ELITEBOOK 840 G5 MODEL WHILE  ADAPTER PLUGGED, NO POWER ON BUT ACLED CONT..BLINK 

                                               BIOS WF AS ABOVE:   FAULTY vs GOOD 

FINDINGS ARE BLEOW:

1.  FAULTY WF U7001  EM5209VF NOT TRANSFER VOLTAGE OUTPUT

2. CT1 CAPACITOR PF LEAKAGE SHOWN IN PICS WHITE OVAL

3. BIOS PIN2 OK WF WHILE SWITCH TRANSFER PROPERLY AFTER RECTIFIY FAULT

Replaced faulty Cap and Now LED BLINKS FOR 3SEC AND STABLE AMBER

Power on auto while NO CMOS  present

 ALL OK