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#1 |
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![]() Hello. I repaired a canon sl2 for personal use, it had a bad sd card slot, bad battery connector, plus a little bit of water residue on the motherboard. The water damage seems to not have caused any damage, just salt deposits that have been cleaned. After repairing everything works except for the flash.
When shooting with the flash turned on, i get a "wait" message once, then on the second try I get an error: e50. I have disassembled the front to get a look at the flash board, and everything seems good, the flash board also controls the shutter, which works, so it does have communication with the motherboard. I have probed the transistor that switches the transformer (that goes to the flash capacitor), it has battery voltage, but never gets switched. No voltage change was detected on the gate pin with an oscilloscope. It seems this gate pin is connected directly to the motherboard via a flex, I can trace it al the way to the motherboard connector, then I cant seem to find where it goes. Does anyone know what I should check? I don't have pictures, I have closed the camera and I am using it daily, so I don't want to open it again until I have some new ideas. But I canīt find schematics. What has to be working for the flash capacitor to charge up? Does it do any check before so? Maybe check the flash bulb somehow. Sorry, I have absolutely no experience with flashes. |
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#2 |
Leaking Member
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![]() error 50 = An electric control malfunction has been detected. maybe a corroded trace?
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#3 |
Badcaps Veteran
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![]() There are new flash charge boards available, did it look like this?
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#4 |
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![]() I would think that is the issue, since it had white spot from the water, but it was very little localized spotting. I cleaned it up and there seems to be no damage to any traces or components, but the key word is "seems". I wish I knew where to be looking.
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#5 |
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#6 |
Great Sage 齊天大聖
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![]() flash capacitors have limited life.
but even if it's bad you should hear the invertor trying to charge it with a few hundred volts. be very carefull around those caps/boards - they hold a lot of energy for a long time!! |
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#7 |
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![]() Yeah, it's not even trying to charge it. Thanks for the warning, I work on switching power supplies so I take my precautions. The camera also does not want to focus using the autofocus points (not live), I didn't notice this until now since I use it for videos, video uses live autofocus, a different system. I can still focus for photos with live view, just not normal shooting point mode (dont know the name). This could be something I connected wrong, but I'll check it next time I get a chance to open it up. For now it's working for what I need, videos.
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#8 |
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![]() I have opened it and made sure all connections are okay. I definitely has lost it's autofocus capability. I can still autofocus and take pictures in live view mode. But while using it's mirror, the autofocus just drives the lens in then out, then it won't take the picture.
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#9 |
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![]() maybe there is something wrong with the af/mf switch? or something is off with the af sensor.
Last edited by CapLeaker; 02-25-2021 at 12:48 PM.. |
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#10 |
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![]() There seems to be no damage to the phase detection auto focus flex cable. It is just the phase detection system. If I disconnect the phase detector flex, the lens will focus in our out but not both. If I connect it, it will focus in then out with one pulse of the button, but never actually focus.
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#11 |
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![]() Check the second mirror that reflects to (and) the AF senor. Maybe their position changed?
watch this: https://www.youtube.com/watch?v=Tk-Y34nMkeY&t=174s https://www.youtube.com/watch?v=MV7DizzkiiE&t=83s |
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#12 | |
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![]() Quote:
If there is a way to confirm that this processor is to blame (since I have both a missing flash signal and missing phase detect focus) I seem to be able to order from aliexpress. It is the F74966A, located underneath the SD slot, where someone seemed to have forced something in it since the slot was completely destroyed. I just don't know if this processor controls both things. Last edited by liquidzorch; 02-26-2021 at 08:23 PM.. |
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#13 |
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![]() I did check the error 50 thing and and everything I came across, they were changing a capacitor. Just Youtube "canon error 50". However that doesn't help your focus issue. Did you try a known good lens?
The F74966A is a system control processor (MCU). I would guess there should be another IC between it, the flash and AF... besides the MCU needs programming? https://www.magiclantern.fm/forum/in...?topic=17596.0 Last edited by CapLeaker; 02-27-2021 at 11:56 AM.. |
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#14 | |
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![]() Quote:
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#15 |
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![]() If the base trace is disconnected, you won't go anywhere with continuity. Try to follow the trace visually.
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#16 |
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![]() I can't. The trace goes from the flash board to the flex connector on the motherboard, then the trace from the motherboard goes into the second layer of the board. I does not come out the other side. I have continuity up until it goes unto the mid layer. Then no other component has continuity. It must go to a bga (guessing).
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