LG LMXC23746S Fridge not cooling


LG LMXC23746S Fridge not cooling

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6010fd12
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Long story short. Bought this fridge as not working from someone for $100 in hopes that I could learn how to repair a fridge and if successful I could use it. I have very basic HVAC knowledge and experience from replacing car compressors and refilling refrigerant. The story from the owner was that the compressor was replaced 2 or 3 times with the final time the compressor only lasting overnight? before lg finally gave up and gave him a partial refund.

What I noticed after taking home the unit and waiting a day before turning it on was that the compressor and condenser fan were running but the fan inside the fridge was not. Even with the compressor running the liquid line was not getting warm. I understand that there have been problems with the old compressors on these models but this one was replaced with the newer model and the pcb has been updated with the newer firmware (as noted on the sticker).

I am trying to figure out what's wrong here. If the compressor really did fail again or if there is maybe a leak in the system. But if all the refrigerant did leak out then wouldn't the compressor not kick on? (This is the part where I have no clue what I'm doing) I have hooked a low side guage up to the service port that luckily was left my the technician to try and see if there was maybe suction on the low side but the needle stayed just above half a psi and went down to 0 when the compressor kicked on. Any ideas?
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The gauge reading should be between 2psi-6psi assuming its on the low side port which it likely is.. if the line is not getting warm then it is likely not compressing, could be a bad valve within the compressor.. it will  run without freon .. 
I am not familiar with this particular model but did a quick check and see there are several reported issues with the compressor and model design.
You can shut off the refrigerator and with the gauge hooked up the reading should climb to somewhere over 30psi .. if not then it sounds as though it has lost freon as well.. could be a small leak from when the compressor was last replaced.
A more seasoned tech should be able to replace the compressor with an alternate universal compressor, however I am not sure how that works with the newer PC boards.. I retired 15 yrs ago about then time appliances started being controlled more by software than actual components so this may not work on some newer appliances, foreign or domestic.





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I have taken a video on the compressor with gauges hooked up. This is LG's newest universal compressor that they install after the first linear compressor had such a high fail rate. The PCB has also been updated as well for the new compressor. 

https://www.youtube.com/watch?v=UIOXDq5efWw

Please let me know your thoughts on this.
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The high side should be running around 100 psi (the red hose) so I am not sure why that would be near 0 psi.. you can access techs that are more up to date on the newer items through  www.JustAnswer.com  
there is a small fee but they can give you more accurate info as I have been out of the field for quite some time and newer compressors may operate differently than the ones I use to service in the field.







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