Diagnosing And Fault Finding A Dead Milwaukee Circular Saw / PCB Repair.
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- Опубліковано 9 сер 2022
- In this video we're having a look at a Milwaukee circular saw. The unit is dead apart from the LED that lights up when pressing the trigger. I disassemble the unit, diagnose faults on the PCB, and show how to re-assemble the unit.
The unit inside is very similar to the SDS drills I have repaired in another video, although the firmware would be different as the circular saw doesn't implement speed control.
Replacing the blown mosfets inside the device usually fixes them.... however not always it seems....and some parts aren't readily available :(
You can always buy the complete motor assembly from Milwaukee, but where's the fun in that! - Навчання та стиль
Have just started my re-discovery of....... actually it might be possible to fix this (after being returned from Milwaukee Germany, deemed unfixable/ not worth it) & glad I stumbled across your channel. Thank you! Soldering iron I fixed thanks to another channel, batteries thanks to a Greek guy & guys channel, & now is time for the circular saw & rotary hammer drill thanks to you! Please keep up the great informative videos!
& I just checked the soldering iron repair was also thanks to your video! Can't believe I didn't subscribe back then already!!! Again, much gratitude to you good sir!!
Thanks! I've also looked at 10x Milwaukee batteries too. I just haven't got round to editing and posting that video yet. Good luck with your repairs! Let me know if I can be of any assistance.
A great effort, it was interesting to see the mosfet fault finding even if you didnt get a full fix, there's always another to fix next time 👍😊
I did a follow up video on this a few weeks later as I managed to obtain a MCU board 👍
@@BuyitFixit nice, I'll look out for it 👍
Milwaukee ll love you 😂 theres always another fix 😂
I have been watching Dean Doherty repair a variety of cordless tools and Milwaukee comes in for a lot of criticism from him for not being worth repairing because of the lack of availability if individual spare parts.
If any part of the motor/switch/controller assembly fails you have to replace the whole assembly.
Yes, the price of which is almost the same as a new tool. I did manage to repair the cordless sander for a fraction of the cost though 🙂
@@BuyitFixit yes after writing my comment I watched the second video.
It shows how important it is to have a triage system at disposal sites so that if any item is not working or broken beyond repair it can be dismantled to recover reusable parts to aid repair of similar equipment.
Another great video. Shame it couldn't be fixed. That was about where I got to with the fsx sawzall, even replaced the driver chip but no luck. Back of the cupboard for now.
That sounds a bummer. The problem was the other board on the one that I fixed. I think its like a brake from what I remember. I'm not sure if you have an oscilliscope? but there should be a square wave driving the mosfets on that board and it wont run without it. What was the original problem? Mosfets?
@@BuyitFixit it might have been the brake board to start with but I think I may have shorted something at 1 stage and I pretty confident I fried the driver. Bought 1 from ali express but that didn't fix it. No life at all now, so back of the cupboard for now.
@@MrTorch8 The driver chips contain a processor and firmware so unless it was programmed for that device I dont think it would do anything. I've also had fake chips from Ali Express and I ordered some mosfets from there too which some arrived already shorted so I don't think I'd really trust a lot of parts bought from there.
@@BuyitFixit I was thinking it wasn't programed or not programmed to match the milwaukee tool. Could be a fake too maybe. I'll just have to wait for another run over 1 to pop up at work.
Very helpful, thank you!
Glad it was helpful!
I have had 2 failed Milwaukee 18v circular saws now, didn't register, so too expensive to fix. Now I bought the equivalent Makita and I am not held to one brand. The Makita is the superior saw, lighter and not so bulky .
Always register, the production lines are so intensely managed that mistakes happen.
I think that there is some kind of design issue with these saws. My other one is acting up and a local farmer asked if I could have a look at his as it also has stopped working. I've also seen a lot of faulty saws on Ebay...
This failure happens on the gen 2 7-1/4 inch versions too but, it’s less common. I dropped off my M18 fuel gen 2 circular saw at the nearest Milwaukee service center for warranty work because it’s less than a year old since the tool been hesitating.
My other saw has started doing similar where it will start to spin when the trigger is pressed and then kind of free wheels. I think the main microcontroller on these goes faulty and causes the problems as I checked the mosfets and they all appear to be fine.
Mine was just over year old when i had a prblm and i only had used it once then after few months it worked again then 6 months later still worked once, after that fews days later dead as a door knob. Maybe I should have bought the Makita ?
@@j.johnson5217 Milwaukee should make a gen 3 version.
@@davidperry4013 That's fine but in the meantime i got a 180 dollar junk circular saw that don't work, i used it about 4 times it's close to 2 years old and just a worthless piece of garbage
Awsome video mate,
Are you able to list the soldering/cleaning tools and products/parts you used and were I can get them from?
I have one of these that stops working every couple of days! I open it up and during this process the fault then goes away? I have no idea what the problem is but thought it might be a simple fix compared with your issues? I suppose the problem could be anywhere but thought I would ask your opinion. Any suggestions, would be most grateful. Regards. Kel.
I'd check the switch first of all, perhaps it requires cleaning. Unfortunately I have another model which also works a bit intermittently and I think it's a faulty of the main motor controller chip, which unfortunately you can't buy and has Milwaukee's software programmed into it.
Do you have a link for the mosfets? I seem to be having issues locating some of them.
Try searching for IRLS3034TRL7P I know mouser and digikey stock them.
Are the mosfets a weak point in milwaukee tools? Great video I really enjoy watching them
Thank you. Really appreciate it!
Seems like it. I think people possibly jam the tools or put too much strain on them.
Hi I have a Milwaukee mitre saw 305. The problem is when I push the trigger. the light gets turned on but the saw itself doesn’t work!?
Do you think the fault lies in motor or somewhere else!?
Someone sent me the motor assembly out of one to have a look at, unfortunately what seems a common problem with these is the braking MOSFET fails and sends 18V into the microcontroller / motor driver chip and fries it. Unfortunately this isn't replaceable as it's a Texas Instruments part which they don't supply to the public, and it has firmware programmed into it that we don't have access to either.
That's a damn shame, but hey that's electronics for you , great vid... Mine wasnt working, stuck it on the floor of the ute for 3months , thought I'd have a look at it today , took the belt clip off of it , then thought hey I might try a battery on it , .. and boom. She's a goer 😁.. so yeah this video helped me fix mine 🤣 , god knows what was wrong with it , see how long she last 👍
Glad it was helpful! I actually repair this one in a follow up video as someone sent me a replacement controller board that I wire up to the motor board I repaired.
Mines now dead dead. Bought it, two projects around the house. It died. A few months later worked again; then died again and hasn’t worked since. Off to repair it goes. Thankfully still under warrantee.
I think there's a design flaw with the circular saws as quite a few people I've spoken too seem to have issues with them.
Great video! I have mine the front led light always on even when it's not in use... Do you have any idea why?
Thanks👍I would think it either thinks the power switch has been pressed slightly or the mosfet / transistor that controls the LED has failed short circuit (which would be a pain to get to as it's all encased).
It's so you can find it in the dark easier;) just add small switch to the handle to make it on demand then.
Hi ,i do not know if you can help me but i have a milwaukee impact wrench and ive noticed that the hall sensor as come off and do not know were i can get some from and it says on the top of it 5tey .and on my drill i need a W78J .thank you
Hi I've not looked at an impact wrench, but on I just had a look for hall effect sensors with those numbers and nothing came up. I know they use the DRV chips on the the saws and I've seen them in other tools. Perhaps these are the hall effect IC's are what they use? DRV5023AJQDBZR digikey seem to sell them around 75p each.
Thank you very much for your time and effort to help me . I wanted to send you pictures but I can not on here
You can email me at the channels name at out look dot com.
@BuyitFixit hi again I managed to fix it I tuck the surface mount hall sensor off another milwaukee 18v board the marking on the chip was different but it's all working fine and I've got the same problem with a milwaukee impact wrench missing hall sensor so I'm going to try it with the other two iv got left on that pcd .if I don't try I'll never no lol .thank you again for your help and sharing your Knowledge I love learning new skills
It's working great
I finally fixed my Milwaukee CCS66 circular saw.
I cannot believe what fixed it either, having stripped the saw down 3 times, & cleaned all the trigger connections inside checked & tested the wiring & mosfets etc & everything passing continuity tests with a multimeter, I did some more googling & people suggested cleaning the battery connectors fixed theirs.
Well I wasn't at all convinced as my connectors looked immaculate with no gunk or residue but I gave them a drenching with WD40 Contact Cleaner & a good rub with a cotton bud which only showed an absolutely miniscule amount of dirt on it I then inserted a battery & F*CK a DUCK it fired right up 😮
I am flabbergasted, but hopefully it might help some others with these cursed Milwaukee Circular Saws having the LED light up when battery inserted but no life out of the saw at all, as this is such a simple fix that doesn't even require open the tool & will cost less than a £tenner for some decent contact cleaner.
Interesting, I wonder if it's the terminals it uses for the battery temperature sense, as if it lights up it must be getting power. Thanks for sharing 👍
@@BuyitFixitAre you thinking if it cannot get any Temp data from the battery it will just refuse to start?
The motor circuit was definitely getting power as I tested it with a multimeter with a battery hooked up & pressing the trigger.
Yes, pretty much the only reason I can think of. I know the m12 flash lights alternatively and refuse to run if the temperature sensor doesn't give the correct reading.
Just to add another bit of information I have noticed, if you click the battery on & the LED instantly comes on the Saw will NOT work, but when I cleaned the battery terminals & clicked the battery the LED no longer comes on instantly & the saw fires up as it should when pressing the trigger.
With you skills extending into programming as well, don't you think you could create an open-source firmware to drive a simple motor at a constant speed?
It had crossed my mind, and I did look into OpenESC i think it was which is a brushless motor driver software. You would have to add a couple of other features such as battery monitoring, and control the LED but those would be fairly simple to do too.
@@BuyitFixit This would be epic
Hi I have a Milwaukee 305 m18 mitre saw dead could you fix
Someone sent me the insides of one before to have a look at. The mosfet that controls the braking had shorted and fed power back into the main chip and fried it. Unfortunately the chips aren't supplied to the public, and they contain software, so even if we could get the chips they wouldn't work as we don't have Milwaukee's code to program into it.
Ah that’s not good then thanks for your help and such a quick reply keep up the good work
Could you explain how you tested the mosfet? My small research on these explained there shouldn’t be any resistance/continuity between the drain and source pins. When you replaced with the new ones, it seems that with it read around .4 between the drain and source was good? Shouldn’t there have been no reading? Sorry novice learner here.
Theres a built in diode across. When mosfets blow they usually blow short. The meter was measuring the internal diode. You can also trigger the mosfet with a meter when testing it, and it will read short. They are a little awkward to test. Usually you get a short on the gate when they blow too...
@@BuyitFixit Thank you for the quick response! I’ll have to do more learning. Didn’t realize these had a diode. How can you tell? I was able to get mine fixed. Just had a ton of dust all over the circuit board and cleaned it off with a brush. Thank you!
If you look on the datasheet they usually have the diode marked
Hi, I have same problem, what number or reference are those mosfets please? Thank you so much
Hi Mauricio, the mosfets should be IRLS3034TRL7PP. Most of the Milwaukee brushless tools use this part. Hopefully it hasn't back fed down the lines and blown the control IC like it did in this one. I managed to get a replacement controller board / IC from someone and it did repair it in a follow up video.
@@BuyitFixit Awesome thank you so much. It seem it is only one Mosfet blown only but who knows you are right. It was running before it was taken apart anyway so hopefully it is nothing major 🤞Thanks a million once again for your help and video tutorial, much appreciate it
No problem, really glad you found it useful 🙂👍
So how come yours have the dust extraction on the side and you can use the vacuum. Is it 6 ½ blade saw? Are you in the USA?
Hi, the saw is the way it came with the dust extractor on. Yes 165mm I think it was. No I'm in the UK.
@@BuyitFixit because here in US we do not have that. I notice that UK and Europe have better stuff than we do here in USA. Thank you.
No problem. Glad to help 👍
People in us don't talk that way. Hi from Illinois
Hi from across the pond 🙂
I had a tech from Milwaukee tell me this happens because of the brushless electronics in the saw, the saw that has brushes does not have this problem.
The designs are totally different. You are correct the brushed one would not have this problem because it does not need a brushless motor controller.
I have M18 Miter Saw 10" that I tried to cut 10" treated wood but the blade got stuck. I foolishly continued to press the switch but it went dead. I read in a web that one person could remove dust or small particle and got it spin again. But when I contacted Milwaukee, they said once happened there is no fix except replacing the motor assembly. They did not say about trigger switch. Two lessons learned were; 1- this saw does not have "Overload Protection" and 2- Yes, Milwaukee will fix it after 5 years using Serial number. Unfortunately, my machine (2734-20) died after 5 years and few weeks.
Could you please show how to open and/or fix the motor assembly for this model? Thanks a lot. Your details make the show truely practical.
I did a follow up video on this exact saw where someone sent me a spare controller pcb (which is normally part of the motor assembly) and I repaired it.
Ok question is what type mosfet and how i can finder name of it to buy new mosfet
IRLS3034TRLPP I bought them from Digikey
I wounder if the second gen saws that are a problem, my first gen had for 9 years still working well
Interesting, could well be the case as I've seen quite a few broken ones on Ebay.
You win a lot of them, but you have to lose some mate. Quite an ordeal to strip that circular saw. Nonetheless, a very interesting video mate.👍👍
Thanks 👍but.... there is a follow up video 😂😂👍
I got exactly the same fault with my M18 CCS66 I thought it was a dodgy switch or connection as it would work fine for ages then stop but would work again with a bit of a clunk.
I stripped it down at the weekend cleaned the contacts & put it back together & it worked. BUT put it back in the van the next day & dead again apart from the LED 😡🤬
Got to be honest I got a lot of Milwaukee cordless kit & it is NOT worth the price premium. They seem particularly bad at switches as their drill switches die often also.
The other annoying thing is in the US they get 5 year warranty we only get 1yr with extra 1 or 2 with registration.
Yes, someone mentioned about the 5 year, and it sucks as you say how we only get a year or 3 at most...
I have a similar prblm with mine it was maybe 14 months after i bought it. Went to use it in the spring and it didn't work? Then after 2 months i tried it again and it was fine. Now i just used it a week ago and it's still working but just tried it again yesterday and nada. It's dead again even after putting in fresh battery? Are they making junk now, i paid over 100 dollars for mine!
Yep, I agree with that. I think the saws aren't up to the job. I've got another one that I bought new and it's acting itself and works intermittently. I think it's the microcontroller combined with a motor driver all on the same chip that is failing.
@@BuyitFixit I wonder if the standard model with the brushes maybe work better?. I think the brushless motors have more circuit involved? How can they keep making this junk
I've had mine since 2014 still working great except down bit on power under load because it was used on hardwood.
Bought another one second hand good price so far so good
Merhaba tamir oldu mu? bu makina mosfetleri değiştirince
Bu durumda patlayan mosfet, gücü ana mikro denetleyiciye geri göndermişti, bu nedenle sadece patlayan mosfeti değiştirmek sorunu çözmedi. Bir izleyiciden yedek kontrol panosu almayı başardım. Bunu birkaç aletle yaptım, bu sadece çipe çok yüksek bir voltajın geri gönderilip gönderilmediğine bağlı.
Hello Buy it Fix it, where can I buy these mosfets? Which part number? regards Wassili
I ordered them from Digikey. The part should be a IRLS3034TRL7PP. Hope that helps 🙂
I have the same saw with same problem
I did a follow up where I did get it working, but not without a replacement microcontroller board which came from a donor saw.
hi, can you help me please, from where, we can find this mosfet. i couldn't even find online
Try searching for irls3034trl7pp
I have a simular circular saw and i have 320N4Fb mosfet from brand ST but i cannot find this mosfet on web. Is it possible to chane it to IRLS3034trl7p as a replacement part?
Just had a search for you. I think you are looking for a STH320N4F6-6 👍
Yes i have looking for this part! Thank you for your information!
I have one more question. Does anybody know what's the replacement part of the hall sensor? Because on the top of my hall i can read "5TEJ" and i cannot find this part. Or i can replace any hall sensor wich operates 3.3V?
You're welcome 🙂. I can't find any hall effect with the number you gave. Are you sure it's a hall effect sensor? smd.yooneed.one is good for searching codes but that code isn't listed.
I'm from Russia, I bought 2 tools m12 2553, this is an impact driver, I bought them already broken, I fixed the first one in 20 minutes, there was a drop of solder on the legs of the motor driver, the second one I try to revive sometimes by measuring everything I can measure on its board 😂 It is not possible to find a datasheet or any information on this drv. The only thing I could find was a guy from China who wrote that this is confidential information and he cannot share it because he signed an agreement. It's a shame that Milwaukee doesn't give you the opportunity to repair their instrument, but it's good that they didn't put transistors inside the driver chip 😂😂🤣
Hi,
Thanks for your comments. Yes you can't find much information on this driver chip, all NDA. I did have the idea of creating a replacement board based on something like openESC which could drive the motor, but I haven't looked into it any further. I think it would be a good solution and could be used for other tools too.
What is the part number of those mosfets ..
I usually put it in the video, but I might not have this time. Most of the Milwaukee tools use a IRLS3034TRL7P.
Happened to mine..replace blade regularly and it’ll work forever
Great post, thank you
Thanks Pitchfork Pilot
Well , a great try!
Thanks Tom👍I did a follow up video on it a couple of weeks after doing this video as someone I know sent me a replacement motor controller board 🙂
Sadly looks like one for the f*ckit bucket. Or wait for another broken one to come up for sale... 🤣
Yes unfortunately :( I have had an offer of some broken electronics from another unit, so I may do a re-visit video or part 2 at some point.
Kunnen wij samen werken ik heb werk voor jauw?
That‘s Milwaukee. DIY quality with a Big Price Tag. Only LED and no motor trying to run - not worth opening.
Yea i feel it
Pisspoor effort from milwaukee, they need to be accountable for it
With the number of Milwaukee products that you feature on your channel I don`t think I would purchase any Milwaukee product
If I was purposely going out and buying broken Dewalt tools to add to my collection you would end up thinking that about Dewalt, but I already had some Milwaukee tools and thought I'd save some money by buying broken ones and repairing them.
It would be boring if he only fixed the running ones. They are mechanical tools due for mechanical break down they are not flawless.
Working on 1 that looks new & has power to the motor , led lights & that is all that happens. Trigger isn't the problem, when triggered, power sent to the motor , it was bought for diy & has only been used on 2 projects, & FAILED pisspoor Milwaukee
Yes the saws seem a bit problematic, I've seen a lot of failed ones on eBay. Possible some design issue and not the best product I think. Some of the other products like the angle grinders and impact drivers I've not had any issues with.
Motor, module and switch assembly but too high price
Agree. Too high a price for spare parts unless you can replace individual components.
Really? How much?
U.S. $150 to 240 for brushless motor with PCB and switch assembly
For a BLCS66
Milwaukee Electronics
Product Reference: 4931465887
£132.99 Inc VAT but you can get a whole new saw for around £149 on Amazon!
Motor with PCB and switch assembly but too high price for milwaukee m18 and dewalt 20v & 60V circular saw, reciprocate saw, chainsaw and right angle drill
The same fault of this device is on,, Daniel Rakowiecki" Chanel.
I did a follow on video on this a few weeks later and repaired it after someone sent me a spare microcontroller part.
@@BuyitFixit what about programming?
It was a used board microcontroller board (not just the chip) from a broken saw (but the chip hadn't fried) so it was already programmed. I had thought about designing my own board as a replacement for these as it seems a common problem.
They seem very fragile for such expensive tools.
Yes, agree.
Guess I’m throwing mine away 😂
Depends if the main controller is fried. If it's just the mosfets it's repairable. I did get a replacement control board from a viewer and used the motor board I repaired and fixed it in a later video.
Milwaukee it’s a Shi….brand, I had problems with batteries, charges and saw, never again.
Some stuff isn't great I must admit. The grinders and impact drivers I've not had a problem with.
trigger problem ,i fixed my like two weeks ago.
Well done. Glad you got yours working. Switches seem to fail on these often too! On this one the microcontroller was faulty as when the mosfets failed they backfed voltage into it. I did fix this one in a follow up video as someone sent me a replacement microcontroller from a donor machine.