hi all
here i've a laptop that it turned on,but not show anything in display(lvds or D-sub)

when i remove evrything(cpu,ram,vga) n plug dc jack,it turned on without press power buttun and use 0.4A,and power,charge and hdd led is on
i find an object that its too hot ,thats it

i remove it,but no change

when i plug cpu,it use 0.9A
and when i plug vga use 1.3A

all volages are ok
i programm bios
replace cpu n ram
but no change happened

what should i do?!

tc7sz08fu PLT_RST#

i remove all parts (cpu,ram,vga,bios) and see that it use 0.1A

i find that 5V is about 2V and lan ic(ar-8151) is warm
next i remove 8151 , 5v back to normal and it working properly and i see display

i hav new problem now

when i press power buttun,it restart 3 time next boot up
i program asm1042 flash ,but not change anything

do u know any other reason that it not boot directly?

any help?

Usually 3 restart it's a problem with USB 3.0 controller or this controller firmware.

reset problem solved by replace usb3 controller(asm1042)
but i have new problem now:((

i can just use maximum a 2GB memory module

if i put 2gb modules on each slot,it work and boot up
but when install 2x1GB,2x2GB or 4g module,it use about 1.7A
after some moments usage increase to 2.3A for some secends ,then restart

any idea?

it done with bios programing

tnx all