HP ENVY X360 15-EU0005NA 203037-2 does not turn on, something whistles on the board.

[brzostos]

Hello, HP laptop model 15-EU0005NA. It does not turn on, 1 in 100 manages to turn it on then after a while it freezes/disappears/flashes, etc.

After removing the motherboard and connecting the board with RAM to the power supply, I noticed that at first all voltages start correctly and after a few seconds 3.3V on the PL4501 coil disappears and somewhere in this area something starts beeping on the board, sometimes after touching it with a finger in the area of PL4551 it stops beeping and 3.3V appears again.

Original HP 150W power supply, the diode in the power socket lights up all the time.

I replaced the 3.3V converter with a new one (SY8386BRHC) but the effect is the same. I do not have access to boardview or the board schematic.

PL4501 - 7kΩ - 0V-3.3V
PL4551 - 4MΩ - 5V
PL4401 - 50kΩ - 2.5V
PL5301 - 4kΩ
PL5101 - 23Ω
PL4702 - 3.5Ω
PL4701 - 3.5Ω
PL5202 - 6Ω

Sorry for my English, I hope the translator helped me enough that the topic is clear to you.

[brzostos]

Maybe someone has a boardview or a schematic for this motherboard?
I need a verified kbc and bios dump. I'm thinking about trying to replace the KBC with a new one.

[SMDFlea]

Schematic requests go here - https://www.badcaps.net/forum/troubl...-requests-only

[quic307]

Maybe someone has a boardview or a schematic for this motherboard?
I need a verified kbc and bios dump. I'm thinking about trying to replace the KBC with a new one.

Hello brzostos, did you fix that problem?
I have two with the same problem. ...

[Roma Gherasimciuc]

Hi, i have the same issue as yours, did you fixed that problem ? I have 8 units with the same issue