4520 (S-Class Intel) no display

R EZ A

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

and555

clean the socket of RAM, did you try it?

R EZ A

and555 писал(а):

clean the socket of RAM, did you try it?

yes,try with diffrent ram and souket
no change :-(

and555

R EZ A писал(а):

no change

Is the motherboard has a discrete chip?

R EZ A

and555 писал(а):

R EZ A писал(а):

no change

Is the motherboard has a discrete chip?

yes
ATI chip

and555

R EZ A писал(а):

ATI chip

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

R EZ A

and555 писал(а):

R EZ A писал(а):

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

and555

R EZ A писал(а):

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.

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4520 (S-Class Intel) no display

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