Whirlpool TruCool Refrigerator: Display Blank, Lights On... | appliancefaults.com

Technical Background:

The display module receives power and data signals from the main control unit (MCU) via a wiring harness or ribbon cable. The MCU regulates voltage to the display. A failure in the power supply circuit on the MCU or a problem with the data transmission can cause the display to go blank. The MCU gets its main power directly from the 120V AC power line.

Symptoms:

The Whirlpool TruCool refrigerator has a blank display, but the interior lights are working normally. The refrigerator is still cooling.

Possible Causes:

Power supply failure to the display module.
Loose wiring harness connection to the display.
Defective display module.
Faulty main control board (MCU) not sending signals.
Blown fuse on the control board.
Software glitch or corruption.

Solution:

1

Unplug the refrigerator or turn off the breaker in the breaker panel (LOTO - Lock Out, Tag Out).
2

Locate the display module. Usually, it's on the refrigerator door, or behind a trim panel at the top of the refrigerator.
3

Check the wiring harness connected to the display module. Ensure it is securely connected. Use a 1/4-inch nut driver to remove any necessary trim panels.
4

Inspect the main control board located at the rear of the refrigerator, accessible by removing the back panel. Check for any visible damage (burnt components). Use a multimeter to check the 5V DC supply voltage to the display module using the wiring diagram if available. Test points are typically labeled.
5

Verify the continuity of the ribbon cable connecting the display module to the main board with a multimeter on the continuity setting. A break in the cable will require replacement.
6

If the voltage is absent or the ribbon cable is bad, replace the main control board.
7

If the voltage is present and the connections are good, replace the display module.

Safety Warning:

Always disconnect power (unplug the refrigerator or turn off the breaker) before working on any electrical components. The refrigerator operates on 120V AC, which can be lethal. Observe Lock Out, Tag Out (LOTO) procedures.

Prevention:

Regularly clean the refrigerator coils (condenser coils) located at the back or bottom of the unit. This prevents overheating, which can stress the control board components. Check the door seals regularly for proper sealing to reduce the workload on the compressor and control system.

Expert Tip:

Some Whirlpool refrigerators have a service mode. To access the service mode, simultaneously press and hold the “Freezer Temp” and “Refrigerator Temp” buttons for 3 seconds. This may allow you to run a diagnostic test on the display module.

Frequently Asked Questions

•Where is the main control board located?

The main control board is typically located at the rear of the refrigerator, behind a service panel. You may need to remove a cardboard or metal panel to access it.

•How do I know if the display module is bad?

If you have confirmed that the main control board is sending the correct voltage to the display module, and the wiring is good, then the display module is likely faulty.

•What DC voltage should I expect to measure at the display module connector?

Typically you should see a 5V DC or 12V DC at the connector. Refer to the wiring diagram for your specific model for exact voltage specification.

Whirlpool TruCool Refrigerator: Display Blank, Lights On Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the main control board located?

•How do I know if the display module is bad?

•What DC voltage should I expect to measure at the display module connector?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: