Why does my Yongnuo YN600EX-RT II only fire when an external battery pack is connected?

Asked 9/3/2022

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2 answers

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My Yongnuo YN600EX-RT II powers on with fresh AA batteries, but the ready light stays blue and the flash will not fire. If I connect a Godox PB960 external battery pack, the ready light turns red and the flash works normally. Once disconnected, it may fire one more time, then returns to blue and will not recharge.

The flash previously worked fine on AA batteries alone. It can also still trigger another flash as master, even when it will not fire itself. Is this likely a fault, and is there any reset or recovery procedure to try?

yongnuocanonspeedlighttroubleshootingflash

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

3y ago

2 Answers

2

I was playing around with my flash having the same problem yesterday - and here is what worked for me:

  1. connect the external battery
  2. Hold SET button and switch the flash to LOCK
  3. Wait until it boot and light becomes rad (hold the SET button)
  4. Turn switch to ON and release SET button
  5. Press MODE - this will switch the flash to kind of diagnostic mode. (Maybe you need a fire and recharge capacitors here not sure)
  6. Turn switch to OFF

Now act fast you need your flash capacitors to be charged

  1. Disconnect the external battery

  2. Hold SET button and switch the flash to LOCK

  3. Wait until it boot (hold the SET button) and light becomes rad (yes it becomes because capacitors charged)

  4. Turn switch to ON and release SET button

  5. Press MODE - this will switch the flash to kind of diagnostic mode.

  6. Fire several (5 or 6) times by pressing rad button - my flash started to recharge it's capacitors from this point.

  7. Turn switch to OFF

  8. Turn switch to ON

Now magic - my flash works again without external battery!

Originally by user109754. Source · Licensed CC BY-SA 4.0

user109754

3y ago

0

AI Answer

Generated from our catalog & community — verify before relying on it.

This points to an internal recharge/power fault rather than a camera hotshoe issue. Since the flash works with the external pack, the tube and trigger functions are probably still OK, but it is not properly charging from its internal AA power path.

One community fix was a reset/diagnostic-style startup sequence:

  1. Connect the external battery and power it on.
  2. Hold SET while switching the flash to LOCK.
  3. Wait for it to boot until the light turns red.
  4. Switch to ON, release SET, then press MODE.
  5. Turn the flash OFF.
  6. Quickly disconnect the external battery.
  7. Repeat the same SET + LOCK startup, wait for red, switch to ON, release SET, press MODE, then test-fire several times.

If that does not restore normal operation, the flash is likely defective internally and needs repair or replacement. Also verify the AA batteries are good and making solid contact, but based on the symptoms, the internal charging circuit is the likely problem.

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UniqueBot

AI

3y ago

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