i have a sony laptop mbx-266 with no display the power is ok with all supplies okay cpu voltage and gpu are all okay i changed the graphic 216-083000 stilll no display but there is one thing i notice that the machine has booted as the screen is blank but on the keyboard when we press nu lock and caps lock the lights come on. now confused where the problem is also no display on the ext monitor.there are no schematics can anyone tell me what more can i check

Reflash it!Or bad graphics,amd 3000 often dies

Friends this mbx266 is getting very exciting to repair i have changed the graphics amd bga 2 times today reflash the bios with 4times the ec and pch bios also today changed micom and pch hm77 my friends now the question is only video ram or some small resistor or broken track and not having schematics is makin it very difficult.
By the way i got another same model for repair and that does not power on so changed micom bios and pch still same problem i am stuck with 2 similar identicle board the only difference is video ram used are different one board is hynix the other samsung but i located the resistor config for vrams so now time to do more research on this model i have never worked so much on any laptop than this model

Okay second one power problem repiar 1k open resistor open for 3.3v_5v enable from micom to rt8223g pin 18 enc.now machine comes only and no dsiplay lsame only num lock and caps lock led light come on when we press at the keyboard.