hello masters

this laptop at the first came for no turn on
i find kbc damage and replace it

now it turns on but no display
use 1.3A and restart after 30 sec
voltages are good

i flash bios,replace kbc again but no change

anyone has any idea whats wrong here?
tnx all

clean the socket of RAM, did you try it?

yes,try with diffrent ram and souket
no change

Is the motherboard has a discrete chip?

yes
ATI chip

I guess the problem is on this chip.
But, what about the voltages on L44, L35, and vcore?

but customer said it was ok befor turning off!

L44=1.1V
there is no L35

So, the motherboard discrete only.
btw, what about the voltage on vcore?

Tip: Mmmm, for confirming its a vga chip problem, I usually blowing at the bottom side of the chip with hotair, mostly it will give a display a moment, and then re-balling or replace the chip, depend on the customer wants.