Samsung 300E 4A No display problem

[razu]

Hy I have a samsung I3 300E4A laptop which problem is no display its all voltage is OK ...... its V core (processor) is 3 Coil, but 2 coils are 1.15v one is 0 volt its voltage come from a dual mosfet the mosfet have no gate voltage but the gate is come direct from Ic . but laptop power running, I heat the chipset clear dust on circuit, still no success

when i powerd up the dc power supply, then its stop on 0.660 amphare

Please suggest me any help

[dj_ricoh]

Re: Samsung 300E 4A No display problem

start with diagram!
we need it!

everything its useless. or you can find where that coil comes from (with 0 V)

trace it on board what QFN chip gives power

[tata123]

Re: Samsung 300E 4A No display problem

Check the QFN and the black SMD's!

[razu]

Re: Samsung 300E 4A No display problem

diagram is

hy friend I have open this dual mosfet which drive the vcore voltage and then resolder it again wowwwwwww its displayed but start on 1 hour then its display is gone again

is the dual mosfet is AON6908A faulty or V core Ic. its number ISL 95831) and this Aon6908a Gate voltage directly come from V core Ic. i
Please give me any help