Check the USB RVP line near the charging IC. Use a multimeter to verify if the 5V from the USB is passing through the protection transistors/mosfets to the rest of the board. Related ICs: Tigris/Yang: The primary charging managers.
: Look for cracked capacitors or discoloration around the charging IC. pp-var-usb-rvp
. When this line fails, your device typically won't charge or may not turn on at all. What is PP_VAR_USB_RVP? The name provides clues to its function: : Power Positive. Check the USB RVP line near the charging IC
: Modern fast-charging standards like USB Power Delivery (PD) require devices to handle fluctuating voltages—from standard 5V up to 20V or higher. The "VAR" in this rail's name highlights its capacity to accommodate these shifting levels safely. pp-var-usb-rvp