Hi I got this 2014 used LG fridge in excellent condition the woman said it needs a compressor.
Found service valves have been brazed onto compressor suction line and high side on the filter dryer stub.
No pressure was in the system and saw dye had been added.
Used black light and saw dye in the condensate drain pan water.
Checked evaporator in fresh food section and saw dye all over the coils and dripping into drain pan.
Looked like the aluminum to copper transition crimp was the leak.
Checked freezer evaporator looked fine no sign of dye.
Ordered brand new evaporator assembly since it comes with the defrost heater and sensors and wire harness all attached so decided to go ahead and replace freezer evaporator at same time as I read the defrost heaters get weak over time and I had it all apart already.
When i removed the black tape sealant that they wrap around the brazes to cut the tubing i noticed what looked like damage to the capillary tube just above the braze it felt like someone pinched it with side cutters but looking closer it looks like a factory made pinch off crimped on the capillary tube so its like a tiny orifice made with some type of tool.
Looked at the freezer capillary tube and has the same tiny crimp mark you can feel it with your fingernail.
I wasn't sure if last person working on this did that or if it was factory made crimp.
I cut and filed and used tiny pick tool made sure cap tube was open (below these tiny crimps).
I used Stay Brite 8 to silver solder in the two new evaporators, pulled vacuum for 1 hr and charged with 134a 5 oz.
System is running low side in 20 in hg vacuum and High side 110 psi left it overnight running and fridge is hot inside.
Pulled power cord pressures do not equalize at all low side stays in vacuum with power off.
Obviously a restriction but does anyone know about these tiny crimps are they supposed to be there in the cap tubes?
Or possibly the drier is clogged maybe the last guy used sealer dye to stop the leak and clogged either the cap tubes or drier with it.
PS this is the LG that uses a reversing valve by the linear compressor to direct the flow to each evaporator.
Compressor sounds good and no flashing error led on main board and no errors on front panel.