Life is full of stuffs to fix / repair. Today I had a little cute thing: a vtech baby phone. After ~half a year of infrequent use, the unit started turning off by itself a few seconds after being turned on. Battery should have been okay, since the light turns on and speaker volume (turn-on melody) was moderate for the first few seconds. I suspected lead solder for power switch cable was loose. But everything looked great when I opened the back cover. A bit of Google search says low battery can cause a number of unwelcomed behaviors. So I replaced battery just in case, and voila! It works. Probably its electric circuit has some protection against low input voltage.
Reassembly took some time since I took it apart way too much, but I am happy that the unit is back in service.
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