I have this mb LA-A993 REV 2.0 and its not turning on. Dc jack light present. EC_RST# & EC_ACIN present but no EC_ON signal on KBC9012. EC_ON is the enable signal for RT8243A(PU301,pin 13) and hence i dont have +3VALW and +5VALW though +3V LDO and +5V LDO present on pin 15 and 14 respectively.
I have replaced KB9012 and programmed it with a known good dump, flashed main bios with HP virgin bios with correct BID. Still no EC_ON. Replaced PU301 also-same no result.
Impedance on all coils/jumpers checked and there is no short.
How to proceed further? Why EC_ON signal is not generated by kbc??
LA-A992P schematic i'm attaching and is same as LA-A993p. Btw, having same issue on another HP LA-A994P.
I have replaced KB9012 and programmed it with a known good dump, flashed main bios with HP virgin bios with correct BID. Still no EC_ON. Replaced PU301 also-same no result.
Impedance on all coils/jumpers checked and there is no short.
How to proceed further? Why EC_ON signal is not generated by kbc??
LA-A992P schematic i'm attaching and is same as LA-A993p. Btw, having same issue on another HP LA-A994P.
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