The same kind of ones mentioned in this thread
viewtopic.php?f=11&t=3089
Well after assembling a few of them I could not get the ESP-12E to power up.
Discovered that the manufacturer is now installing 10k resistors on all 3 pads. This is a mistake, the middle one should be a shunt or 0 ohm resistor.
So if you have one of these and wonder why the VCC pin doesn't power the unit this is why.