Rep: 85
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Hi,
Our Canon EOS 7D is about 6 months old. Can't get it to switch on - have fully charged the battery but it just flashes empty. Bought a second battery a couple of days ago and same thing. The CF door closed and the battery door closed, tried taking out the clock battery and resting for a few minutes, still nothing. tried with lens on and off, still nothing.
Any ideas?
Thanks!
Ist dies eine gute Frage?
Rep: 104
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6 months old..? Claim your warranty then...
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my canon is a older one just gave to me from friend wont turn ona2300 hd powershot
Not working for me, My warranty already expired !
Rep: 145
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Check the CF door micro-switch. That was the problem on my 7D when it refused to power up all of a sudden after 3 years of faithful services. Applying some pressure on the door from right to left on the upper part of the CF door might fix it.
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Thanks, this fix the problem for me.
Thanks for the tip! To my amazement, I tried this technique (picture was very helpful) and my camera came back to life. It worked for awhile and then went down again. I tried this trick again and the small little tab broke off and the camera is still dead....any suggestions?
Thks... It worked for me.
Hello Jean Lucas, I can't thank you enough!
I had the same problem. 7D dropped dead suddenly, after 3-4 months of no use.
Thought the battery died so tried with another battery. Nothing.
Then saw your comment about removing the memory card, and that did the trick instantly!
Oh man people like you are why i frikking love the internet!
@desiboho (twitter)
What did you do exactly with this micro switch? I try to press on it but I don't know how it was supposed to be and how it is supposed to be to work :(
Rep: 37
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How about acquiring the AC unit? Be sure you can get a refund if that doesn't do the trick. Perhaps the contacts are dirty. You can try a pencil eraser. This works well with Ram cards so it may solve your issue. Be sure to have an air compressor can to blow out any excess. There are also contact cleaners that quickly dry and clean contacts that may help. if you bought your camera on a credit card your warranty should be doubled as with most credit cards. As far as I know (i've done 3 already) camera needs to be "on" to do the firmware update. Try pulling out the CF card see if the camera turns on.
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Wow – pulling out the CF card fixed it. I had not used my camera in a few months. When I went to turn it on it was dead. Of course, figured it was the battery. Charged both batteries fully and the camera wouldn't turn on. Bought a new battery, still didn't work. Found your comment, took up the CF card, and it is back up and running. Turns out the original batteries were fine. Thanks!
This also worked when I pulled out the SD card on my EOS600D. Sprang back to life. Thank you!
i just followed a string of troubleshooting instructions with no effect. Last one was to reinsert the sd card and put a bit of pressure on the cover..voila! it works. i thought it was the least likely but it worked. my son (whose camera it is) now thinks I'm a genius. thanks
Thanks for the great info. During a battery change, my 7D would only say sensor cleaning when turning it back on even with fully charged batteries. I removed the CF card and it started working!! Sadly I missed out on some great pics due to this but at least it's fixed now.
Rep: 37
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I had the exact same problem, and the fix was easy. Try replacing the Date/Time Battery (it's a CR1616 lithium battery); it did the trick for me, everything got back to normal. See page 235 of your owner's manual for its location. Good luck!
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Thanks, this worked!
Few seem to know and mention this small battery. I've had two EOS cams go dead and come back to life with a fresh CR1616. Check this battery early on before tearing into the camera body. It will shut cameras down when it goes dead. The battery is located in the battery compartment in a tiny slide drawer.
Thanks for the lithium battery tip, replacing it did the trick!
"Cheers to good health, glorious food and a return ticket (photograph) to a moment otherwise gone."
Bam Bridges "World Beaty and Fitness Pro"
Rep: 25
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You may want to update your firmware. I had an issue much like this and they said that they had an update come out to fix this issue soon after the camera was released. You can find firmware updates on canons website.
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I updated the firmware and still having the same problem
https://www.youtube.com/watch?v=DQaejgJM... TRY THIS METHOD ITS WORKS FOR ME
Rep: 139
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This is usually caused by a loose screw (one or more of the screws holding the DC to DC board on the bottom). They can end up anywhere and usually cause extensive circuit damage by shorting different parts of the camera. This is a Canon repair
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As I said befoe, the flashing empty battery symbol and the ERR 40 on a 7D are usually caused by a screw that comes loose on the bottom board. As this board has the flash capacitor and its support circuitry you have over 300 volts available to be shorted into a six volt circuit which then fries.
I have a 7D that shorts when I trigger the flash to open (and shuts off the camera and drains about 80% of the battery all at once). I am guessing that it is your screw issue. Would the short be limited to just the flash PCB on the bottom, so that replacing the board will cure it?
Rep: 13
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Follow these steps to fix the problem:
Symptom: EOS 7D won't turn on. Battery is charged. Tried several batteries. Battery door closed. CF card compartment door closed. Lithium battery fresh.
Diagnosis step one: Look at the top LCD. Is the battery symbol flashing? If yes, make sure your battery (including the Lithium battery) is charged, original, and new. If not (nothing at all showing on top LCD) proceed to step two.
Step two: Is the viewfinder unusually dark? Manual focussing seems off? If yes proceed to step three. If no: The camera receives power but will not turn on because either the main switch, the microswitch of the battery door, the microswitch of the CF card compartment, or several switches are not working. Check those switches. Use screwdrivers to check the operation of the microswitches. Clean the main switch with a strong air blower while switching back and forth (sand!).
Step three: If the viewfinder is unusually dark, the camera gets no power whatsoever (the 7D uses polarizers for the viewfinder displays, such as the focus points to show up - these require a tiny amount of energy and if the power is gone for more than 4 seconds, the viewfinder will go dark - to test what I mean, remove battery, wait 4 seconds and look for yourself). Clean the battery contacts in the battery compartment. In particular the silver one that is closer to the back of the camera. Use a screwdriver and slightly scratch any oxidations off the surface of the lowest, protruding part of the silver contact. After that clean with cotton swab and alcohol. Carefully clean the two copper contacts with cotton swabs and alcohol.
Step four: If it still won't work or fails again shortly afterwards, remove bottom plate and see if one or several screws of the bottom circuit board (towards the handgrip or towards the CF card door) fell out. Happened to me, too. Shaking the camera and tapping with a screwdriver can remove the screw from the innards... Mind the flash capacitor! If none of this helps, it might be the circuit board. Good luck!
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Rep: 13
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GOT THE FIX
*reinsert the card and the battery camera should boot
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Thank you! This is exactly what was happening. I formatted the SD card, reinserted it, and the camera (EOS T-7) booted up correctly.
It's probably the DC/DC board. The DC DC board is not at the bottom, it's at the top under the power button. Contrary to popular belief, the 7d is not weatherproofed AT ALL and moisture is able to squeak through the cracks in several places. I've replaced this board twice. If you decide to do it, it is not that hard but make sure you discharge the flash capacitor first (use a heavy duty resister NOT A SCREWDRIVER). Take a lot of pictures and use a cupcake pan to put the parts and screws. Sometimes when one of the other boards is bad, the DC board will go out again (it has fuses on it). The next logical one to replace is the flash capacitor board. Both are available cheaply.
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Where is the fuse situated on DC-DC Board
I have a Canon 7 D that did error 40 i toked it apart and found that the flatcable going from Bottom PCB to mainboard was punched by the center screw. Got a new cable on ebay and now the camera works again but not the internal flash it gives error 50 . I thought that flash capacitor board was dead bought a new one but no difference.
Any ideas for the Error 50 .
Hi there! I'm having a kind of same behaviour! In my case it seems to be just when I insert the CF card. The camera turns on without the card but once I insert it, it won't turn on again. To power it up I need to remove the card, remove the battery, insert the battery and turn the camera on.
I already switched the time/date battery…
Any help please?
TIA
Emanuel Batalha
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I have the same exact problem... could you fix it? can you tell me how? thank
i to the same problem
I tried everything I could to fix my canon 60d that just would not turn on. (I think it got wet or something) anyway the way I fixed it was that i read on a forum somewhere that you should toggle the ON and OFF switch like 100 times when the battery was out then when you put everything back in SLOWLY move it from OFF and ON until you see a sign of life. For me my camera turned on after many months of not working in between the OFF and ON button for a split second.. in that moment i knew i was gonna fix it! I turned the camera off again and keep toggling the ON and OFF button as fast as I could and every time I turned the camera on it was turning on closer to the actual on button. Eventually I had to secure that the ON button was being pushed to the side so the camera would remain on and after leaving it ON for a while it didnt need to be secured anymore and my camera was working! == Turn off camera, removed everything, toggle the ON and OFF button like crazy, put everything back in, slowly move the OFF button to ON and watch for signs of light, repeat several times until you do(for my it was the light from card holding that flashed orange once, nothing else was working) ==
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Hi, the same problem, my 7D, fell down and does not turn on, the battery indicator flashes as if battery was empty. Removing the CF card or Lithium battery did not help.
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Its the DC DC card inside that has losen from the contact.
The camera has to be taken apart and fit the card agan , and tihgten the 2 screws that holds the card. Its possible by your self f you are handy.
More info on how to do it, where is the board situated, pics would be very welcome
sorry i dont have any pic s left but the DC DC are located under the top.
looking from back side its located to the right.
you have to remove front and back of camera and then remove the top.
there are some cables, take picures on evey thing,
I cant garanti that its that problem but if you drop the camera its very certain that the pcb has gone of the contact.
Here is a link to partslist.
http://www.filefactory.com/file/16hiopjn...
i Have a brandnew DC DC board if yours are deffect.
Regards
Lars
ps i am i Sweden
Hi,
after fall my camera stoped working. The camera fall only from 40cm down to branches of tree. The camera was totaly out of energy. The viewfinder was totaly black, no LCD and no control LED was flashing.
So, I very carefully disassembly the back part of camera (with LCD screen) and look inside (one screw was invisible under rubber at the corner). No connector was fallen, bud when i push down to power board (is situated under little LCD screen with metal boxes), the board clicked back in original position. When I try to put the battery back, the camera was working.
I hope, it can help you.
With regards,
Martin
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I also have same problem my Eos 550D can't power on..then when I go to shop to fix it..the technician said it is a main board problem..
Then I curious about it..
I hope someone can explain about main board problem..and also it cause by what??
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36 Kommentare
WOw.. have the exact same problem.. also as If i should have posted this..
Trying to get copy of my receipt... will see firmware idea.. but if camera doesn't turn on can firmware still be updated?
von Luis
I have the same problem, though I dropped my 7D in a washing machine scene. Soaked for only 2 seconds. I immediately removed card and battery. Dried for 1 week in a tupperware of rice and silica gel. Chucked the battery in and i get a flashing empty battery sign. Tried 3 new batteries and 2 CF cards.. Oh well. Time to buy an A7sii
von Darwin
@darwinzialcita Don't give up on it yet! What is the exact behaviour? Doesn't turn on? Battery symbol flashes or not?
von Paragon
@paragon camera would not turn on. Empty battery symbol flashes in either ON or OFF position. I am sure it is shorted because I soaked it on water. No longer optimistic about it. Can't find a proper guide here on iFixit to on how to open this little baby as well.
von Darwin
If it shows no sign of life at all, after you have put a new battery in, ie nothing on the top lcd display, it is usually a tiny fuse on that pcb which is just below that top lcd display. It is a component which is soldered onto the pcb and is usually white, approximately 2mm x 1mm and designated by a small F or a number on it. Not really a job for a novice diy'er to repair as you have to dismantle a lot of the camera to acces it. But certainly repairable. I have repaired many which show no signs of life at all caused by this very reason.
von Dennis McLellan
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