Samsung microwave oven , start button wont work , MC28M6055CW, try this workaround
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- Опубліковано 19 січ 2025
- This work around should fix the very common fault on a lot of Samsung microwave ovens using control panel DE92-02726 due to the replacement part needed been no longer available . Symptoms are start button not working , fault could be intermittent and some other buttons can also stop working.
Another genius workaround from Michael.
The fact that the display is no longer available shows the high failure rate.
Samsung gear is not what it used to be.
cant understand why its no longer available as this one was not that old , unless of course they have a load of new boards they want to get rid of .
@@michaeldranfield7140 Probably, Samsung like a lot of other brands no longer keep any depth of spares.
All they want is to sell a new Microwave.
Exciting as always. It feels like a crime scene investigation.
Your a master of fault find and solutions.well done
sometimes its the only way .
That was an L of a mod Michael 😂 (sorry, had to). Absolute wizard of an idea though. Still the master !!
Thankyou
hello I had the same problem for some time, the board was waiting for repair on the shop shelf without fixing the problem. The problem was solved with this trick. Thank you very much for this tutorial. It was very very good
Could be moisture ingress causing the leak? And if it's been standing for a year, any moisture would have evaporated probably.
Most likely you're right. The newer display probably has better sealant.
I've found that moisture on PCBs in radios and kitchen scales can cause mayhem with buttons and rotary encoders. A good clean around with IPA works wonders.
it could be
Well done Michael you are a clever chap who certainly don't give up easily, I really enjoy your videos and learn a lot.
A while ago I spent some hours investigating a similar non start Samsung Microwave. Not having the circuit or knowledge of relay operations etc I tackled it by visual inspection, re-making various soldered joints, substituting a start switch and latterly substitution of a couple of relays. At some point it started to work again - but not reliably. On days when it failed I left it unplugged overnight and if it worked the next day I would carry on using it on a daily basis until it failed again. Eventually it fixed itself so I was left wondering what was the cause of the problem and expecting the problem to return. I believe in a previous video you mentioned it might be connected to leakage from the display. So when it was not in use I have been disabling the display by pressing the Eco button. I will check to see if the display has ghost L's but will dig out and fit the diodes.
I wonder if it might be the display is overdriven , I did notice a couple of segments were just a little dimmer than others but not enough to show on camera and this could indicate low emission of the led but time will tell.
wow that was a great piece of diagnostic work, a shorting out display causing it to go into a lock mode ,the clues are there , thanks Michael😊
Isn't it a leaked display causing the MCU multiplex to fail to read the keypad buttons?
*leaky
Well done Michael - good fix
Thankyou
Very good fix .Cheers from Australia.
thankyou
Not sure quite how you figured out what the problem was, but nicely done. You could have bent each of the five retrofit diodes into a "Z" of sorts before fitting them, which would make access for soldering a little easier.
He’s a genius that’s why. He’s also done another video on diagnosing clock signals on these.
Yes , got to be an easier way, wouldn't have been a problem if the diode was soldered to the other side of the board .
Nicely done Michael. What lead you to this (correct ) guess ? I know decades of experience (same as me in IT), but was there something in the past?
To me this is almost like an early start to the Royal Institution Christmas Lectures :) So Happy Christmas too, just a bit early .
two things , a comment someone made on my other video about the possibility of the display been the cause and the fact I had repaired an instrument cluster for a fiat 500 a few months before where lights where flashing on the dashboard when the car was indicating left and it turned out to be a Leakey LED in the cluster .The LED was lit but passed a current both ways .
@@michaeldranfield7140 Ta! So once again in life, its a hunch from a different (same) discipline.
👍👍👍
I got one similar.. loads of issues, dirty ribbon connector, water ingress under the plastic button strip. and the timer knob needed a clean.. all ok now and fixed free.
👍
Thanks sir❤❤
cool!
funny how the warranty runs out the day before it breaks down,,Michael theyll be paying not to make these vids lol 👍
what got me thinking was this , its ok fitting a brand new board but as this was only just out of warranty there is a good chance a new board will only last as long .
@@michaeldranfield7140 very true fit new board mmm can you smell smoke ?💥
My Samsung start button doesn't work and I have not cooked the Christmas cake yet erhhhh