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Dryer malfunction

fprs

May 29, 2015
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20150529_113400.jpg 20150524_215712.jpg My dyer lights up when it's plugged in. However, nothing happens when i press the start button. I'm unsure to what is causing this problem, so any ideas are welcomed. I took it apart (warranty expired a long time ago), and everything seemed normal except the control board on the front of the machine. It seems to have some burns on the board, and I just want to make sure that this is the problem. I have attached a picture showing the area where i think is damaged.
 

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shrtrnd

Jan 15, 2010
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I would think your evaluation is pretty good.
Burned areas on a board mean over-heated and likely damaged components.
Are you intending to find an entire replacement board, or do you have skills in troubleshooting and identifying damaged components?
It's often much cheaper to identify and replace electronic components, than to buy an entire new board.
But you need some electronics knowledge to do that.
 

Tha fios agaibh

Aug 11, 2014
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The discoloration may be just heat dissipated from a resistor.
Or, is that a shadow?
I'd be more concerned about the corrosion on some of the tracers.
More pics would be helpful.
 

fprs

May 29, 2015
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There are no shadows in the picture taken, the dark marks are from the board itself. I will send pics as soon as I can. Can you explain what you mean by "the corrosion on some of the tracers". Thanks for the observations.
 

Tha fios agaibh

Aug 11, 2014
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The reason I think its a shadow (from camera) is because the darker area is almost in a perfect line across. Discoloration is usually not so uniform.
There are corroded tracers (lines) at the top of picture. You can try and clean it up with a pencil eraser and see if the copper is still intact. You can also check with a dvm for continuity between nodes.(solder points)
 

davenn

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Sep 5, 2009
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I don't seen any burn or even any slightly overheating marks
I also see a good shadow .... photo it from a different angle

the gunge across the top edge is just solder flux residue
show us the other side of the board
 

davenn

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Sure looks like corrosion to me.
I'm guessing exposure to water caused this board to fail.

Im not saying it definitely isn't corrosion

But I see it on boards often
if it really was moisture corrosion, then I would expect to see burnt/damaged tracks in that area
and there is no sign of that

D
 

Tha fios agaibh

Aug 11, 2014
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Im not saying it definitely isn't corrosion

But I see it on boards often
if it really was moisture corrosion, then I would expect to see burnt/damaged tracks in that area
and there is no sign of that

D
Your probably right, although water could cause a failure without that kind of damage. Right?
I'm picturing rogue currents that might take out an IC or something, without drawing too much current.
 

fprs

May 29, 2015
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Here are some more pictures. Should I consider replacing the board?
 

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Tha fios agaibh

Aug 11, 2014
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You didn't show us the other side of the board, clean up the the tracers nor report on the continuity of the traces.
I (for one) can't tell you if the board is bad or not, because I have no idea what its function is, or the associated circuitry. Maybe, if you can show a diagram, or at least close-up pictures, someone here can give you some guidance.
 

davenn

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You didn't show us the other side of the board,

Yeah ... I asked him to show us the OTHER SIDE of the board some posts ago

The one thing the new pic does show is that there was as suspected a big shadow across the board
that was causing an irrelevant side issue

Dave
 
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fprs

May 29, 2015
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Here are some pictures of the front of the board. Sorry, I forgot to explain what the board was for. Is it the board which has the knob for the mode preset ( 20 mins, 40 mins, extra care, etc). The white part is where the knob fits and turns. I tried cleaning the corroded tracers with a an eraser, but barely any of it came off. I do not have access to a DVM, so i am unable to test the continuity of the tracers. Feel free to ask for more pictures, i apologize for the bad quality. What else should i check inside the dyer which could cause the malfunction?
 

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Tha fios agaibh

Aug 11, 2014
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The selector switch under the metal shroud might have a bad contact. (?)
Making certain any exposed wiring or parts are insulated (not going to short) and wearing insulated gloves, I would try powering up the washer and try rotating the selector knob while trying the start button. (If you feel confident) You may also try banging on the switch to see if it will start. I assume the fill portion of the washer works, and the water comes up to the proper level? If not, you might have a bad solenoid or level sensor.
 
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