God cow tt685 second-generation flash auxiliary focusing light is not on.

The bulb of the focusing auxiliary lamp is damaged, so replace the lamp group; Poor contact, cleaning lamp holder, etc.

The focus assist lamp bulb is damaged, so replace the lamp group: When the focus assist lamp of the second generation flash tt685 is off, because the focus assist lamp is lit with a small bulb, if the bulb is damaged or aged, it will not be on. At this time, you can check whether the bulb of the focus assist lamp is damaged or aging. If the bulb is damaged, you need to replace the entire focus assist lamp assembly.

Poor contact, clean the lamp holder: If the bulb is in poor contact with the lamp holder, it will not light up even if it is normal. At this time, you can check whether the contact between the light bulb and the lamp holder is good. If the contact is poor, you can try to clean the lamp holder.