LG ThinQ UP MoodUP LED Color Control App Issue:... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) receives commands from the LG ThinQ app via the Wi-Fi module. The MCU then sends signals to the LED driver board, which controls the color and brightness of the LEDs. Voltage paths are critical for proper operation; a break in the path will stop the lighting command.

Symptoms:

The homeowner is unable to change the LED colors on their LG ThinQ UP MoodUP refrigerator using the LG ThinQ app.

Possible Causes:

Faulty Wi-Fi module
Corrupted firmware in the MCU (Main Control Unit)
Defective LED driver board
Wiring harness issue between MCU and LED driver
App incompatibility or software glitch
Power supply issue to the LED assembly

Solution:

1

Verify Wi-Fi connectivity: Ensure the refrigerator is connected to the home Wi-Fi network. Check the Wi-Fi signal strength in the ThinQ app.
2

Power cycle the refrigerator: Unplug the refrigerator from the outlet for 5 minutes, then plug it back in. This can reset the MCU.
3

Check LED driver board voltage: Using a multimeter, verify the voltage to the LED driver board. Consult the service manual for the correct voltage range (typically 12V DC or 24V DC). If no voltage is present, trace the wiring back to the power supply or MCU.
4

Inspect wiring harness: Examine the wiring harness between the MCU and the LED driver board for any loose connections, damaged wires, or corrosion.
5

Update ThinQ app and refrigerator firmware: Ensure the LG ThinQ app is updated to the latest version. Check for refrigerator firmware updates within the app.
6

Reset the MCU: Refer to the service manual for the specific procedure to reset the MCU. This may involve pressing a combination of buttons on the control panel.
7

Replace LED driver board: If the voltage is present but the LEDs are still not responding, the LED driver board may be faulty and need replacement.

Safety Warning:

Disconnect power to the refrigerator at the breaker panel before performing any electrical troubleshooting. Lock Out Tag Out (LOTO) procedures must be followed. High voltage is present in the control panel.

Prevention:

Regularly check for firmware updates in the LG ThinQ app and install them promptly. Ensure a stable Wi-Fi connection.

Expert Tip:

Access the service mode by pressing and holding the 'Door Alarm' and 'Lock' buttons simultaneously for 5 seconds. This may provide error codes or diagnostic information related to the LED control system.

Follow-up Questions:

Frequently Asked Questions

•Where is the LED driver board located?

The LED driver board is typically located behind the control panel or near the LED assembly at the top of the refrigerator. Refer to the service manual for its exact location.

•What voltage should I expect to see at the LED driver board connector?

The voltage will vary depending on the model. Consult the service manual, but typically it will be either 12V DC or 24V DC.

•How do I determine if the MCU is sending the correct signals to the LED driver board?

You will need a multimeter and the service manual. Check the signal pins on the MCU connector going to the LED driver board to see if they are changing state when you try to change the LED colors via the app. This requires understanding the wiring diagram.

LG ThinQ UP MoodUP LED Color Control App Issue: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the LED driver board located?

•What voltage should I expect to see at the LED driver board connector?

•How do I determine if the MCU is sending the correct signals to the LED driver board?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: