Speed Queen Dryer Touch Screen Not Responding:... | appliancefaults.com

Technical Background:

The touch screen sends signals to the MCU on the main control board. These signals are interpreted and used to control the dryer's functions (heat, motor, timer). The MCU receives 5V DC logic signals from the touch panel and communicates through a serial data bus. A problem in the power supply, the touch panel itself, the ribbon cable, or the MCU can cause this issue.

Symptoms:

The user reports that the touch screen buttons on their Speed Queen dryer are not responding. The dryer may power on, but no commands can be entered via the touch screen.

Possible Causes:

Power supply issues to the control board.
Faulty touch screen panel.
Loose wiring connections.
Software glitch in the MCU (Microcontroller Unit).
Damaged ribbon cable connecting the touch panel to the control board.

Solution:

1

Disconnect power to the dryer at the breaker panel. Verify power is off using a multimeter.
2

Inspect the wiring harness connecting the touch screen to the main control board. Look for loose connections or damaged wires. Use a 1/4-inch nut driver to tighten any loose connections.
3

Check the ribbon cable that connects the touch screen to the control board. Reseat the ribbon cable at both ends.
4

Visually inspect the control board for any signs of damage, such as burnt components or bulging capacitors.
5

Verify the voltage to the control board. You should see 120V AC at the designated power input terminals on the board.
6

Try a hard reset of the dryer by disconnecting power for 5 minutes, then reconnecting. This can sometimes clear software glitches.
7

If all else fails, replace the touch screen panel or the main control board.

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. The control board operates on 120V AC, which can cause serious injury or death.

Prevention:

Avoid excessive moisture around the dryer's control panel. Regularly clean the touch screen with a soft, dry cloth. Ensure proper ventilation around the dryer to prevent overheating. Perform regular visual checks of wiring connections.

Expert Tip:

Some Speed Queen dryers have a diagnostic mode accessible through a specific button combination. Consult the service manual for your specific model to access the diagnostic mode and check for error codes related to the touch screen.

Frequently Asked Questions

•How do I test the ribbon cable for continuity?

Use a multimeter set to continuity mode. Place one probe on each pin at one end of the cable and check for continuity with the corresponding pin at the other end. A break in continuity indicates a damaged cable.

•Where can I find a service manual for my Speed Queen dryer?

You can often find service manuals online through appliance parts retailers or by contacting Speed Queen directly with your model number.

•How do I identify the correct replacement part number for the touch screen?

Locate the model and serial number of your dryer (usually on a sticker inside the dryer door). Use this information to search for the correct part number on appliance parts websites, or call an appliance parts supplier. They can help identify the correct part.

Speed Queen Dryer Touch Screen Not Responding: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the ribbon cable for continuity?

•Where can I find a service manual for my Speed Queen dryer?

•How do I identify the correct replacement part number for the touch screen?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: