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I tried the same on my old S7 Edge. I tried an external power supply directly to the connector on the board and also with the small PCB that was attached to the old battery but I couldn't get a boot. Probably the board got damaged somehow.Hi again,
So I connected this ribbon cable to my PSU @3,9 V and it works fine. I kept the charging control PCB on the flex and simply hooked up the terminals. I haven't got a LCD on the phone so atm it is a bit tricky to monitor the stats but the battery percentage was around 65% after boot and dropped to 60% now, constantly dropping. I can see this as I run the system as a webcam and have the battery percentage on the OSD of the webcam interface. I will keep it overnight and see if it will turn off at some point.
@AYBFunkyMonkey I saw your picture of the cut off flex and I think you mixed up the polarity of the terminals, maybe that's why it didn't work?
The difference was that I cut the PCB flex cable and I shouldn't have done it. So, I scraped the small remain of flex cable next to the PCB, tinned it with solder and soldered wires to make a bridge between the PCB and the flex cable. I can measure the correct voltage at the end of the flex cable connector, so the PCB is working even with the flex cable home made bridge.
However, when I connect the flex cable to the conenctor on the board and turn the external power supply ON, the external power supply shows a current consumption of 0A. Only when I press the phone power button, I see around 180mA of current but it's only while I keep the power button pressed. As soon as I release the button, the current drops to 0A.
Mod:link to old thread
https://forum.allaboutcircuits.com/...-s7-power-without-battery.149822/post-1736444
Last edited by a moderator:
