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dagnabbit
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Posted: Sun Jul 22nd, 2007 21:13 |
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Our Maytag Neptune gas dryer (MDG5500AWW) dryer started shutting down. And when I say shut down, it completely powers down. We took it apart and cleaned everything there is to clean. I also look on the circuit board- the four larger (1 watt, I think) resistors have definitely overheated, but not blown- you can see the circuit board has browned in that area. I removed the resistors and checked their values, they're all 820 ohms (I think that's the value they're supposed to be). We reassembled the dryer, went into diagnostics mode- no error codes were shown. Put a full load in and ran it on sensor dry. It ran for about 30 minutes, and then beeped and switched to wrinkle release. Tried to switch it back to sensor dry, and the dryer shut down. Left it for half an hour to cool, ran it on timed dry, it ran for about 30 minutes and then shut down. Without letting it cool, it will run for about a minute and then shutdown. While still in it's "hot" stage, went into diagnostics mode- no error codes. From previous posts on similar symptoms, I'm suspecting either the motor thermal shutdown, or the hi-limit temp switch. I am definitely concerned about the resistors on the circuit board. I don't have a schematic for it, and I have not sat down and done a trace yet to find out what the heck these resistors are there for. In my experience with other electronics (I'm a network engineer that used to be an electrician in the Navy for some years), resistors go like this when something else fails and starts feeding more load to the resistors than they can handle... either that, or the resistors are underrated in terms of wattage. I don't think there's anything I can do about the motor thermal shutdown switch except replace it- I'm not sure how to test it except with a multimeter and a propane torch. Same goes for the hi-limit switch. I'd sure appreciate any input!
Thanks!!
Ben
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Moostafa
The Ayatollah of Appliance Repair
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Posted: Tue Jul 24th, 2007 00:51 |
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| Hello, my powered down friend. When the dryer "shuts down," as you say, is the control panel still active? If so, then your investigation consists simply of determining whether or not the motor is receiving the supply voltage, typically 120 of your Ameedican volts, to its start winding when you press the "start" button on the control panel.
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dagnabbit
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Posted: Tue Jul 24th, 2007 03:12 |
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When I say the dryers dhuts down, I mean the motor stops, the lights go off on the control panel- but there's still power to the control panel, becuase I can start it up again (although it'll only run for a few seconds to a few minutes). Sounds like a motor termal trip to me! Yes, I bought a new motor, replacing it tomorrow. Hopefully, I'm right.
I'm still concerned about the resistors on the control panel circuit board. I guess they were part of the holding relay for the motor "on" circuit? Makes sense to me- if the motor is overhaeting (and drawing more current), the motor power relay and anything associated with it are going to enjoy that increase in load. has anyone else seen this? Should I go ahead and replace those four resisters just to make sure?
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dagnabbit
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Posted: Wed Jul 25th, 2007 19:10 |
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OK, just replaced the motor. Same thing, shuts down after a few minutes. Checked ventillation, made sure all hoses were clear and freeflowing. If it's not the motor tripping offline due to overheating and/or overload, what then? The power relay on the control panel circuit board is bad somehow? HELP!
Thanks.
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Trying to help
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Posted: Thu Jul 26th, 2007 03:08 |
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| Let the unit run in time dry. Say 40 minutes. Will it complete the 40 minute time dry? If it does complete it, can you then restart it immediately?
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dagnabbit
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Posted: Thu Jul 26th, 2007 04:54 |
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Nope, won't complete 40 minutes- husts off at about 8 minutes. Can restart right after it shuts down, only runs about 5-8 minutes. No error codes show up in diagnostics mode.
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Trying to help
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Posted: Thu Jul 26th, 2007 13:44 |
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| I should of asked this in the prior note, in time dry does it jump down and shut off at 0 or is it counting down correctly minute at a time and shutting off at say 32 minutes left in the display?
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dagnabbit
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Posted: Thu Jul 26th, 2007 14:30 |
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It's counting down correctly and shuts down during its countdown- no beep or anything. It does not jump to zero.
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Trying to help
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Posted: Fri Jul 27th, 2007 01:06 |
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| The fact that the unit is loosing the display when it shuts off rules out the motor. If it was the motor kicking off on overload, the time would remain and would continue to count down, just no motor operation. It sounds like your board is either loosing power or is bad. I would unplug the unit and inspect the connections at the line cord coming into the unit looking for loose connections or burns, then if that is fine, I would monitor the voltage making it to the board and monitor as it is running to see if it drops when the unit stops. Another thing you can try to maybe point us in the correct direction would be to start the unit and let it run for a minute or two then unplug it and plug it back in a second later. Does the board get a PF for power failure or does it go back to the time. ( I do not know what the software of this board is supposed to do when it looses power. This might give us a clue to what is going on)
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dagnabbit
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Posted: Fri Jul 27th, 2007 14:22 |
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When the dryers shuts down, the control panel goes to "18" displayed on the LED display, and the system switches to Wrinkle Release. Not running, but that's what lights are on.
I haven't had time to put a mulitmeter on it while it's running. I think the system board is about to get replaced- I wanted to troublehsoot this down to the component level, but time=money and I'm out of time. I might check the motor relay on the board- but without a convenient replacement for that relay, I'm still just verifying that something on the system board is bad and needs replacing- and there may be other issues with other components that may surface becuase the relay failed (it's obvious that the four large resistors took a hit becuase of this, no telling what other small SMD componenets might also have been affected). Might as well swap it out wth a new one. Bummer- that's a good chunk o' dough.
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Posted: Sat Jul 28th, 2007 04:06 |
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| I hope that is it but I have some reservation (and they are not for dinner). You state the wrinkle release comes on and 18 is in the display. Wrinkle release is not an option or a cool down. It is a cycle. and it lasts 18 minutes, almost sounds like the TP is shorting and selecting it. If you walk up to the unit with it not running and open the door, what cycles does the board light up with? It should show the last cycle and the options the unit was allowed to complete. What does yours say??
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dagnabbit
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Posted: Thu Aug 2nd, 2007 03:29 |
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I think I put some misinformation here. When the dryer shuts down, all lights go out on the control panel, no buzz, nothing. Just off. If you hit start again (not chosing a cycle or anything) , the number 18 shows up, and the wrinkle release light comes on. The motor starts and runs for anywhere between 30 seconds and a few minutes. If you choose another cycle, the heat will come on (if the motor runs long enough). If you unplug the dryer, and plug it back in, and start it, you don;t see the PF come up on the LED display. We've gotten that before when we've had power failures. It's not doing that now. We've tried running the dryer on all cycles- timed, air fluff, etc, and the motor runs from anywhere between 30 seconds and a few minutes.
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dagnabbit
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Posted: Sat Nov 3rd, 2007 18:01 |
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Alrighty... after many months- we've bought a new house, and bought a new circuit board for the dryer. So, we plug it in... no "PF" on the LED display (which I'd expect for a power failure, but whatever), went to Wrinkle Release, 18 minutes. And it's beeping. Trying to figure out the pattern.... 3 quick beeps, then silence (long uncomfortable pause), then 5 beeps, then nothing. Then 3 beeps... bizarre.
We've hooked it up, put it on Timed Dry, adn running a test. This has to work- new circuit board, new motor, relatively new ignitor- what else is there? Door sensors and terminstors keep it from running at all, not get weird and bizarre. I get enough of that from servers and networks.
I need beer.
Thanks,
Ben
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wagstdy
Apprentice Appliantologist
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Posted: Wed Aug 27th, 2008 22:42 |
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I'm almost a year late....but I just joined the forum.
What's the verdict? Did the new board solve the problem?
I have the same problem with the overheated resistors on my board and am curious what causes it and whether or not mine are truly fried because my dryer still works. I also have black smoke stains on the white plastic under/behind those resistors.
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dagnabbit
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Posted: Thu Aug 28th, 2008 00:50 |
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The new board did solve the problem, of sorts- the new board is a more recent version, and there's something slightly different with the programming. At random intervals, the dryer will start beeping... 2 beeps, then three, maybe four, back to three... number and pauses are random... and then it stops. Minor annoyance. And recently it stopped working again. Started working after I put it into diagnostics mode (where it showed no error codes), checked all of the hi-temp sensors, door switch... everything there was to check. It then started working again.
I'm going to get as much mileage as I can from this pig, then ditch it like a bad check. And never buy a Neptune again.
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Robin the Hood
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Posted: Thu Aug 28th, 2008 03:19 |
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dagnabbit wrote: I'm going to get as much mileage as I can from this pig, then ditch it like a bad check. And never buy a Neptune again.
That probably won't be an issue, since the Neptunes are now "Out of Production". Have been replaced by the new MAYTAG EPIC series.
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"If you want your tree to produce plenty o' fruit, you've got to cut it back from time to time. Same thing with your neural cells. Some people might call it brain damage. I call it prunin'".
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dagnabbit
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Posted: Thu Aug 28th, 2008 04:12 |
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Epic eh... this has already been an "Epic"... don't need another one!
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Robin the Hood
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Posted: Fri Aug 29th, 2008 01:11 |
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"If you want your tree to produce plenty o' fruit, you've got to cut it back from time to time. Same thing with your neural cells. Some people might call it brain damage. I call it prunin'".
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