Seems in a drop or knock flash board might touch metal and short out. When camera gets that error usually the main system board needs to be reset and it seems only trained service technicians have access to tools required to do this
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usually fast flashing charge is faulty battery its trying to get volts in to the battery. you see the battery has a charging board on the battery not in the camera the camera sends the volts to the battery and the battery tells the camera its voltage, and when at the right volts stops charging. but these batteries can only be charged to around 10000hrs depending on the type of battery. you see when you get a new battery you need to charge it before use, now this can be 6hrs to 12hrs for fist time use if you interrupted the charge or have a power cut while it charges it can damage the charging chip in the battery. if this does the flashing light on other batteries then the signal is not being read by the camera and the camera can be faulty on the charging circuit, usually (sometimes) removing the battery for a few hours can fix this but it will rest the camera. hope this helps you.
check for a blown fuse in the DC/DC board. Board is on top after you remove top cover, and the fuses are covered by a shield plate you have to unsolder. Fuses are very small and have letter codes like P or K
Hi! Try initializing the camera. Error 91 is a flash error in Sony cameras. It is probably a dead flash fuse on the motherboard (most common problem) or a faulty flash board. If you have a multimeter, I can help you locate and test the fuse and if you have a soldering iron - even fix it. My e-mail is email@example.com. Otherwise, you should contact your local Sony service center or other local camera service center.