I have now this OPPO R831K, the customer said it doesn't powered on, but it can be charge. The first things that comes to my mind is a faulty switch. I dismantle the unit. Check the flax switch most especially the membrane. Maybe there's a corrosion at the bottom of the membrane. But there's no corrosion. Next step is connection checking. I checked the connection from both side of the switch going to the 2 connection that will be connected to the board. I found out that the other connection is open. So what are we going to do with that? Just apply a jumper, and problem will be solve.
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