Technical Support Acer Swift SF314 no power

[Tsiga]

Hello!
Acer Swift SF314-42
MB: FH4FR LA-J731P rev: 1.0

I have a problem with this laptop which No DC power after the first mosfet. In first mosfet source pin present 19V DCIN, In gate pin present: 18.4V, but in drain prin the voltage is 0V.
I also tried with Dc adapter and Lab. supply
I took it off the motherboard and i tested with multimeter each marked mosfet.
Each mosfet are opens and closes when i touch, but the PQB3 is Open and close after 1-2secound when i measure with multimeter between drain/source pin.
I measure resistance to ground in DCIN rail from DC connector to PRB3 all values Kilo and Mega ohm.
I couldn't identify it : NIKOS PK5N2EA
Have anyone any suggestion?

 

[ilhanb]

Hello!
Acer Swift SF314-42
MB: FH4FR LA-J731P rev: 1.0

I have a problem with this laptop which No DC power after the first mosfet. In first mosfet source pin present 19V DCIN, In gate pin present: 18.4V, but in drain prin the voltage is 0V.
I also tried with Dc adapter and Lab. supply
I took it off the motherboard and i tested with multimeter each marked mosfet.
Each mosfet are opens and closes when i touch, but the PQB3 is Open and close after 1-2secound when i measure with multimeter between drain/source pin.
I measure resistance to ground in DCIN rail from DC connector to PRB3 all values Kilo and Mega ohm.
I couldn't identify it : NIKOS PK5N2EA
Have anyone any suggestion?

Kardeşim DC jack değiştir daha önce bende aynı problemi yaşadım

 

[Ahmad Safari]

Hello
Two situations are possible.
In the first case, the charging circuit has problems, such as input MOSFETs or IC charging and charging circuit components.
In the second case, a connection in the other part of the motherboard protects the circuit and cuts off the integrated circuit of the input MOSFET.

You measure the diode resistance of different parts, such as B+, 3V and 5V power and etc.
Usually, a connection in +B voltage causes this problem.