acer AOD 725

at a glance looks totally dead but a 19V check starts from jack until battery fet (PQ25) is present. schema page 21.cek 19V on upper n chanel (PQ40) source pin 5,6,7,8 present..check 19V on upper n chanel (PQ44) pin 5,6,7,8 present .. 3V_ALW check on PL 9 (schema page 22) present 3V..check 5V_ALW on PL 10 Present 5V ... Terms motherboard for life already present. but not in switch .... 3VSB check on power switch SW1 only present 1.2V. 3V injection from PSU replacement VSB (power switch) 3V and try swith msh not response. RSMRST # on EC PIN 75 (Shema page 20) 3.3V not present check DNBSWON # pin 91signal switch to SB 3.3V present. Measurement leads to Bios. After repeatedly searching for matching and tested files and replacing the new bios IC, the results still can not be in the swicth
Start suspicious to EC but pin 91 sdh issued signal 3.3V to turn on SB. check again bios area U16 (schema page 9) continuity test foot leg bios towards EC pin 1,2,5,6 turns pin 2 disconnected to EC and R361 lost mngkin flying at time of pull of pairs of IC or by technician before. measuring again pin 75, alhamdulillah present 3.3V.Sek VSB voltage on SW1 3.3V present.Switch ON problem resolved .. Acer 4741 ga sweat case can switch sdh replace EC and SB still not complete check BIOS IC U39 pin 2 and R505 jg lost ., put resistor "" JRENK "" case of Solved and Closed. Hope can be inspiration.