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Author Topic: Samsung dryer, frustrating  (Read 6196 times)

Offline Joeyt56

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Samsung dryer, frustrating
« on: March 01, 2017, 09:41:51 PM »

Working on a samsung dryer no heat. Checked everything. I get 110 volts on one leg to the heater but I lose the other 110 volts coming through the relay on the board. If I unplug and by pass the relay the heater works fine. So it has to be the board or the thermistor.  Since the resistance of the thermistor is around 10,000 ohms at room temp its checks out good. Had one on my van so changed it out anyways and no chang. Also checked the harness from the thermistor to the board and its good as well. So i replaced the board with no luck. Again i check everything. Order a new board and again no heat. What the hell is going on? Could the userinterface be causing thks somehow? Model#dv45h7000ew/a2

Offline dentdaddy

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Re: Samsung dryer, frustrating
« Reply #1 on: March 02, 2017, 06:51:03 AM »
I had one of these too. It turned out to be the centrifugal switch in the motor. Attempting to attach a pic. You can bypass the switch by jumping these 2 outer wires on the board. There is a 3 wire molex in the corner of the main PCB, jump the brown and black wire (2 outer wires. If heat works, replace the motor.
Good work isn't cheap. Cheap work isn't good.
SW Oklahoma

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #2 on: March 02, 2017, 07:49:37 AM »
I had one of these too. It turned out to be the centrifugal switch in the motor. Attempting to attach a pic. You can bypass the switch by jumping these 2 outer wires on the board. There is a 3 wire molex in the corner of the main PCB, jump the brown and black wire (2 outer wires. If heat works, replace the motor.

When the motor is running I get 120 through it to the heater. The other 120 I'm losing at the heater relay at the board. If I jump the relay then the heater works normally.

Offline Chris042281

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Re: Samsung dryer, frustrating
« Reply #3 on: March 02, 2017, 02:48:45 PM »
The motor has two switches on it.

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #4 on: March 02, 2017, 09:31:10 PM »
The motor has two switches on it.

Does the motor tell the main control to close the heater relay? Because I have pin pointed the heater not coming up because the heater relay on the main control will not close to allow power through. Again when I jump out the relay the heater and everything else operates normally. Which means the motor is allowing power through which I have tested already. 120 volts comes through the motor to the heater and the remaining 120 volts to power the 240 v heater is supposed to come through the main control board through the heater relay. For some reason the heater relay will not close. What is the second switch your referring to? Does it signal the control board? The centrifugal switch is the only switch I know and is what allows power to the heater and is operating correctly.   

Offline schleven

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Re: Samsung dryer, frustrating
« Reply #5 on: March 04, 2017, 02:35:16 PM »
I have seen a few lately that had bad switched in the motor. Here's a pic of the switch. Don't have the whole diagram
"It's not what happens to you, it's what you do about it"

Offline schleven

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Re: Samsung dryer, frustrating
« Reply #6 on: March 04, 2017, 02:38:30 PM »
I am pretty sure that the heater relay on the board was working on the ones I had to replace the motor on.
"It's not what happens to you, it's what you do about it"

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #7 on: March 04, 2017, 07:58:55 PM »
Thanks for the info guys, I might as well add a motor to my order and have multiple part to try. I'll be shocked  if this somehow controls the relay but I'm at my wits end so it's worth a try.  You don't happen to have a complete wiring diagram do you? It would certainly help clear things up.

Offline schleven

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Re: Samsung dryer, frustrating
« Reply #8 on: March 04, 2017, 08:09:56 PM »

Thanks for the info guys, I might as well add a motor to my order and have multiple part to try. I'll be shocked  if this somehow controls the relay but I'm at my wits end so it's worth a try.  You don't happen to have a complete wiring diagram do you? It would certainly help clear things up.


I am not sure that this is your model, but it was out there on the web..
"It's not what happens to you, it's what you do about it"

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #9 on: March 04, 2017, 08:58:44 PM »
Thanks, looks pretty straight forward, line 2 passes right through the motor switch with 120v. Which I have tested, I'm positive I'm getting power through this switch. Looks like the second switch is the neutral.  Then line one feeds the remaining 120v through the heater relay. If I jump out this relay then power flows and the heater comes on. So I think I'm still coming back to what closes that relay?  Assuming the control boards are not defective, what tells the relay to close is the thermistor, correct? I guess I'll also have another thermistor and control as well along with the ui and motor one way or another this think is getting fixed lol.

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #10 on: March 04, 2017, 09:04:04 PM »
Found the tech manual. What do you think they mean by the membrane switch open? Are the referring to the UI?

Offline schleven

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Re: Samsung dryer, frustrating
« Reply #11 on: March 04, 2017, 09:06:27 PM »
Membrane switch open...
Hmmmm
Never seen that.
Strange one for sure.
"It's not what happens to you, it's what you do about it"

Offline dab147315

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Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #13 on: March 05, 2017, 11:03:07 AM »
Maybe this would help. https://drive.google.com/file/d/0B-i5KqMA2RZwaUtxQ2RtdVF6a0U/view?usp=sharing
https://drive.google.com/file/d/0B-i5KqMA2RZwaGEwX3h6ajZ5aGM/view?usp=sharing

Interesting, so the membrane it's referring to is the centrifugal switch. Well I've got a motor, a main board, thermistor, and a sub Pcb on the way lol. I will certainly update everyone as soon as I'm done.  Gain thanks for all the troubleshooting

Offline dufuss

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Re: Samsung dryer, frustrating
« Reply #14 on: March 09, 2017, 12:03:25 PM »
The  push button panel from my understanding is the membrane switch.  Does the dryer have this?

Offline scrapiron

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Re: Samsung dryer, frustrating
« Reply #15 on: March 09, 2017, 12:57:33 PM »
Since I couldn't find any mention of this in the Samsung service manual, what is the motor sensing function of the board and motor switch? It connects terminal 3 of the AC connecter to neutral. No heat? Anybody know?

I had one of these too. It turned out to be the centrifugal switch in the motor. Attempting to attach a pic. You can bypass the switch by jumping these 2 outer wires on the board. There is a 3 wire molex in the corner of the main PCB, jump the brown and black wire (2 outer wires. If heat works, replace the motor.
That's not a good idea as it would short L2 to neutral through the motor switch and door switch. Perhaps he meant jumper the white to black?
« Last Edit: March 09, 2017, 01:13:50 PM by scrapiron »

Offline dentdaddy

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Re: Samsung dryer, frustrating
« Reply #16 on: March 09, 2017, 02:38:19 PM »
In this photo, jumping brown to black bypasses the motor switch. If heater then works you need to replace the motor. This was done per tech support while I was on the phone with them.
Good work isn't cheap. Cheap work isn't good.
SW Oklahoma

Offline scrapiron

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Re: Samsung dryer, frustrating
« Reply #17 on: March 09, 2017, 04:09:36 PM »
I stand corrected. I misread the wiring diagram. The brown wire DOES connect to neutral. Good info to know. Sounds like you may have solved Joey's problem.

Offline Joeyt56

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Re: Samsung dryer, frustrating
« Reply #18 on: March 09, 2017, 06:50:02 PM »
And the winner is...... Dryer motor!! Thanks everyone for pointing me in the right direction!  :cheers:   That's is why I keep coming back here for advice when needed usually ends well when I do.

Thanks Dentdaddy for clearing the issue up from a technical stand point, I always like to see WHY something is acting the way it is. Basically the board thought the motor Wasn't running so it wouldnt open the relay to allow the heater to turn on. Pretty simply now that i look at the schematic, just needed to know that the board had that motor sensing function and where it was, schematic leaves that part out lol.And thanks for the tip to test it in the future.
« Last Edit: March 09, 2017, 06:53:59 PM by Joeyt56 »

Offline dab147315

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Re: Samsung dryer, frustrating
« Reply #19 on: March 10, 2017, 03:48:49 PM »
So what is happening here, terminals 5 and 6 are not closing and there is no signal back to the board? If so, how are the start windings taken out of the circuit? I am missing something here.