One time I tried that method I wasn't very good at it. Another method I once used (with good success) was using a needle between the chip and the PCB and a soldering iron, to lift the individual legs. While it worked, I think I prefer to use hot air.

@Gkid8 5 жыл бұрын

Yeah, so I just did this with one of mine. I only found out it was the main IC after unsoldering everything on the board and checking connections. I should have checked that IC first but now I know! I ordered replacement IC’s so hopefully it will be as good as new! I just had the pot below the input voltage for too long...

@MaxintRD 5 жыл бұрын

Well done! While these are nice cheap modules, their lack of protection is apparantly resulting in some casualties. Luckily a chip replacement can revive them to be as good as new. Just beware of the voltage setting...

@Gkid8 5 жыл бұрын

Yep, $0.86 and free shipping for 10 of them from aliexpress. I'm going to have to make some DIY boost converter board with multiple outputs and good pots. If I put a pic/arduino on there I could check the voltage and make calculations for minimum resistance. I'm mainly using it right now for a dirt cheap bench power supply for low current running on a laptop battery cell (they are dangerous to take apart but I did carefully).

@jefersonbarros8289 4 жыл бұрын

is there no substitute?

@tocadisco4166 6 жыл бұрын

Nice work! What is the inductor value? 22uH? Do you have any information about the ripple values at the output?

@MaxintRD 6 жыл бұрын

Toca Disco - It is labeled 220, so I think you're right about the 22uH. In this video I only replaced the chip, but you may find my subsequent video about making a mini boost converter interesting too. I haven't measured specifics such a ripple values and unfortunately my cheap DS112 oscilloscope isn't quite suited for precise measurements.

@radius.indrawan 4 жыл бұрын

nice repair video. i don't know about the idea of pushing high amps for desoldering components, but that sounds risky, it could damage nearby compenents or the copper traces on the board, maybe? but that limited edition tweezer you used for picking the chip off from the iron tip though.. that's awesome. :)

@MaxintRD 4 жыл бұрын

Thanks... Yeah, I should be careful as I only have those! ;-)

@radius.indrawan 4 жыл бұрын

@@MaxintRD just sharing an alternative way here, hope you don't mind.. :) for desoldering small chip like that, you could put a blob of solder at each side, kinda like if you want to short all three legs of each side altogether, then melt the blobs back-and-forth for each side several times, while your other hand holding the chip with tweezer, ready to lift it off when the solder blobs at both side are molten already. eventually, it will lifted-off within some seconds. hints : it will be more easier if you have a secondary iron and melt the blobs with two irons at the same time, one for each side, just like how smd hot tweezer works. ;)

@MaxintRD 4 жыл бұрын

@@radius.indrawan - I don't mind. Thanks for the suggestions. I used the blob technique too. Not with two irons though. I also once lifted a CH340G chip using a needle to put some force on one side. Nowadays I most often use a hot air gun, which I didn't have when making this video.

@radius.indrawan 4 жыл бұрын

@@MaxintRD yes, hot air station is indeed very useful for this kind of situation. looking forward to your next video Sir. cheers. :)

@AntonyCartwright 6 жыл бұрын

Cool!

@NitroPcb 4 жыл бұрын

Can anyone tell me what will be the value of R1 AND R2 if we want to get fixed 6.7V output not using rheostat to adjust.Input is 3.7-4.2v

@MaxintRD 4 жыл бұрын

In my follow-up video about the MT3608 you can find the formula from the datasheet and how I used it to set a fixed voltage: kzfaq.info/get/bejne/gZ18qZh3vLq8aY0.html

@jefersonbarros8289 4 жыл бұрын

Could you activate the subtitle please, I'm still learning to listen in English but I can only understand more writing

@rehanshayaan6872 3 жыл бұрын

Bhayya good morning. Can I connect MT3608 boost converter to output of TP4056 while it is charging an 18650 battery? Please reply

@MaxintRD 3 жыл бұрын

Yes you can connect the boost converter to anything that can deliver sufficient voltage and power. Mind you though that you don't overload the TP4056, as it usually won't deliver a high current.

@MrAR-ft3iq Жыл бұрын

I have tried this module. At first all was okay. From 3.7-4.2 V input source I config. for 12V output. My router was working fine. But back in couple of hours it stopped working. I found that my battery was drown empty, though I was using charging mode through a TP4056. However, I then use another battery (3.7-4.2 V) but this time it fails to delivered the desired 12V load. I checked with multimeter before connecting load it shows 12V in the output jack. Battery is fine. But whenever I connect to my router as load it falls to 1/10th of the desired volt ! I don't understand what's the problem ? (input connected through TP4056) Your experienced input is very much appreciated.

@MaxintRD Жыл бұрын

Sorry for the late reply. Sounds like you are trying to use a battery that cannot provide the requested power. I have had this with batteries that were at the end of their lifespan. These would work fine with low currents, but fail when currents got slightly higher. Best way to test them is using a multimeter and adjustable constant current load.

@shubhamsawant5129 2 жыл бұрын

Same problem with xl6009 while make rechargeable power supply. Have you found the reason how it happened? Your input is very much appreciated.

@MaxintRD 2 жыл бұрын

i think it was due to drawing too much current. i don't think these cheap boost-converters offer any protection against doing that.

@shubhamsawant5129 2 жыл бұрын

@@MaxintRD I just checked that diode was blown.. so I replaced it by 1N4007 (I know this one has greater voltage drop) and I m able to vary from 3.54 volts to 3.8 volts with 4 v input. Also it is not heating now. Whether replacing with right diode will solve my problem or the ic is blown. (ic : xl6009) Or i doubt the inductor is blown

@MaxintRD 2 жыл бұрын

@@shubhamsawant5129 Good you found a defective part. A boost converter should generate higher output than input. In my case I think the mosfet in the chip was blown, resulting in an internal short . The inductor can easily be checked with a multimeter, as it's just a wire it should have low resistance. Another possible cause of damage could be reversing the polarity.

@timle1286 6 жыл бұрын

I just bought 2 of these units on eBay. So far neither of them works to increase my output voltage. My input is 6.7v and output stays around 6.6v no matter which way I turn the pot or how many turns. Now I don't know if it's defective, or still repairable? Any idea?

@MaxintRD 6 жыл бұрын

Hi Tim, my first guess is that they may be not faulty, but just not set correctly. I've experienced that the range of the potmeter is largely inactive. I would first disconnect the load and turn it down to the minimum level all the way untill you hear the meter tick. Then, with you voltmeter connected to the output, turn it the other way until you see the voltage change. Then continue slowly until you've reached the desired voltage. Then connect the load and check the voltage. If voltage drops a lot or the chip gets hot, your load may be too big. Mind you that if the chip gets hot you should cut the power to avoid damaging it. Good luck!

@timle1286 6 жыл бұрын

Thanks for the quick reply! I removed load from Vout and left Vin connected to 6.7v and turned 15-20 turns counterclockwise until I heard the click noise. Then I measured Vout and it magically jumped up to about 27v. Then I turn clockwise slowly to bring down to the voltage I need. I would've never guessed these steps!

@raviriley9877 6 жыл бұрын

this worked! thanks for taking the time and effort to reply to this, really helped!

@MaxintRD 6 жыл бұрын

Ravi Riley - Great! Glad to read that it works. Thank you for your reply. Good luck and have fun playing with electronics!

@themanthatallescan8012 6 жыл бұрын

Held! Thanks!

@esecallum 6 жыл бұрын

i replaced the100k 25 turn multi turn pot with a normal 100 normal 270 degree trimpot. the 25 trimpot is really stupid and you need a screwdriver and there is no knob for it anywhere

@MaxintRD 6 жыл бұрын

Ese Callum - That multiturn trimpot is indeed not ideal. Next to what you mention, it is also inactive in large part of the range, rendering many turns without response. I can imagine you may want to improve the range by adding a resistor in series to the pot.

@esecallum 6 жыл бұрын

did it already.added 82k resistor to 22k trimpot.this is for the version where the 3 rd leg of the precision trimpot IS connected and the voltage variation only occurs over about 20k. in the second variation the 3rd led of precision trimpot is not connected to anything and voltage variation occurs more evenly over a 100k normal trimpot

@svem1972 3 жыл бұрын

Sir your demonstration is really amazing and truly on right time have found. Thanks for presenting such a wonderful content. I have connected MT3608 module with 5v of power bank as input and boost to 12v, later i moved from 5v to 9v and where output remains the same like this couple of times have tested, However i could boost the voltage to desired output with any given input range, when load is connected, automatically voltage get drop to the same volt as input given. When i touch the IC it was too hot, immediately turned off and checked the diode its fine, later some time when connected to 5v power bank or source from 5v dc power adapter, i could see 12volt but unable to connect my router or any dc appliance that has 12v. Could you please give some insight. Your input is very much appreciated and thanks in advance for your help and support.

@MaxintRD 3 жыл бұрын

Thank you for your post. Reason the chip gets hot is probably that it can't deliver the power that the load is asking. Have you tried using a very small load? Some modules that can deliver more power use heat sinks. Another possible solution is to try increasing the input voltage. The efficiency of the chip is much lower when the voltage difference is high. Also make sure the input device can deliver the required power. I suggest you to use (multi)meters to measure voltage and current under load. Hope these tips help. Good luck!

@wunderwaffeyt4077 4 жыл бұрын

I watched this video in desperation. I bought 4 modules and I managed to kill 3 of them with reversed voltage.

@MaxintRD 4 жыл бұрын

Luckily the MT3608 chip is quite affordable and not to hard to replace if you have a hot air gun or decent soldering iron. Coincidentally this morning I used an MT3608 chip to repair one of those cheap USB boost converters. The original chip couldn't withstand the current I was pulling, got hot and released some magic smoke...

@troyw5832 4 жыл бұрын

Its not damaged its the chip its shorted and other in sets can trip it and high volt out like 8.4v in 25v out gose low volt high current 😕 iam using in a few application projects on the 6 board shorted 5 so far smoke including pin 4 has the issue in the transistor gate!!!!!!!! I'am trying to get the internal on the chip to fix the over load issue.....

@MaxintRD 4 жыл бұрын

Hi Troy, thank you for commenting. You raise an interesting point. As far as I know it is indeed the internal MOSFET that is shorted. I always though that the shortage was caused by irreversible damage. So you think there is a way to fix that short-out? If you do find a way I'm very interested. Perhaps you can make a follow-up video?

@troyw5832 4 жыл бұрын

@@MaxintRD looking into it, and used a bunch off directors to fix most off the issue on the neg line but when i run the IR RF at the same time it gets a bit tweky could be a run of a safety the transistor for shut off it can become unstable as most of the negs are all directed allready to get it stable and safety setup, on the single IR line its fine and RF but dule mmmmmm i once put a npn type on a IR decor on the out gate pins blow the hole lot one after the next just kept blowing and was the type specified (wrong category) by the looks as you can get reflection on the parts which blow or get unstable when you lock transistor gates in this is a issue with pin 4 for the voltage gain the line seems to be a bit tweky especially on the curcit in development but i had it running on a motor fan 24v low ma above 24v it can trip this mosfet in it apparently as i have no internal curcit diagram which is slowing me down, dont ever short and i noticed a issue with the dc meter and multiple out lines which keeps going to 1.8v high current which should not happen but put it to the battery all ok again yet seen led on the meter and fine??at near 2 amp????? 😞 .

@MaxintRD 4 жыл бұрын

@@troyw5832 - Sorry, I can't make heads or tails from your reply. I probably lack some understanding. Perhaps you can show how you repaired it in a video?

@TheKiller1922 6 жыл бұрын

So basically it is the chip problem and there are no other ways to repair it, right? I have the same problem with mine, 12v input and 11.3v output immediately after I connected it to a sound amplifier, though I tuned it to 16.5v without load beforehand.

@MaxintRD 6 жыл бұрын

Killer1922 - Is it still is boosting the voltage to 16.5V without load? If that's the case, then you don't have the same problem. In my case the chips internal mosfet seemed to be blown and generating a shortcut. That 0.3V output drop is indicative of the typical drop of a diode, most likely the diode between input and output. It seems that yout chip is not switching when the load is on. Chances are that your load is too high. Please note that the current limits of this module are depending on the input voltage. I would suggest you to test your module using lower loads. For instance using a constant current load that can be set to specific currents. Using a multimeter, you can also check the resistance of the output pins (when not powered!) and com[are your findings with mine.

@TheKiller1922 6 жыл бұрын

Thanks for the info. Well, my converter does not boost anything in both loaded and unloaded stages anymore. The voltage drop i about 0.2...0.3 V and output voltage stays 11.3 regardless of the adjusting so I presume I have the same problem as you do. It's ok, I'll just order some bulk 3608s from China and resolder it. Anyway, it looks like I made a mistake using 3608 as a converter in the first place. I use it as a booster for 12 to 16.5v for 2x15W stereo sound amplifier. The amp reaches about 2 A in max mode so I'll better look for some more powerful boost. Thanks again. Your video gave me the right answer after several hours of search. Keep up the good work!

@MaxintRD 6 жыл бұрын

Sounds like your chip is damaged indeed... Luckily the MT3608 modules are quite affordable... Thank you for your response. It's nice to read my video was helpful. I think you're right and that you've indeed exceeded the current limits by using drawing to much current. The listed maximum current of 2A is under optimal circumstances (i.e. specific input versus output voltages and perhaps also proper cooling). As you stated you probably need a beefier boost-converter for your amplifier. (FYI: In a follow-up video I made a mini boost converter using that same chip, which does work, but doesn't deliver the same current due to choosing different components.)

@phannsovanvichet6042 4 жыл бұрын

My mt3608 is broken ic i want to repair it please tell me to find ic to replace it

@MaxintRD 4 жыл бұрын

The IC is called MT3608. I ordered some on AliExpress and I included a link in the description of the video. Perhaps my video can help you with the replacement of the chip. Good luck!

@phannsovanvichet6042 4 жыл бұрын

What the model of ic 6pin on MT3608 boost converter

@MaxintRD 4 жыл бұрын

@@phannsovanvichet6042 The model number of the chip is MT3608. You can find the datasheet online. In a follow-up video I used the datasheet to make a mini boost converter based on the same MT3608 chip. Perhaps you find that video interesting too. Also read the comments below. You may find many other questions answered in the comments of other people.

@harunlisic 5 жыл бұрын

I've bought 2 of those, straight out of box not working, input voltage 12.52 V, output voltage 12.08 V. It's weird, *i just think this type of Boost Converters are low quality.*

@MaxintRD 5 жыл бұрын

Hi, I don't think the quality is low, they just have some peculiar behaviour and lack protective components. Here are some tips: 1: On first use they need to be set using really low input voltage. Don't start with 12V input as the output may be set lower than 12v, which could kill the module. Start with low input voltage (e.g. 3V) and then set the output as desired. 2: You should never set the output below input voltage. This can damage the chip. 3. Don't draw too much power. When the voltage difference is high, the chip can deliver much less power. Put your finger on the chip too check if it gets hot and test it with the maximum power you intend to draw. Hope these tips help. In my view these are cheap yet fine modules once you are aware of their peculuarities.

@randomstuff-wg6nj 5 жыл бұрын

@@MaxintRD AGREE I have ordered 5 of these 2 have arrived But None of Them Work !

@harunlisic 5 жыл бұрын

I have reported the problem, and contacted the seller, and encouraged him to test some of them on his own. What happened next, he admitted it is his fault. They were sent non working. He returned the money, but I still lost $1 for Local shipment which is even more than the Products price, since he obviously will not return the money your government takes. Anyways, nice video, and At least I can use the Coil to make my own boost converter with Arduino hehe.

@MaxintRD 5 жыл бұрын

Allright... That's a good idea! GreatScott has a video where he builds a boost converter using an ATtiny chip. In a follow-up video I used another MT3608 chip and some smd components to solder up a mini boost converter.

@harunlisic 5 жыл бұрын

Yes I kinda built it few weeks ago with arduino, but my parts are kinda big, not as compact, I've built it for Bee Venom collector. Perhaps it doesn't matter its big, I'm kinda lazy to build another one 😕😂

@umairmujahid7518 6 жыл бұрын

My module is not working and the resistance between Vin and Vout is 110K Ohms........ Help.

@MaxintRD 6 жыл бұрын

Umair Mujahid - if the resistance is that high, you don't have the same problem. Try to follow the steps mentioned in the comments below. (Use low input voltage, e.g. 3V, then turn clockwise until it clicks, then measure and turn many times anti clockwise while watching the output voltage).

@umairmujahid7518 6 жыл бұрын

My output voltage and current is same as input voltage and current!

@MaxintRD 6 жыл бұрын

Umair Mujahid - I understand. Either your module isn't working or you've not set it correctly. Read the other comments for some valuable tips.

@umairmujahid7518 6 жыл бұрын

Now it's working properly..... Thanks

@MaxintRD 6 жыл бұрын

Umair Mujahid - Congratulations! Good to read that the tips helped. Have fun!

@fccsouza1 Жыл бұрын

Good 🎉🎉🎉Very Good. I fron Brasil.

@ianhosier4042 2 жыл бұрын

If people realised that the maximum input voltage of these modules is 6v they wouldn't end up blowing them up. I use them routinely to convert 5v to 9v or 12v with no problems. In fact a lot of electronics such as TTL can't tolerate voltages above 6v and are run at 5v for that reason. Plus why would you use a boost convertor for high input voltages?

@wsanders1 Жыл бұрын

That is not correct. Input voltage for the MT3608 is rated up to 24V.

@wsanders1 Жыл бұрын

The TM3608 is rated for up to 24V input, BUT the max voltage for the feedback pin is 6V. We don't have a schematic, but my guess is that the pot can easily come set to deliver more than this voltage to the feedback pin, so many of the units probably blow up right out of the box if connected to more than 6V. It's a stupid design. These modules would be perfect for running low power 24V PoE devices off 12V, if they were any good.

@ianhosier4042 Жыл бұрын

@@wsanders1 I have seen the schematic and it's dumb as you can easily twiddle the pot and apply too many volts to the feedback pin. One simple wiring change would eliminate the problem but until someone changes the PCB used on these cheap Chinesium modules the only safe way to use them is to power them on 5v initially then set the output voltage. Then the input voltage can be safely increased. Lots of the ones I have received have been set to blow up right out of the box!

@ArduJimmy 11 ай бұрын

Solved! and please ADD new tutorial about: how to repair broken pin or part of arduino board. Start from promini 5v 328p, nano 5v 328p and uno 328p. Pleaseeeeeeeeeeeeeeeeeeeeeeeeee. Thanks 😍😍😍😍😘😘😘

@MaxintRD 11 ай бұрын

Great idea! I once replaced the diode of an Arduino Nano, after frying it by reversing polarity. It was not very hard to do and that Nano still works... With regards to this booster board, I saw other people make improvements to make it better survive mistreatment and to lower the standby power usage. Perhaps once I make a follow-up video to show both improvements. (I don't have links here now, you may find them in comments below, or search KZfaq for MT3608).

@ArduJimmy 11 ай бұрын

@@MaxintRD okay. thanks.

@Lee90000 5 жыл бұрын

going blind looking at that tiny six-pin IC. I'm not going to try to out solder robots.

@MaxintRD 5 жыл бұрын

I've been told that a microscope will fix that. I had similar problems with some really tiny RGB leds the other day. Two escaped from my tweezers and were never found back. The 0805 SMD size still works fine for me, but with smaller sizes I spent too much time retrieving dropped components...

@jj74qformerlyjailbreak3 Жыл бұрын

All these modules blow the input capacitor. Every time.

@MaxintRD Жыл бұрын

Are you sure you're not using them incorrectly? I've never had the cap blown. Not one single time. In my experience I only burned out the chip. Probably by drawing too much current. Have you tested the module after replacing the cap? I can imagine that the input capacitor does have certain limitations though. The input voltage probably should not be too high or reversed. Have you measured under what circumstances the cap blew? Perhaps you can measure current and voltage after replacing the cap, or with another module?