Yongnuo YN560 III Speedlight Repair 

Yup, it happened to me too recently something so simple. I still run around with a YN560IV on a belt clip in 2024 for Real Estate photography though I've switched the rest to Godox. Glad it helped 👍

Not likely the issue since you wisely removed batteries before storing it, unless corrosion from past use. Maybe the soldering connecting wires to the battery terminals were fatigued and finally broke? I made DIY dummy batteries and accidently put them in backwards/reversing the polarity which blew the soldering from overload. I switched to Godox TT600 cheap and equally good. Best of luck!

Forgot to mention the obvious problem that's easy to overlook. Check the little metal battery spring contact plates to make sure they are fully extended and aligned. If even one battery is not touching both terminals, nothing will turn on. It happens...

Have a look with the batteries installed and the cover open, usually you will see one or two batteries sitting lower than the others (usually the negative ends of the batteries against the cover). Try using a paper clip bent into a hook at one end and pull up the battery contacts as they bend over with use

Good tip, thx👍 Fortunately no corrosion yet since always remove batteries after every shoot.

Sorry never saw your message. You probably got a new one or fixed it by now. That would have been my guess too though.

This is a guess, so take with a grain of salt :) If the whirring sound is constant it almost sounds like the zoom mechanism which you're hearing (which moves into position on startup) is stuck on something, maybe a wire? If it were stuck running that might prevent the capacitor from fully charging and the flash ready beep from beeping. The test flashes would also be weak as a result. You could attempt to remove the case and see if zoom mechanism is stuck, at the same time check that the flash bulb filament is still good. Don't touch anything though without discharging the capacitor first. It could also be IGBT transistor I saw a post on. That would require soldering. I've only replaced a blown fuse, a flash bulb and broken power connection like in this vid. DISCLAIMER: I don't have any formal electrical training, I'm just a photographer so be careful and attempt at your own risk. Also, be aware the the top circuit board still has electricity even after you discharge the capacitor. I know this because I zapped myself last time I did this thinking everything was fully discharged. Good luck!

Sorry haven't had that problem. You're saying pilot light stays blue and doesn't turn red? Did you try factory reset? press both mode and illuminate/sound buttons to get to advance settings, scroll up or down arrow, until you get to "Cl ea" and then hold down the select button to reset.

I have the same problem.. Not yet repaired.. Blue light stays continuously on.. And won't change to RED.. What should I do?

Anytime this happens to me, I first try new set of batteries (could be dead cell or battery contacts need cleaning as well), second check that the batteries all sit level in the compartment if even one is slightly lower it will stop flash from turning on. This happens because battery contacts are pressed down over time and the springs are no longer fully extended. I sometimes use tweezers or make a tool out of a paper clip to reach in and extend the battery contacts back up. Last, you could have blown a fuse, if so they are cheap $7, BUT if you do not know how to discharge the electricity stored in the speedlights capacitor it can shock bad enough hospitalize you, so I would just buy another speedlight. I now use Godox TT600, cheap $65 on Amazon. Hope this helps.

Hey Alfonso, I did the same. If positve/negative terminals still good like I showed in video, maybe the fuse blew? You can order fuses on Amazon for under $10, but you need to research which they take. I did it once for a YN560 IV and was a pain to install, but it worked. Check if fuse is still good by testing continuity between the terminals with a multimeter if you have one. Other than that maybe the capacitor? I don't know how to test/replace those, just remember to disharge them before trying it. Best of luck man, lmk if you figure it out.

Don't recall, but see if I can find it and let you know.

Fairly certain this is it on Amazon: PoiLee Capacitor 470uf 16V Radial Electrolytic Capacitor 8x11mm 105 C (Pack of 10pcs) a.co/d/6tzJVfY

Sorry Philip wish I could help. Never had that model so haven't had a chance to take it apart. I don't see any other repair videos posted on it either. Best of luck.

@@johnramirez4217 Hi John, I appreciate your reply. My on/off switch is in the same exact spot as your model, it is just a 3-way rotary type. When you had your unit apart, was your on/off switch easily accessible? That would be helpful for me to know that info this way I know that at least I'll have good access to the switch to try and repair/replace it. (Assuming I can find the correct part). Hopefully it's repairable so I don't have to look for the correct part. Thanks again. Your video is very helpful. Philip

@@uptownphotography Looking at the video again, I would say no, it's not easily accessible. It looks like you have to remove the whole motherboard just to access it. If you do decide to go there, just make sure you know how to discharge the capacitor, definitely not worth trip to hospital or worse. I started using Godox TT600, relatively cheap $70 and work well. I prefer the quick on/off switch on these better.

Same mechanism and basically same layout. The motherboards looked only slightly different. In my YN560IV the capacitor was bright blue and easy to identify so that I could stay clear of it when handling and discharge it before doing any further repair. They also use the same type of fuse.

Sorry Aamish, I have no idea, never had that problem. If switch broke, I don't even think you could buy a replacement for it. Would have to find another broken Yongnuo to use it for parts and probably wouldn't be worth all the trouble. I could be wrong, I don't have any background in electronics. Let's us know if you find the solution. Thx.

Hi Aamish, I have exactly the same issue. The flash is fairly new. So no corrosion. Please let us know if you managed to get it working