LENOVO G580 DEAD, A-7982P
Posted: Wed Apr 04, 2018 12:42 pm
I CHECKED LENOVO G580 AS IT WAS DEAD. NO CHARGING LED WAS GLOWING WHEN ADAPTER
CONNECTED.3.3V & 5V AT SMPS COIL WAS MISSING. BATTERY PORT VOLTAGES WERE MISSING.
19V WAS PRESENT AT ALL REQUIRED PLACES.NO SHORT. CHANGED FIRST PWM MAIN IC, THEN
CHARGING IC. BUT NOT SOLVED. PWM IC NO EM=ED. THEN I HAD PROGRAMMED IO CHIP
KB9012QF-A3 BY RT809F. IO PIN 33 & 37 NO WAS CARRYING 3.3V. THEN SMPS COIL
GOT 3.3V & 5V & BATTERY PORT ALSO BECAME OK. BOARD OK. ,MB LA NO 7982P.
CONNECTED.3.3V & 5V AT SMPS COIL WAS MISSING. BATTERY PORT VOLTAGES WERE MISSING.
19V WAS PRESENT AT ALL REQUIRED PLACES.NO SHORT. CHANGED FIRST PWM MAIN IC, THEN
CHARGING IC. BUT NOT SOLVED. PWM IC NO EM=ED. THEN I HAD PROGRAMMED IO CHIP
KB9012QF-A3 BY RT809F. IO PIN 33 & 37 NO WAS CARRYING 3.3V. THEN SMPS COIL
GOT 3.3V & 5V & BATTERY PORT ALSO BECAME OK. BOARD OK. ,MB LA NO 7982P.