Improper CC1-CC2 Communication  found culprit behind it.

ADAPTER PLUG VBUS TOGGLE 3-4 V

Found 5V PJP40 SHORT

5VS SUPPLY LOW IMPEDANCE

BY TRACING FOUND AUDIO CHIP FAULTY ,REPLACED BUT STILL NO POWER

NOW IMPEDANCE GOOD ON 5V LINE BUT no 20V VBUS,NO PWR ON

MULTIMETER SHOWS 5V VBUS Only

PU3 PIN3. 3.3V

UPD7 PIN8 PULSATING,CC1 WF TOO LONG

REMOVED ESD PROTECTOR BUT NO CHANGE

A PD Controller 65992S near DB found short, removed all Ok with another port.

Check: When battery detected B+ Increased to battery voltage level from initial 8.6V TO 16.2V