Canon 580EX II Not Firing: Mainboard Repair
A Canon Speedlite 580EX II that stops communicating with the camera often has failed components on its mainboard — repairable at board level, at a fixed price.
Symptoms
- Canon 580EX II not firing
- Camera does not detect the flash on the hot shoe
- Flash stopped communicating with the camera mid-shoot
- No response after fresh batteries or a different camera body
A Canon 580EX II not firing repair usually starts the same way: mid-shoot, the flash simply stops responding and the camera no longer sees it on the hot shoe. In most cases the fault is a handful of damaged electrical components on the flash's mainboard — and we repair them at board level for a fixed €80.
The symptoms
- The flash stops firing without warning, often in the middle of a session.
- The camera does not detect the flash at all: no communication through the hot shoe.
- Fresh batteries change nothing.
- The flash shows the same dead behaviour on a second camera body.
Our customer went through exactly these steps. His 580EX II died during a photo shoot; he swapped the batteries and tried it on another camera, but the flash showed no sign of life and the camera couldn't see it. Luckily he had a spare flash and finished the job — then sent us the 580EX II.
What causes it
When a Speedlite stops communicating with the camera, there are two prime suspects. The first is the hot shoe contact — it is the most exposed part of the flash and can suffer knocks or make poor contact. The second is the mainboard itself. On this unit the hot shoe checked out fine, and inspection of the mainboard revealed several damaged electrical components that had cut off communication with the camera.
Can you fix it yourself?
The sensible home checks are the ones our customer already did: fresh batteries, a careful look at the hot shoe contacts, and a test on a different body. If none of that helps, the fault is on the electronics inside. A word of caution beyond the usual: flash units store high voltage in their capacitors even with the batteries out, so opening one is genuinely dangerous without training.
How we repair it
Our approach is to verify every possibility before replacing entire assemblies — where we can, we repair the faulty part rather than simply swap the piece. On this 580EX II the easy road would have been to fit a complete new mainboard, but our technicians identified the individual damaged components and replaced only those, saving the customer a considerable amount. After reassembly the flash was tested end to end as part of our Canon repair service.
The result: the flash works perfectly again, responds to every command, and the camera reads it exactly as before. A general check-up of the whole unit was included before it went back to work.
Price and turnaround
| Service | Price |
|---|---|
| Mainboard component replacement | €80 (fixed) |
| Internal cleaning | Included |
| Final test & full check-up | Included |
Typical turnaround is 10 working days for board-level electronics. Return shipping within the EU is a flat €20.
Ship your flash from anywhere in the EU — diagnosis is free and the repair is covered by a 6-month warranty. See how it works.
Frequently asked questions
Why is my Canon 580EX II not firing?
If fresh batteries and a different camera change nothing, the fault is inside the flash. The first suspect is the hot shoe contact; if that is fine, damaged electrical components on the mainboard are the usual cause.
How much does a canon 580ex ii not firing repair cost?
Our fixed price is €80. Where possible we replace only the damaged components on the board rather than the whole mainboard, which keeps the cost down.
Do you replace the whole mainboard or just the faulty parts?
Whenever possible we repair at component level — replacing only the damaged electrical components instead of the complete board. It is more work, but considerably cheaper for you.
Is a 580EX II worth repairing?
Usually yes. It remains a powerful, well-built flagship Speedlite, and an €80 fixed-price repair is far below the cost of an equivalent replacement.
