Video of the somewhat common SB-600 blinking display issue. The flash appears to work fine except for the blinking display when powered on, and automatically turning on whenever batteries are inserted. Note: if the flash goes in standby mode, STDBY will be displayed on the LCD, but the screen will not flash. It may be worth noting that the backlight is not active in standby mode.

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For most, this issue appears without any other effects, but in my case bad batteries leaked into the camera and corroded some of the circuit leads, after which the flash no longer turned on. I disassembled the flash and soaked the boards and battery compartment in a baking soda solution, and after drying removed any buildup with rubbing alcohol. After reassembly, the flash turns on, but behaves as above; with a flashing LCD screen, and turning on automatically whenever batteries are inserted.

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I wouldn't recommend disassembling your flash by yourself if you have any other options and/or don't know what you're doing. I was careful but still shocked myself during reassembly (thus the somewhat shaky footage). The capacitor in the SB-600 can stop your heart, and can retain a charge even with the batteries removed. You could also damage your circuit boards and void your warranty by disassembling the flash.

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