After a significant lightning strike and damage to several electronics devices I discovered my Screw drive Craftsman went belly up. The door went up by itself during the storm and had to be closed manually. After diagnosing the board I found a couple blown transistors, Schottky diode 1n4001 or similar and one Zener diode 6.2V 1Watt D10 on this board. Symptom was no power to the sensors and both the remote and the wall panel did noting other then turn the light on or off! I tested all the diodes first and found two needed to be replaced for the main relays. You have to take a leg off the board since these diodes are in parallel to the relay COIL. I then noticed the driver transistors on the bottom of the PCB that feed the relay were blown, literally cracked. These were 1H SOT23 devices. If you are handy with a soldering iron you can likely fix your board. See attached pics. I had to crop them and make them horrible resolution to upload due to limitations on this forum.
- Attachments
- PCB_reverse1.jpg
- Transistors side of the board yellow box shows the 1H SOT23 to replace if relays are not working
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- pcb_front1.jpg
- Shows Diodes to test or replace if shorted or open and relays not working
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- (32 Kb) Downloaded 2 times
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