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Maytag Dryer MDE8400AYW  Rate Topic 
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 Posted: Thu Mar 11th, 2010 10:46 pm
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Master Brian
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I have had this dryer for about 4-5yrs and some time ago, it stopped sensing when clothes were dry and the timer wouldn't advance.  This has the intellidry feature. 

Today, I went looking for the problem, I pulled the sensor out of the cabinet and cleaned the contacts, as they were dirty, then I lifted up the control panel and pulled out the sensor assembly for chime and dryness.  Well, it appears a transistor partially exploded/blew out.  A corner is missing and there is a black spot on the white housing for the LED lights.  Then on the printed side of the board several areas of the solder path are missing.  Mainly from the plug to the resistor that apparently had an issue. 

Obviously this needs replacing, but the question is, what might have caused this?

I'll try to look at the schematic and see what goes to that wire on the plug and post back, but anything else to look for in the meantime?

The dryer still dries, it just won't advance the timer and the sensor lights always show wet clothes.  I don't know if it will advance on timed dry, I'm trying to contact my wife to see if she knows.  I just don't do laundry and this has been an issue for some time, I was just waiting to repair until we moved the laundry room to the basement....

 

Thanks

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 Posted: Thu Mar 11th, 2010 11:27 pm
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dekostop
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hard to say what caused it.  possibly a powersurge or shotty soldering from the manufacturer. most likely the timer will advance during the timed cycle.

i think just replacing the part should fix the problem. i would not worry too much about it.

tim

 



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 Posted: Thu Mar 11th, 2010 11:48 pm
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Samurai Appliance Repair Man
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Can you post some good, closeup pics of the burnout, front and backside? Might give some clues as to what on the board failed and why. Use a free photo hosting service like Flickr or Photobucket and post the link here.



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 Posted: Thu Mar 11th, 2010 11:54 pm
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Master Brian
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Ok, I checked on what the wire, it was a brown wire and it goes to the timer. 

Tim, I wish I had read your reply a bit sooner, as I was curious if something inside the timer was also fried.  Well, being the curious guy that I am and having to know how everything works, I pulled the timer apart!  Bad move, lots of levers and a couple of gears that came loose.  I will say after about 30minutes studying it, I would say I am 99.99% sure I got it back together correctly. 

The question that begs is....did something, like a gear, move to a position that will throw everything off!  Time to go hook it up, with the faulty part still hooked up and see if the timer appears to work.  At least as good as before, meaning it turns on at the correct spots and off at the correct spots.  If so, I'm going in the moring to pick up a new "dryness" board for $30, if not, I guess I'm also spending $80 on a new timer as well...  Lesson learned!:?

The good news is that there is nothing inside the timer that could have fried from the part that went bad. 

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 Posted: Fri Mar 12th, 2010 12:43 am
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Master Brian
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Here are the pictures.  The yellow circle shows what I believe blew up.  I believe that is a resistor.  You can see the corner missing and the burnt on the white of the LED housing.  The blue arrows show the circuit that went bad, the blue arrow with the "?" looks bad in picture, but it's back in dryer for now testing the timer out.  Which for what it's worth, turns on and off in the correct positions, but my wife told me that since the dryer stopped sensing dryness and advancing the timer, she has tried all settings and none advance.  I have the drier running for the past 15minutes to see if the 10min setting turns off.  Time to go check that....

Thanks for the help!




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 Posted: Fri Mar 12th, 2010 12:55 am
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Master Brian
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For what it's worth, I ran the dryer for about 20min+ on the 10minute timed dry setting and it did NOT budge the timer, just like my wife said.  I also double checked the ciruit board and the only bad circuit I see on the back is the one from the plug to the resistor.  The arrow with the "?" appears good.

Below is an updated pic of the back of the board showing what where the resistor is and where the plug is.

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 Posted: Fri Mar 12th, 2010 02:06 am
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Samurai Appliance Repair Man
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Good pics! Couple questions:



and




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 Posted: Fri Mar 12th, 2010 03:12 am
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Master Brian
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Under the white "what's under here?" part are the red, yellow and clear(blue) LED lights that you see at the top of the backside of the circuit board picture.

 

I wondered about the Diodes as well, but couldn't tell clearly.  I'll go take another look and see.  If you look at the back of the circuit board picture on the upper left hand side you can see 3 solder joints just to the left of the clear/blue LED, that's the solder connection for the diodes.  From that pic they even look a bit overheated!  Again, I'll take another look!

As for the charring and the Burnt IC chip, I believe what happened is that th transistor or resistor (whatever it is) overheated and exploded.  It doesn't appear that bevel, you circled in red, is supposed to be like that.  If you look at the bottom edge of that corner, you can see where it appeared to "blow out".  That is what I believe caused the charring and the damage to the IC chip.  Must have caused a very hot flash!

That really is why I wonder if I should look at something else, like possibly the timer, but the timer doesn't have any real circuitry to it.  That is however what this burnt circuitry went to...

Trying to remember back, but not long after I bought this house, I had a wire, which may have been the 220 for the dryer short across in a junction box.  Electrician fixed it, then I had the entire service to house upgraded from 60amp to 200amp and almost all new wiring installed.  Like I said this has been a "broken" item for a while now, I just waited to repair until I moved the laundry to the basement.  I just can't recall if this happened that long ago or not.  It's been about 2yrs since we moved, about 18months since the arcing in the junction box.  Could that have caused this???

 

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 Posted: Fri Mar 12th, 2010 03:17 am
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appl.tech.29501
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if there weren't any bad contacts in the timer i would just replace the dryness control...its common for them to go out.



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 Posted: Fri Mar 12th, 2010 06:22 am
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Master Brian
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Yes, it looks like the diodes took a hit as well. The area definately appears discolored and the solder joints as well as the leads coming out of the diodes look as if they got hot...

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 Posted: Fri Mar 12th, 2010 11:00 am
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Budget Appliance Repair
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Master Brian wrote: Trying to remember back, but not long after I bought this house, I had a wire, which may have been the 220 for the dryer short across in a junction box.  Electrician fixed it, then I had the entire service to house upgraded from 60amp to 200amp and almost all new wiring installed.  Like I said this has been a "broken" item for a while now, I just waited to repair until I moved the laundry to the basement.  I just can't recall if this happened that long ago or not.  It's been about 2yrs since we moved, about 18months since the arcing in the junction box.  Could that have caused this???

That very well could have caused it.  By shorting the wires, depending on what you did you might have sent 220volts thru the dryness control board and blown that transistor out with a nice big burst of lightening.



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 Posted: Fri Mar 12th, 2010 03:16 pm
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Master Brian
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Budget Appliance Repair wrote: Master Brian wrote: Trying to remember back, but not long after I bought this house, I had a wire, which may have been the 220 for the dryer short across in a junction box.  Electrician fixed it, then I had the entire service to house upgraded from 60amp to 200amp and almost all new wiring installed.  Like I said this has been a "broken" item for a while now, I just waited to repair until I moved the laundry to the basement.  I just can't recall if this happened that long ago or not.  It's been about 2yrs since we moved, about 18months since the arcing in the junction box.  Could that have caused this???

That very well could have caused it.  By shorting the wires, depending on what you did you might have sent 220volts thru the dryness control board and blown that transistor out with a nice big burst of lightening.

I'm hoping that was the culprit, but I just can't recall when this started and if the two are related and neither could my wife.  The electrician asked if we were trying to burn the house down and it does seem like there was a burnt smell coming from somewhere....I just can't recall if it was from the laundry or the junction box the wires shorted out in!  Gotta love old spliced together wiring!!!  (and no I didn't do it, I just bought it)

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 Posted: Fri Mar 12th, 2010 07:07 pm
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Master Brian
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Well, I picked up a new dryness/chime board for $30 and so far so good. It chimed, the dampness indicator changed as drying progressed as did the timer on the intelli dry settings. Haven't tried timed drying yet, but I'm keeping my fingers crossed. Now I just have to find the time to pull the back off to vacuum this beast out, lots of dust, lint, etc...

Thank you so very much for all the help and feedback!

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 Posted: Fri Mar 12th, 2010 08:49 pm
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appl.tech.29501
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"Now I just have to find the time to pull the back off to vacuum this beast out, lots of dust, lint, etc..."

Your better off going through the front so you can clean the front bulk head out(filter housing).



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 Posted: Sat Mar 13th, 2010 01:32 pm
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Master Brian
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ok, thanks

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 Posted: Fri Dec 6th, 2013 11:18 pm
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Master Brian
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Well, I'm still having issues with this, so I'm now deciding it is likely something else that is causing this board to blow out as I've gone through about 3-4 more of these since starting this thread. They generally had been lasting about a year, but I believe I've replaced 3 this year alone. I posted somewhere else online about it and came across something mentioning there are 3 versions of this model of dryer. Since I can't find where I last posted and thus can't find another article about this, I'll post what I recall.

There are supposedly 3 versions of this dryer and I apparently have the version that uses the timer from another version. Still with me? Well, I called an online appliance parts place and they have 3 timers, took my serial no. and told me which timer I needed to get. I have yet to compare that with my timer, but I'm curious what others think and/or have had experience with.

I was thinking I had replaced this timer at one point, but after re-reading my post above, I guess I just pulled it apart and put back together. Hmmm.... When the board blew last night, I had moved the timer from less to more dry and when I went to re-start I saw the board flash and go out. One concern I had is I was getting shocked by everything, so apparently the cold dry air has caused a lot of static. Is it possible I gave a static shock to the dryer and zapped that board? It's grounded, so wouldn't think likely, but then again....

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