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Customer Questions and Answers for Main Control Board (Pcb Assembly) by Lg

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Manufacturer Part
4.89 (64)
By: Lg
Part Number: OEM17905290
Manufacturer Part Number: EBR76210903

This main control board is the appliance's central electronics module, also called the main PCB assembly. It manages power and coordinates sensors and user commands so the unit runs correctly, restoring normal operation when the original board fails. What it does

  • Controls and coordinates motors, fans, valves, and other components based on inputs
  • Processes signals from sensors and the user interface to execute functions
  • Manages timing and safety interlocks for reliable operation
  • Common symptoms of a failed board: unit won't power on/start, unresponsive or erratic controls/display, intermittent shutdowns, or error codes
What's included
  • One main PCB assembly
Install notes
  • Disconnect power to the appliance before servicing; avoid ESD by handling the board by the edges and using grounding protection
  • Move connectors one at a time to matching positions; transfer any brackets, covers, or jumpers from the original board
  • Ensure all plugs are fully seated and the board is mounted securely
  • Some models require a control reset or service test after installation—follow the service manual for your model

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Questions & Answers

For Lg Main Control Board (Pcb Assembly) (Part Number: OEM17905290)

1 Answer

Steve, if the blower thermistor 6323EL2001B measures 10O of resistance, the heater relays would be tested. If the top panel of the dryer is removed, the main control EBR76210903 relays can be accessed for testing. One of the heater relays will have a black wire and a yellow wire which will be used for testing. With a meter probe at each wire as they are installed on the relay, the dryer would need to be started while set to high heat. If the voltage reads 0VAC, this would indicate a failure in the motor 4681EL1008A. If the voltage reads 240VAC, this would indicate a failure in the main control.

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Joe F for Model Number DLEY1201W

My dryer will not tumble. It heats and works normally otherwise. I’ve watched many of your videos (very helpful!). It have the unit disassembled. The belt is connected, taut and fine. The rollers freely move with no noises. I don’t hear any humming or noise at all from drive motor. Even if I let the unit sit for a long time, the drum will not move but freely moves by hand. When I hit run, I do hear clicking initially from PCB board. The cycle counts down but no drum movement. Do I need a new drive motor or PCB board?

1 Answer

Joe, It is very possible the door switch is faulty and acting as if the door was open. 6601EL3001A This part can be tested for continuity when depressed.

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1 Answer

Brian, the most likely issue is that the motor relay on the main control EBR76210903 is stuck in the closed position. This can be tested by testing for 120VAC at connection WH4 pin 3 (brown wire). If there is 120VAC showing at this wire, then the relay is stuck and the main control would need to be replaced. Another test that can be done instead of a voltage test would be to unplug the unit and test from the incoming L1 black wire to the brown wire at connection WH4 for continuity. If there is continuity the relay has failed.

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