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Old 12-02-2017, 02:57 PM   #1
junktv
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Default Oven broiler stuck on!!!!

Was getting ready to cook dinner and turned the oven on and the display said clean except the door didn't lock and only the broiler element came on. Nothing would turn it off so I hit the breaker. After a few minutes turned it back on and the same so I waited a few hours to try again. This time all looked normal so I hit the bake button and looked normal so shut it off. Well again the broiler came on but the display showed the oven was turned off.

Oven is a 2000ish whirlpool super capacity 465 mod: GR399LXGQ2

Tested temp sensor and it was 1100 so should be good.
Tested for a short in the broiler element and it was good.

I do see some dry joints on the control board which I assume is why the lock didn't work. They are on wires that do all run over to the limit switch and drive deal for the door lock.

The broil contact looks rough but was open.

I'm not sure how any of this would kick the broiler on element on. Any tips?

Caps are
Nichicon PR(M) 1000uf 50v brown
Nichicon KL(k) 10uf 16v orange
Surge ??? 4.7uf 50v blue
Surge ??? 33uf 16v blue

Has schematics on the back.
Attached Images
File Type: jpg back.jpg (706.3 KB, 30 views)
File Type: jpg lcd side.jpg (672.9 KB, 23 views)
File Type: jpg door lock -switch.jpg (892.6 KB, 18 views)
File Type: jpg broil top contact.jpg (557.3 KB, 21 views)
File Type: jpg left lcd s.jpg (872.9 KB, 21 views)
File Type: jpg right lcd s.jpg (876.8 KB, 19 views)
File Type: jpg oven doc pg1.jpg (366.5 KB, 20 views)
File Type: jpg oven doc pg3.jpg (331.9 KB, 11 views)
File Type: jpg oven doc pg4.jpg (335.5 KB, 12 views)
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Old 12-02-2017, 05:28 PM   #2
R_J
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Default Re: Oven broiler stuck on!!!!

I would start by resoldering those bad solder connections, was the broiler element actually on or was it just the display saying that?
That P3 plug does connect to the oven temp sensor

Last edited by R_J; 12-02-2017 at 05:33 PM..
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Old 12-02-2017, 07:11 PM   #3
junktv
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Default Re: Oven broiler stuck on!!!!

Display showed it was off the second time and first time said clean. It was definitely on both times.

Resoldered and found another dry joint but washed the board so waiting on it to dry to test.
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Old 12-04-2017, 05:42 PM   #4
junktv
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Default Re: Oven broiler stuck on!!!!

After soldering it came on and said cln again. Then gave a EO F2 which should mean shorted key or key tail unplugged.

I did wash it but let it dry a couple days by the heater vent. Also reseated the ribbon.

On the plus side the broiler didn't come on.
Attached Images
File Type: jpg oven doc pg2.jpg (662.9 KB, 9 views)

Last edited by junktv; 12-04-2017 at 06:24 PM..
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Old 12-04-2017, 06:41 PM   #5
petehall347
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Default Re: Oven broiler stuck on!!!!

what is a broiler ? couldn't see it in manual .
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Old 12-04-2017, 06:55 PM   #6
dmill89
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Default Re: Oven broiler stuck on!!!!

Quote:
Originally Posted by petehall347 View Post
what is a broiler ?
A setting on an over that turns on the top element/burner (only) at a very high temperature (usually 500F/260C+).
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Old 12-04-2017, 11:38 PM   #7
junktv
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Default Re: Oven broiler stuck on!!!!

Well I may be back in business. Reseated the ribbon but instead of pushing it all the way in I pulled it back a smidgen and all looks good although I still get a EO F2 if I hold the off/cancel button.

I also notice a tick and a constant buzz when I open the door now. No power should be being used since the bulb is burnt. On the plus side the broiler isn't on.
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Old Yesterday, 09:15 AM   #8
momaka
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Default Re: Oven broiler stuck on!!!!

Quote:
Originally Posted by junktv View Post
Caps are
Nichicon PR(M) 1000uf 50v brown
While this may not be your problem, I suggest you replace all Nichicon PR caps, as they are known to leak electrolyte from the bottom of their bungs without bulging at all. Once the leakage gets bad enough, it will corrode and/or even destroy traces on the board. So definitely get all Nichicon PR caps replaced.

As for Nichicon KL, I don't know if those have any known problems or not, but you might replace them as well if you do replace the Nichicon PR.
My personal recommendation would be to go with Panasonic FC. I think those recently got certified for automotive use, so probably your best bet for a hot oven/stove controller board.
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Old Yesterday, 11:33 AM   #9
junktv
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Default Re: Oven broiler stuck on!!!!

Dry joints were the issue I guess. It's working fine now.

Good to know though I'll add them to the list for next digikey order.
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Old Yesterday, 11:48 AM   #10
stj
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Default Re: Oven broiler stuck on!!!!

white connector P3 looks like the soldering may be cracking
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