No VIN/ DCIN

a. DC JACK LOOSE,OPEN,INNER CYLINDER CONTACT PROBLEM OR CARBONIZED

b. SERIES BID COIL OPEN,FUSE OPEN OR DRY JOINT

c. IF ADAPTER LED BLINKS,LINE SHORT OR PCB BURNT, PARALLEL DIODE SHORT

d. Adapter TRIP due to B+ SHORT OR INCOMPATIBLE ADAPTER

e. Reverse connected DC JACK in older model

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NO B+, DCBATOUT

a. B+ LINE SHORT TO GND,LCD CABLE BURNT,BURNT DECOUPLING CAP ON B+ LINE

b. ACFET,RBFET D-S -G SHORT,NO GATE VOLTAGE OR 19V GATE VOLT ON P-CH MOSFET GATE

c. No ACDRV, NO ACDET, Low ACDET OR ACOK,REGN DROP

d. Charging Chip VIN TO GND SHORT and therefore series resistor open

E. Charging chip REGN pin SHORT TO GND

f. HIGH SIDE MOSFET FAULTY OF ANY OF THE CONVERTER SUPPLY CAUSES OCP ACTIVE. B+ IMPEDANCE LOWERED UNDER 100

g. ADP_EN Logic fail

h. CLEAR CMOS IN SONY HKx Series to Discharge Latch Circuit activated prior

i. M2A 6pin BI- TRANSISTOR FAULY in U8x Series ACFET Gate Driver

j. INCOMPATIBLE CHARGER OR LIMIT SIGNAL PIN ISSUE IN PROBOOK SERIES

k.BATFET SHORTED D-S ALSO CAUSES ADP TRIP

l. IF TRIPING OCCURRED WITH BATTERY, Charging converter problem, check BST RESISTOR OPEN in CHARGING SECTION

m. NVDC charger BUCK BOOST CONVERTER NOT STARTED due to Asgate low

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LOW B+ SUPPLY

a. IMPROPER ACFET,RBFET GATE VOLT OR WRONG CHANNEL MOSFET MOUNTED

b. OCP TRIPS, NO CMSRC VOLT

c. FAULTY BLUE PIN CONVERTER IN HP

d. Faulty CHARGING CHIP, NVDC CHARGER

e. B+ TRIP,Power Cycles; OBSERVE ON DSO SCAN MODE

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NO LDO 3VL

a. No B+ to 3V CONVERTER CHIP, SERIES RESISTOR OR DIODE OPEN

b . No ENLDO, RESISTOR DEVIDER OPEN, CHIP SHORT, CAP LEAKAGE (as in LA-9632P)

c. SHORTED LDO LINE DUE TO FAULTY EC,RTC SECTION,LDO CAP SHORT (PC228 in QUANTA R62)

d.3V Chip itself faulty,Pads open, EN pin low voltage or impedance.

e. IF CHIP HAVING ONLY 5V LDO OUTPUT THAN 5V TO 3V CONVERER CHIP EXIST, Check EN OR SHDN#

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NO Power to KBC/ SIO CHIP

A. Verify PSL Logic if any,Q2402 IN CEDAR INTEL

B. If KBC Power pins supplied from ALW Supply than check ECON/ALWON/S5ON/S5_ENABLE/MAINPWRON,/ACIN etc FOR HIGH LOGIC

C. VBAT AND LDO PIN KF KBC SHOULD BE OF 3V LEVEL

D. CPPOWER EN INVENTECH MAINBOARDS

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NO 3V 5V SUPPLY

........................To be continue