Note: The 888LM and 889LM* are not compatible with Commercial door or gate operators. Create a free website or blog at WordPress.com. After a lot of other troubleshooting and a lot of digging online, I discovered that a pair of 1F supercapacitors in the older 888LM units are guaranteed to fail almost 3 years after the control panel is installed. One exception is the ATS model commercial door operator. Documentation of Stupid Electronics Projects. My garage door does not see a lot of use, so I got 4 years before mine started acting wonky. Other than the voltage rating on these new caps being 3V instead of 2.5V on the old caps, I see no immediate difference. I went ahead and fixed my existing 888LM anyways. I went ahead and fixed my existing 888LM anyways. I was also fortunate that the problem issues I was having were not as bad as some others have reported, namely the control panel shorting out and raising the door while no one is at your home or business. Liftmaster is well aware of this problem and are issuing warranty replacements with no questions asked, which is the right thing to do. Unplug the garage door opener and remove the battery if applicable. Disconnect power. ( Log Out /  Discover the 888LM, garage door wall control from LiftMaster. I initially just figured one of the photo eyes for the light beam were out of whack so I readjusted them back to specs with no improvement in my little issue. Here are some pictures of the old and the new. So, recently my control panel for my Liftmaster garage door opener learned a new trick, namely beeping a short pulse immediately followed by a sustained tone, seemingly at random and rendering my opener inoperable during these episodes. ( Log Out /  A picture of the ‘improved’ caps on the replacement board from Liftmaster. Note: The 888LM and 889LM* are not compatible with Commercial door or gate operators. One exception is the ATS model commercial door operator. The 888LM allows you to control all your doors & home lighting systems. Change ). ( Log Out /  ( Log Out /  Disconnect power. Here are some pictures of the old and the new. They may be low-ESR but I don’t care to bust a meter out to find out. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Ruptured and leaking capacitors do not represent an optimal working condition. Some staining to the PCB, but the electrolyte didn’t have a chance to eat any pads or vias, yet….. New ‘no-name’ supercaps that will likely fail in 3 years, so I felt no desire to order top shelf components knowing that it is likely a poorly–engineered circuit design leading to component failure. Liftmaster is well aware of this problem and are issuing warranty replacements with no questions asked, which is the right thing to do. Change ), You are commenting using your Twitter account. ... To resolve issues with the myQ enabled door control panel. 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