Hi
laptop had problem with lcd flat cable,somebody attempted to repair it,but shorted flat cable damaged laptop and now it has no screen(black screen).
every cores create true voltages,The LPC bus is active,debug card indicates code 27(oem pre-memory initialization codes)for a while then code F9(recovery capsule initialization codes).
help plz..

Hi.
Replaced GPU by new one solved the problem but a little issue,..there is a problem with led back light.Screen tested and flat cable is new.
supplying voltages on cn2 ( screen flat connector) are these :
pin1,2 = +3VLCD_CON =+3.3v
pin5 =3.3v
pin29 =+5v
pin 39,40 =19v
help about this please,Which pins are related to led back light?

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[size=85][color=#DA573B]Posted after 7 minutes 18 seconds:[/color][/size]
I think about dpst_pwm and blon_conn ..

what on BLON_CON (37 pin)???

dpst_pwm and blon_conn are both +3.3v.
problem solved.pins 39 and 40 (+VIN_BLIGHT)of lcd connector on the board are crooked and the lcd step up circuit could not receive +19v.