Hello ,
I'm trying to repair X556UJ ver.2 laptop mainboard. Board came with damaged USB 3.0 connector that I have desoldered, but board is dead, no led is on.
I have boardview and some repair guide for version 1.0 and I have 3.3v on power button.
I have measured some voltages on first regulator and I have +3va, +5va , this is the only heating element and on pin 14 +5VSUS voltage is 0V.
On battery connector rtc_ldo 3.3v is 2.8v, and on SIO ec_on is 3.3V. On the BIOS leg 8 is giving only 1.0V . PS_ON voltage is OK, but ME_AC_PRESENT is 0.2V
I have measured all the big coils with ground and the lowest resistance is on +3VADSWO - 1.5ohm and on +1VSUSO - 0.4ohm. Only coil that have voltage is P_CHG_SENSE that is 0.4V.
No fet seems to be damaged, and there is no change if I press power button, the board is taking only 50mA.
I have no idea if it is the heating regulator or something else, can you help me ?
Thanks.
I'm trying to repair X556UJ ver.2 laptop mainboard. Board came with damaged USB 3.0 connector that I have desoldered, but board is dead, no led is on.
I have boardview and some repair guide for version 1.0 and I have 3.3v on power button.
I have measured some voltages on first regulator and I have +3va, +5va , this is the only heating element and on pin 14 +5VSUS voltage is 0V.
On battery connector rtc_ldo 3.3v is 2.8v, and on SIO ec_on is 3.3V. On the BIOS leg 8 is giving only 1.0V . PS_ON voltage is OK, but ME_AC_PRESENT is 0.2V
I have measured all the big coils with ground and the lowest resistance is on +3VADSWO - 1.5ohm and on +1VSUSO - 0.4ohm. Only coil that have voltage is P_CHG_SENSE that is 0.4V.
No fet seems to be damaged, and there is no change if I press power button, the board is taking only 50mA.
I have no idea if it is the heating regulator or something else, can you help me ?
Thanks.
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