HP Envy X360
Motherboard:Laduree 1.0 MB 14257-2
CPU:SR23W i7-5500U
KBC:ENE KB9028Q C
At first, the board was dead no lights nothing after connecting the charger.
After visual inspection, I noticed damaged components in the charging circuit:
PR4408, PR4415, PR4416, PU4406
I replaced them (including high side and low side MOSFETs PU4406 and PU4405).
Later on the 20th leg of the charger, I still had low resistance, so I replaced the charger chip
After replacing the charger chip I have a white led when I plug the charger.
At this moment laptop behave like this:
After I press the power button the light on the power button blink white for a second a fan twitch for a little
After further measurements, I've noticed no voltage 3.3v and 5v on coils PL4501,PL4502
Here are my measurements:
Resistance on coils :
PL4501 - Resistance in mega Ω
PL4502 - Resistance in mega Ω
PL4901 - 660k Ω
PL1 - Resistance in mega Ω
PL4701 - 62.9 Ω
PL4801 - 233k Ω
PL8201 - 21 Ω
PU4503
Pin 3 (VREG3) - 3.29v
Pin 6 (EN2) - 0v
Pin 12 (VIN) - 19.5v
Pin 13 (VREG5) - 5v
Pin 20 (EN1) - 0v
Resistance:
Pin 6 (EN2) - 12k Ω
Pin 20 (EN1) - 12k Ω
U2401
Pin 67 (AVCC) - 3.29v
Pin 91 (5V_S5_EN) - 0v
Pin 101 (3V_S5_EN) - 0v
Pin 103 (RSMRST#) - 0v
Pin 110 (ACIN#) - 0v
Pin 111 (VCC) - 3.29v
Looks like KBC doesn't issue a turn-on signal for 3v/5v driver chip.
I've tried to reprogram Bios and KBC chip with a dump from HP update and still, nothing changed, then I replaced KBC with a new one and programmed it with a dump from HP update and still nothing.
I'm out of ideas right now.
Thank you for any help and ideas on what I should do next.
Motherboard:Laduree 1.0 MB 14257-2
CPU:SR23W i7-5500U
KBC:ENE KB9028Q C
At first, the board was dead no lights nothing after connecting the charger.
After visual inspection, I noticed damaged components in the charging circuit:
PR4408, PR4415, PR4416, PU4406
I replaced them (including high side and low side MOSFETs PU4406 and PU4405).
Later on the 20th leg of the charger, I still had low resistance, so I replaced the charger chip
After replacing the charger chip I have a white led when I plug the charger.
At this moment laptop behave like this:
After I press the power button the light on the power button blink white for a second a fan twitch for a little
After further measurements, I've noticed no voltage 3.3v and 5v on coils PL4501,PL4502
Here are my measurements:
Resistance on coils :
PL4501 - Resistance in mega Ω
PL4502 - Resistance in mega Ω
PL4901 - 660k Ω
PL1 - Resistance in mega Ω
PL4701 - 62.9 Ω
PL4801 - 233k Ω
PL8201 - 21 Ω
PU4503
Pin 3 (VREG3) - 3.29v
Pin 6 (EN2) - 0v
Pin 12 (VIN) - 19.5v
Pin 13 (VREG5) - 5v
Pin 20 (EN1) - 0v
Resistance:
Pin 6 (EN2) - 12k Ω
Pin 20 (EN1) - 12k Ω
U2401
Pin 67 (AVCC) - 3.29v
Pin 91 (5V_S5_EN) - 0v
Pin 101 (3V_S5_EN) - 0v
Pin 103 (RSMRST#) - 0v
Pin 110 (ACIN#) - 0v
Pin 111 (VCC) - 3.29v
Looks like KBC doesn't issue a turn-on signal for 3v/5v driver chip.
I've tried to reprogram Bios and KBC chip with a dump from HP update and still, nothing changed, then I replaced KBC with a new one and programmed it with a dump from HP update and still nothing.
I'm out of ideas right now.
Thank you for any help and ideas on what I should do next.
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