Technical Support msi ms-16j9 charging but not turn on

[mobile91]

I have a ms-16j9 the laptop charge the battery but not turn on when i press the power button
on the power swich the voltage is 3. v
plz help me

 

[Ahmad Safari]

You should check if the switch button is healthy?
Check the motherboard ohms to make sure there is no connection from the board.
Check the voltage from the input jack to see how much voltage is available.
Check that Alois voltages include 3.3 and 5.1 volts.
Check the BIOS and program if possible

 

[mobile91]

You should check if the switch button is healthy?
Check the motherboard ohms to make sure there is no connection from the board.
Check the voltage from the input jack to see how much voltage is available.
Check that Alois voltages include 3.3 and 5.1 volts.
Check the BIOS and program if possible

voltage from input jack 20 v
voltage on power swich 3.5 v
i reprogram the bios
the laptop charge the battery normaly
but no power

 

[Ahmad Safari]

voltage from input jack 20 v
voltage on power swich 3.5 v
i reprogram the bios
the laptop charge the battery normaly
but no power

I will give you an explanation of the process of turning on the device so that you can troubleshoot more easily.

At first, 20 volts enters the charging circuit from the input jack.
There are two MOSFETs in the charging circuit that are placed to protect the circuit.
If no fault is detected in the circuit, the charging IC turns on these two MOSFETs and the voltage of 20 volts enters the motherboard without voltage drop.

Some laptops, such as Dell and HP, include a detect adapter signal, and until this signal enters the board, the system will not turn on or the charger will not be detected, etc.


The voltage that enters the motherboard is the main voltage of the motherboard, which we call B+.
The rest of the system voltages are generated from B+ voltage.

At first, the voltage of 3.3 volts is produced by the IC power regulator, which is the main power supply of the EC .
EC needs a clock to start working after the supply voltage is supplied. This clock is produced by the 32.768 crystal, which can be measured with an oscilloscope.
EC includes a program that may be inside the BIOS or EC that specifies the operation of the EC.
Through EC , the signal of the switch button is recognized that if we press the switch button, the AC recognizes that we have given the order to turn on.

Here, the EC instructs the PCH chipset to turn on.
After checking, PCH gives the required signals to EC, which can be checked according to the power sequence in the schematic.