Diagnosing And Fault Finding A Dead Milwaukee Circular Saw / PCB Repair. 

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!

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 👍😊

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.

Very helpful, thank you!

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.

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.

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.

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 👍

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.👍👍

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 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.

Are the mosfets a weak point in milwaukee tools? Great video I really enjoy watching them

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.

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.

Do you have a link for the mosfets? I seem to be having issues locating some of them.

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.

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

Great video! I have mine the front led light always on even when it's not in use... Do you have any idea why?

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.

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!?

Hi I have a Milwaukee 305 m18 mitre saw dead could you fix

I have the same saw with same problem

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 😂😂🤣

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?

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.

Great post, thank you

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?

Ok question is what type mosfet and how i can finder name of it to buy new mosfet

I wounder if the second gen saws that are a problem, my first gen had for 9 years still working well

Hi, I have same problem, what number or reference are those mosfets please? Thank you so much

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!

Happened to mine..replace blade regularly and it’ll work forever

Hello Buy it Fix it, where can I buy these mosfets? Which part number? regards Wassili

Merhaba tamir oldu mu? bu makina mosfetleri değiştirince

Sadly looks like one for the f*ckit bucket. Or wait for another broken one to come up for sale... 🤣

hi, can you help me please, from where, we can find this mosfet. i couldn't even find online

What is the part number of those mosfets ..

Well , a great try!

That‘s Milwaukee. DIY quality with a Big Price Tag. Only LED and no motor trying to run - not worth opening.

With the number of Milwaukee products that you feature on your channel I don`t think I would purchase any Milwaukee product

Kunnen wij samen werken ik heb werk voor jauw?

Pisspoor effort from milwaukee, they need to be accountable for it

The same fault of this device is on,, Daniel Rakowiecki" Chanel.

trigger problem ,i fixed my like two weeks ago.

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

Motor, module and switch assembly but too high price

They seem very fragile for such expensive tools.

Guess I’m throwing mine away 😂

Milwaukee it’s a Shi….brand, I had problems with batteries, charges and saw, never again.