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On page 190 of the manual (English) are 5 causes why the flash does not fire, and still the camera is ok. there are even some more reasons why the camera can't use the flash.
But most of the time, the battery is not powerful enough to share the speed light. If nothing works, you should visit the Nikon service centre.
The reason it won't work is because when you went in to fix it, you shorted out the flash. That's what the flash was that you saw when you reconnected it to the main board. It's best not to open these and try to work on them yourself. There are steps to take when servicing electronics and it sounds like you forgot to drain the capacitor first. I'd suggest to go this site and see if they can help you www.camerasandparts.com They're very knowledgable with the Canon cameras and I'm sure they can get working just right again or maybe they can tell you the part you need to fix what you did when you were working on it.
This has happened to mine a couple of times. I cannot select flash, and the blur indicator is on most of the time.
Solution is to go into 'menu', select 'SET UP' then 'reset all'. My flash selection then works again.
Since one doesn't tend to set much up with a basic camera like this, resetting shouldn't cause any issues.
Hope this helps
Flash doesn't operate from various reasons. Try to reset your camera if you find in the instructions manual a procedure like that. If it doesn't work here are some possible reasons.
The flash works because a power inverter will charge a capacitor at about 350 volts. These are required to make a small lightning inside the flash tube. If the capacitor is damaged it will not charge, and the flash woun't work. If the invertor is damaged, it woun't charge the capacitor, and without those 350 volts the lightning inside the flash tube woun't go on. If the components that links the the camera's internal processor to the inverter circuitry doesn't work because of some failure to those components, again the inverter woun't work. Any shortcircuit or open circuit or imperfect contact can result in this. Even if the camera's firmware was corrupted in some way it could fail to instruct the camera to charge the flash circuitry. As you can see there are many reasons for that but only a service center can make the correct diagnostic. It isn't adviceable to dissasemble de camera yourself and tamper with the invertor circuitry as you are exposing yourself to those 350V. You may get some nasty electric shocks or damage other components.
Therefore, I think the best aproach to this problem is to have it diagnosticated and fixed by a specialised service facility.