Repairing a pair of digital scales

In the top right quadrant of the pcb I can see points marked GND, VIN, VDD and VCC. I'd start by looking at the voltages there.
 
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I cleaned some of the connections and checked the voltage of the batteries. All fine. Put the batteries back in and the LED lit up and started working..
 
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With some things, sometimes just removing the batteries and refitting them again resets things
 

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