ApplianceJunk.com

Forum Index => Refrigerator & Freezer Repair => Topic started by: agreif11 on March 01, 2013, 07:43:06 AM

Title: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 01, 2013, 07:43:06 AM
Guys, have the above mentioned model.  With the freezer set to -4F on the control panel and the fridge set to 33F, the Freezer is at -8F and the fridge is 40F.  Anyone have any idea what could be causing this one.  Is the damper adjustable in these models where it could be somehow set too "closed".  Just want to know what my options are to check.  I'm not sure if this fridge has a temperature compensation resistor, but  it would seem the freezer is ok, so I wouldn't immediately think that would be a possible solution.

Thanks in advance for the help,
Andrew
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 01, 2013, 07:51:39 AM
This is a dual evap model. Check resistance temperature detector against its supposed reading while unconnected from main pcb. Per LG they have up to a 7-10 degree temp swing. Either way.  :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 01, 2013, 09:06:18 AM
Is that on the Con5 wiring?  the only schematic I hase is for a LFX25960 Fridge.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 01, 2013, 10:48:30 AM
They will not be the same. The back of unit should hae large decal of diagram. The main pcb will have markings as well. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 01, 2013, 06:19:59 PM
Well, they replaced the board.  We'll see if that does it, but after 3 hours, temp hasn't really gone down.  I'll give it overnight to see if it actually goes down.  Not sure what else it would be.

Andrew
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 01, 2013, 10:19:44 PM
There is an update for the main pcb and freezer grille/fan assembly. Hopefully they installed the updated set of parts.  :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 01:19:20 AM
Well, 8 hours later, and the temp in teh fridge hasn't gone down.  Looks like replacing the fridge board didn't do the trick.  Not sure if it matters at all, but this fridge was manufactured on Sep of 2012.  The tech made it sound like this was all he could do on this one.  He wasn't sure what else could be done.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 07:41:36 AM
I would still ohm out the fridge temp sensor, just in case. Also, make sure your reading product temp and NOT air temp. I know they correspond but a much more accurate way is product temp. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 09:51:14 AM
Yeah, I'm measuring both air and thermometer in a glass of water.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: niobrara on March 02, 2013, 10:57:21 AM
I have replaced a couple of the boards and grills that other techs have ordered. It did not fix the issue. One had a fan error, so I ordered the fan.  It fixed the issue. On the other I have not received  feedback yet. It did not have a fan error on it. Sensor tested ok. If the sensor tests, is the fan running.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 02:24:33 PM
I have replaced a couple of the boards and grills that other techs have ordered. It did not fix the issue. One had a fan error, so I ordered the fan.  It fixed the issue. On the other I have not received  feedback yet. It did not have a fan error on it. Sensor tested ok. If the sensor tests, is the fan running.
The update is specifically for ER IF, Ice fan error. It WILL resolve THAT issue but remember, they JUST updated the part numbers again. IMHO, main pcbs are pretty robust on lg fridges. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 02:29:05 PM
Yeah, I didn't see any "ER"code pop up on the display, so relying on the tech to have checked that out of it could have been an issue.  At this point I think this fridge is going back.  Does anyone have a service manual for this thing?
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 02:31:54 PM
I should have access, anything in particular you are looking for? I will do my best. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 02:56:19 PM
the main service manual would be great.  the electronics along with how to disassemble the water dispenser would be great.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: niobrara on March 02, 2013, 02:56:52 PM
domain what are they changing on the boards and is there any way to tell if the board you get is a updated one ? Thanks
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 03:23:14 PM
YA BUDDY YOU CAN. Look at your new and old PCBs, and on one of the TWO larger BROWN caps for the inverter side, will have a white label with the exact part number located on it. You will also notice the upper 3 connectors will be longer than the original versions. Original version ended in 01, which led to 09 and now is 16. It is a software update to keep the fans off longer after defrost to let the water sheen off and enter the tray in the compressor compartment versus pull the moisture back up into the fan assemblies and or freezer section. The grille assembly will have more exhaust vents and the intake will be partially blocked off causing a higher overall pressure in the freezer. This will help prevent moisture from being sucked in when the freezer compartment is accessed. The fan and or main have also increased the torque to provide better starting and airflow on the newest updated parts. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: niobrara on March 02, 2013, 05:51:36 PM
Cool,Thanks for the information. I hated replacing there boards without knowing if I was getting a updated board. Besides the grills are so easy to replace.Just remove everything in the freezer. Really like to know what I'm replacing will correct the issue. I still remember there first air flow fixes !! They really seem do be moving ahead on there ref designs. I always liked there set up just hated the ice up issues. Really glad to know about the boards.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 05:52:40 PM
OK, if you can point out where in the service manual these parts are called out, that would be perfect so I can check it and know where to check the resistance that you initially talked about.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 09:31:40 PM
So air temp is varying anywhere between 44 and 36/7ish but the glass of water has never dipped below 40F.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 09:46:13 PM
Thats a tough on. Per lg there is a 7 to 10 degree swing on their thermisters. Hmmm.  :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 09:50:49 PM
I should mention that is with the fridge set to 33.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 09:54:14 PM
Technically it can be 43 per lg when set to the lowest setting of 33.  I am not saying I agree but I can not change product design.  :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 09:57:03 PM
dang, would changing that resistor to a lower resistance value help, or does that not help due to this dual evaporator system?
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 10:07:22 PM
In theory, if you used a different thermister it should work. All lg themisters are interchangeable, between their fridges. They are different between fridge and freezer however. I would wanna know the frost pattern in fridge side. Freezer doing ok? :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 10:18:16 PM
Yeah, freezer is great, set at -4 and sets is about -8F air temp.  Is the thermister something easily changed?  ie, if i called the service tech back and repeated what you said, he shoudl know what I am talking about, right?  Is the thermistor in the fridge somewhere or on the PCB in the back of the fridge?
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 10:20:12 PM
In the fridge wired back to the main. Give it a few days and call back and let THEM do their diagnosis. Me on a interwebz machine means nothing to the tech in the home.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 02, 2013, 10:26:33 PM
Well the last time the guy came out he just replaced the main PCB for the fridge and made it sound like there wasn't more he thought he could do if I continued to have the problem....but I'll call em again and see if they can do something on Monday.  Once they change that, shouldn't take very long for the air temp to get down to that temperature setting, right?  Assuming we're not opening the doors frequently.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 02, 2013, 11:36:28 PM
Give it 24 hours for temp change. Thats the standard. The new main pcbs actually adapt to the conditions over a few weeks time. That is what I am told per lg.  :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 03, 2013, 01:42:00 PM
Ok, freezer is rocking out, right at teh -6F setting we've got it at.  So maybe thermistor or fan.  If you have a manual showing where those are and how to check, I'll pull out the multimeter myself and try to troubleshoot.
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: domain on March 03, 2013, 01:44:25 PM
If it is under the manufacture warranty i would stray away from that. Otherwise have at it. Your unit WILL display a error code for the fresh food fan if not spinning. It has a tach wire. :D
Title: Re: LG French Door (LFX31925) Freezer Cold, Fridge not
Post by: agreif11 on March 03, 2013, 01:54:05 PM
OK, it is under warranty, so I'll hold off.  I'm just an impatient engineer to my core.