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LSB5682SS LG Range Hot Electric Smell

Skthouse

Premium Member
Joined
May 10, 2022
Messages
3
Location
Canada
Model Number
LSB5682SS
Brand
LG
Age
More than 10 years
Hello!

While using the oven Sunday, I noticed a definite hot plastic/electronic smell. It was still able to get up to temperature. No plastic items were near the oven so I suspect it’s coming from the oven itself.

I took a look at the relay board and noticed discolouration around the bake terminal. (See attached) Would this point to the relay board being the culprit and thus needing replacement or should I look for other issues?

Oven is/was otherwise functional.
 

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Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
5,453
Location
Ontario, Canada
Would this point to the relay board being the culprit and thus needing replacement or should I look for other issues?

It definitely looks like a problem. I doubt there are any external problems that would cause such damage to that particular part.

LG LSB5682SS/00 Relay Board

Whether that is the cause of the odor I couldn't say.

Dan O.
 

Skthouse

Premium Member
Joined
May 10, 2022
Messages
3
Location
Canada
Thanks Dan…I replaced that board. Still get a smell when using bake. Definitely that hot electric smell. Still seems to function ok.

I think the smell is coming from the PCB behind the control panel. So the question is it hot because of a fault or is it getting hot from something else? Without maybe a FLIR to pinpoint its hard to tell. I’m wondering if others have seen this before?
 

Dan O.

Appliance Tech
Staff member
Joined
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Messages
5,453
Location
Ontario, Canada
So the question is it hot because of a fault or is it getting hot from something else?

There should be nothing in the range that would cause an electronic control to heat up. A short elsewhere might blow components of it but not usually affect it slowly. If a PCB is overheating, there is usually either a problem in the board itself (ie. bad solder joint, a board component like a relay, etc.) or a problem in the wiring connectors connected to it. A loose or poor connections generate heat which will damage anything in contact with it.

Without maybe a FLIR to pinpoint its hard to tell

Follow your nose? Inspect suspect components for signs of discoloration.

Dan O.
 

Skthouse

Premium Member
Joined
May 10, 2022
Messages
3
Location
Canada
There should be nothing in the range that would cause an electronic control to heat up. A short elsewhere might blow components of it but not usually affect it slowly. If a PCB is overheating, there is usually either a problem in the board itself (ie. bad solder joint, a board component like a relay, etc.) or a problem in the wiring connectors connected to it. A loose or poor connections generate heat which will damage anything in contact with it.



Follow your nose? Inspect suspect components for signs of discoloration.

Dan O.
So I got an appliance repair tech to come and check it out back in may- they did some diagnostics and said it all checked out but to clean the oven to remove the smell.
Recently got a worse burning plastic smell so I took off the back panel and turned on the oven. I did have a FLIR which showed the Relay on the right of the board getting hot fast, then it started smoking at the black terminal(that is connected to the feed coming in from the plug). Is this a bad relay board? Loose connection? It seemed quite tight coming off. Bake element reads 15.7 ohms. Broil element was 14.7 ohms too.

I’m hesitant to put another board in until I find root cause…
 

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Dan O.

Appliance Tech
Staff member
Joined
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Messages
5,453
Location
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did have a FLIR which showed the Relay on the right of the board getting hot fast,

That's a good idea.

Is this a bad relay board?

Yes. Either a poor contact inside the relay or maybe a bad solder joint on the board. There are no external causes that should cause such overheating besides a bad connector (see below).

Loose connection?

It may not have been. If the terminal or its connection caused the problem with the relay, the terminal would usually be charred pretty good.

The terminal could however have gotten overheated by contact with the relay. If there is any discoloration on the terminal or the wiring though, I'd suggest cutting back the wire to an unaffected portion and installing a new terminal before replacing the board just in case.

JMO

Dan O.
 
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