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11 replies to this topic

#1 montrue

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Posted 31 August 2013 - 01:37 PM

2yr old lg refrig lfx28978st/01 lights and fans working compressor not working checked power board at #5 and#7 no power to compressor.Could use some help .I think the power board is bad? I have not worked on new lgs.Also power board light is flashing 7x cannot find codes. ty jeff 



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#2 RegUS_PatOff

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Posted 31 August 2013 - 02:12 PM

http://appliantology...service-manual/

MODEL :
LFX28978
LFX25978
 
7 FLASHES
IPM Fault
E-Inv. / A-Inv.  (depending on Compressor part number)
High current detected due to IPM failure.
(Inverter)
 
IPM Voltage Check
To ensure proper diagnosis, make sure that the unit has been plugged in for at least 10 min.
To determine if the compressor is receiving the proper voltage,
check the PCB output voltage during operation.
Normal operating voltage will be between 80V AC and 180V AC.
Note : Higher voltage readings may occur under “heavy” load conditions.
 
IPM fault Trip
Replace sub PCB since there is high chance that it is caused by sub PCB’s part defect.
picUnavailable175.jpg
 
 
 

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#3 john63

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Posted 31 August 2013 - 06:59 PM

<<<checked power board at #5 and#7 no power to compressor.Could use some help>>>

**************

1) Unplug refrigerator for *15 minutes*---to rule out the possibility of MAIN BOARD having enabled "SAFE MODE" (triggered by electrical disturbance---such as static).

2) Plug in refrigerator and wait 5 minutes---verify power to the Compressor.
If none---replace the MAIN BOARD (EBR65002710).
To eliminate:

Musty odor

L-O-N-G cycle times

Dingy/yellowing whites

Suds error message

Slow spin speeds

Intermittent water leaks (from rear of washer)

And other annoying symptoms which vary brand-to brand.

Read below:

The *correct* amount of HE (High Efficiency) detergent that should be used in any front load or agitatorless top load washer with tub sizes 3.0 cu ft and larger is as follows:

HE: (2) Tablespoons Per Wash Load

HE 2X: (1) Tablespoon

HE 3X: (1) Teaspoon

Perform a TUB CLEAN CYCLE every (4) months.

Use: "Tide Washing Machine Cleaner"

#4 montrue

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Posted 01 September 2013 - 01:46 PM

ok guys who is wright or do i change both boards? i know a board is bad but what one?



#5 john63

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Posted 01 September 2013 - 05:14 PM

<<<ok guys who is wright>>>

 

************************

 

More Regus than I :)

 

Both of us had the wrong part numbers (LFX28978ST/   *01*)

 

Regus has you looking in the right direction (Compressor Board rather than Main Board).

 

Try the following:

 

Unplug refrigerator for 15 minutes (To Cancel/Erase SAFE MODE---if enabled).

 

Plug in refrigerator.

 

Wait at least 30 seconds before testing compressor voltage (200 VDC).

 

If voltage is available and compressor is running---unit may have been in Safe Mode. Allow refrigerator to run at least 24 hours.

 

If none...replace the Compressor Board (EBR65640204).


To eliminate:

Musty odor

L-O-N-G cycle times

Dingy/yellowing whites

Suds error message

Slow spin speeds

Intermittent water leaks (from rear of washer)

And other annoying symptoms which vary brand-to brand.

Read below:

The *correct* amount of HE (High Efficiency) detergent that should be used in any front load or agitatorless top load washer with tub sizes 3.0 cu ft and larger is as follows:

HE: (2) Tablespoons Per Wash Load

HE 2X: (1) Tablespoon

HE 3X: (1) Teaspoon

Perform a TUB CLEAN CYCLE every (4) months.

Use: "Tide Washing Machine Cleaner"

#6 john63

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Posted 01 September 2013 - 05:27 PM

Okay...

 

Here's why the confusion...

 

I looked up data on LGs website using the model number---but failed to select "01"

 

Regus actually made no error:)

 

RepairClinic is listing the part number (EBR64173902) for this model---> LFX28978ST/00

 

For your refrigerator---which is LFX28978ST/01---we need this part--->EBR65640204


To eliminate:

Musty odor

L-O-N-G cycle times

Dingy/yellowing whites

Suds error message

Slow spin speeds

Intermittent water leaks (from rear of washer)

And other annoying symptoms which vary brand-to brand.

Read below:

The *correct* amount of HE (High Efficiency) detergent that should be used in any front load or agitatorless top load washer with tub sizes 3.0 cu ft and larger is as follows:

HE: (2) Tablespoons Per Wash Load

HE 2X: (1) Tablespoon

HE 3X: (1) Teaspoon

Perform a TUB CLEAN CYCLE every (4) months.

Use: "Tide Washing Machine Cleaner"

#7 montrue

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Posted 01 September 2013 - 06:45 PM

thank you, confirmed what i thought  i will let you know later this week.



#8 JJ Surfer

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Posted 02 September 2013 - 12:21 AM

On the main board there is a test button, press it once and it should run fans and compressor. When replacing any board check what number is on the board, sometimes lg's website is wrong.

#9 montrue

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Posted 04 September 2013 - 07:19 PM

Thank you to each and everyone of you.  I am a first time member of this forum.  I have been working with appliance's for 38 years.  I guess I need to start taking some IT course's.  (NOT)  I think I will stay with the Samurai Appliance Repair Academy.  You guys are great, and I hope that someday I can return the favor.  The LG refridge replaced the board and all is good.

 

Thank you all again,

 

J.Carter Appliance Service

Philadelphia, Pa.



#10 certified tech group 51

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Posted 04 September 2013 - 11:30 PM

Which board did you replace?????..................



#11 Samurai Appliance Repair Man

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Posted 05 September 2013 - 08:06 AM

Which board did you replace?????..................

 

 

 

 

For your refrigerator---which is LFX28978ST/01---we need this part--->EBR65640204



#12 montrue

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Posted 05 September 2013 - 11:56 AM

Which board did you replace?????..................

The sub PCB board for the compressor


 

The sub PCB board for the compressor






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