DELL LATITUDE E6420 NOT CHARGING ISSUE
Posted: Fri Aug 12, 2016 7:30 pm
DELL LATITUDE E6420 NOT CHARGING
MB- PAL50 LA6591A
PROBLEM- NOT CHARGING
WHEN PUT BATTERY IN LAPTOP IT DOESN'T POWER ON
BOARD ON ONLY WITH ADAPTER
CHECKED IN BIOS 65 WATT ADAPTER IS DETECTING BUT IN IDLE CONDITION ( NOT CHARGING)
CHECK IN BOARD FOUND +VCHRG LINE IS SHORTING
PQ31 & PQ33 BOTH MOSFET ARE SHORT
PQ31 IS 4720 AND PQ33 IS 4820B
BOTH MOSFET ARE N CHANEL BUT PQ33 (4820 IS N- CHANEL 30V WITH SCHOTTKY DIODE)
RESOULATION
REPLACE 4720 (PQ31) WITH 4800B (N- CHANEL 30V MOSFET)
REPLACE 4820 (PQ33) WITH 4812B (N-Channel 30-V (D-S) MOSFET with Schottky Diode)
CHECKED IN BIOS BATTERY CHARGING FINE
NOW LAPTOP WORKING FINE WITH BOTH BATTERY & ADAPTER( 65W)
CHARGING SUCESSFULLY
MB- PAL50 LA6591A
PROBLEM- NOT CHARGING
WHEN PUT BATTERY IN LAPTOP IT DOESN'T POWER ON
BOARD ON ONLY WITH ADAPTER
CHECKED IN BIOS 65 WATT ADAPTER IS DETECTING BUT IN IDLE CONDITION ( NOT CHARGING)
CHECK IN BOARD FOUND +VCHRG LINE IS SHORTING
PQ31 & PQ33 BOTH MOSFET ARE SHORT
PQ31 IS 4720 AND PQ33 IS 4820B
BOTH MOSFET ARE N CHANEL BUT PQ33 (4820 IS N- CHANEL 30V WITH SCHOTTKY DIODE)
RESOULATION
REPLACE 4720 (PQ31) WITH 4800B (N- CHANEL 30V MOSFET)
REPLACE 4820 (PQ33) WITH 4812B (N-Channel 30-V (D-S) MOSFET with Schottky Diode)
CHECKED IN BIOS BATTERY CHARGING FINE
NOW LAPTOP WORKING FINE WITH BOTH BATTERY & ADAPTER( 65W)
CHARGING SUCESSFULLY