DEFINITELY A FIX!!! PLEASE READ.
So I was having this same issue as well. I had an LG system for about a year and the rears went out. I honestly didn't even start looking for a solution for about a year later. Found this thread and it was a life-saver! I successfully solved my issue with a combination of suggestions from users posting here.
Thanks to JerseyFind
, here was my process:
I ordered the card and swapped it with the rear receiver card. Here's the card that I ordered:
Appliance Parts Pros (.com) part number: AP5604546
MFG Part Number: EBR65859702
At first, I couldn't get them to sync. The rear receiver simply flashed red to blue and continued to repeat this. No matter what kind of plugging/unplugging I did to BOTH units, I had no luck. THEN....I read BeachCowboy's thread about "remating" the speakers to the main unit. After doing this, IT WORKED FLAWLESSLY. Please note -- I DID NOT buy two new cards -- I simply replaced one of them that went bad. One card's firmware is v18.104.22.168 and one firmware is v.22.214.171.124.
The "remating" is the trick here.
Here's how to "remate" your system:
1. Disconnect the power cords of the wireless speakers.
the [STOP] button on the front of the main unit/receiver and [MUTE] button on the remote control. (on mine, I only had to press them simultaneously instead of pressing and holding). After doing so, "REMATE" should appear in the main unit display window.
3. Re-connect the power supply to your speakers.
HUGE thanks to everyone that helped gather all of this information! I know this is all information that was already on this thread, but its a bit spread out. I wanted to tie it all together as a full solution for everyone.