https://www.badcaps.net/forum/troubl...9-2v-thank-you
I was asked to start my own thread and would now continue working from the thread here.
Remove all power. Meter in resistance mode. Measure the resistance (not DIODE mode) to ground of VSYS_OUT. This is the main power rail that powers the logic board. Checking if this main power rail is shorted which will be sensed by the charger IC and cause the DCin path mosfets to turn OFF.
If this resistance is not low, proceed...
Review the next stage of this circuit @ dual mosfet PQ101. What voltage to ground do you see on PL101 ? This leg of the circuit is driven by the charger IC @ PU101.
If there is a low or no voltage on PL101, then proceed to investigate the PU101 IC.
(Carefully) Measure the voltage to ground of:
VBUS ; pin 1
REGN ; pin 28
Post each measurement.
Coil PL101 Volt to ground 0,298V
VBUS ; pin 1 = 20 Volt
REGN ; pin 28 = 6 Volt
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