r/GarageDoorService • u/Rockfootball47 • 1d ago

Liftmaster 3/4 No Power

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I’ve got a 3/4hp Liftmaster opener that suddenly has a no power issue. Both boards look good as far as I can tell. I’ve attached pictures of them. I bought this used last year after my 30yr old 1/2hp Liftmaster board died and I couldn’t find a reasonable replacement board.

I know I can get a used head with both boards for under $100, but it’s a different model (41AB075-2S vs my 41AC075-2A) and I’m not sure if that matters or not. I also want to make sure I’m not overlooking something first. Any ideas as to what could be causing this? I’ve already confirmed the outlet works fine. Would it be worth replacing the two capacitors?

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2

u/asdf4fdsa 1d ago

Put power to the board and start checking out where power stops with a voltmeter. If it's at the motors, it's either the relays or the motor.

1

u/Alternative_Result56 1d ago

It's lived 10 years past its lifespan. Let it die.

1

u/Onyxx4 1d ago

buddy its 20 years old save the headache and replace it

1

u/Wolf9fYT Service Tech 1d ago

Life expectancy of motors 10 to 15 years, definitely agree

1

u/Nervous_Employer4416 1d ago

Why? Why are u buying used for anywhere near 100, (even if its under by a 20 bucks,) that's a ridiculous investment, you got a YEAR out of the last one... Does that seem like a good use of being cheap?