Samsung S7 GOLD DEAD(received as dead handset in good cosmetic condition no evidence of water damage)
Original observed behaviour DCPS 0mA B4 PTB, PTB 70mA release power button back to zero
Several replacments of PMIC has left the behaviour unchanged
Bad board
DCPS 0mA before PTB
DCPS PTB 60-70mA. Remove tweezers from power on pins drops back to zero
known good board
Am wondering whether this could be a case of dead CPU rather than dead PMIC
Original observed behaviour DCPS 0mA B4 PTB, PTB 70mA release power button back to zero
Several replacments of PMIC has left the behaviour unchanged
Bad board
DCPS 0mA before PTB
DCPS PTB 60-70mA. Remove tweezers from power on pins drops back to zero
- Main power rail IS present
- Power on signal (PWR_ON)from power button press present
- Power On - AP_PS_HOLD 1.8v?✘
- No PMIC voltages
- The seated resistance on the main power rail as compared to known good checks ok.
known good board
- PWR_ON (4.0v) and AP_PS_HOLD (0v ->1.8v)
- AP_PS_HOLD 1V8 persists
- AP_PS_HOLD 1V8 inputs to both PMIC and CPU.
Am wondering whether this could be a case of dead CPU rather than dead PMIC
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