How to Troubleshoot & Replace Lg AP4440232 / 6871ER1003C Main Printed Circuit Board

Watched a video what could be wrong with my lg tromm washer not pumping water out changed the pump didnt work called AppliancePartsPros.com told me i probably need to change Main Circuit Board they sent it in two days along with email vedio step by step how to change not difficult at all and it worked thanks AppliancePartsPros. 

The problem was the main control board. 

Replaced with new power board. 

Replaced part 

I originally heard a loud pop and nothing was lit up on the display screen. No power was coming through and manual said it was either noise filter or control board. Checked to see if power was still coming through filter and it was so, had to be control board. Very simple to replace. 4 or 5 screws and a couple of clips. Happy to have the washer working again. 

I got a circuit board. Easy to install. Project took less than 30min 

Replaced the main circuit board. took 30 minutes this included testing the line filter card. no problems with removal or install part fit well. 

Removed top of washer, tested wires coming into pcb and found it to be faulty so I ordered it from this website and it came in 3 days. Removed the old, don't forget there is 1 screw on the back of the washer holding it in but the rest is just tabs. Installed the new and it works fine again. 

I called a repairman. He said it would be $ 650 to replace the motherboard and a leaky water valve. I decided that amount was ridiculous so I looked up the parts online at AppliancePartsPros.com, watched some YouTube videos on how to the repair and fixed it myself.It took less than 30 mins. Total cost: $182.00 The repairman told me the water valve part alone cost $180 dollars and then $70 to put it in for me. I asked him if I could order the part myself and he said "No, you have to be authorized to order these parts" Anyway, that part actually cost $14.92. I am a 45 year old woman and have never fixed any appliance before in my life, but I replaced the water valve and the motherboard by myself. For someone that always do their own repairs, this might not seem like a big deal, but for me it was a huge accomplishment and I'm feeling proud. 

Stated with the most common problem, the Hall effect sensor. Intermittent LE error continued. Next, replaced the motor wiring harness, same thing. Replacing the main board seems to have done the trick, Over a week with no failure. Most difficult part of the job was getting the 4 mounting feet to properly engage the slots in the sheet metal. After that just a matter of plugging in all the connectors. What with colorcoding, shape of the different harnesses, and different shaped connectors, this was unambiguous. You may need to disconnect the ground wires screwed to the chassis in this area for clearance and cable slack. You did unplug the machine before you started, right ? An intermittent failure like this can be one of the hardest diagnoses you will ever make, just don't give up.