MSI MS-16P51 No power

[johnbeton]

Hello,

I'm working on a MSI MS-16P51 board, that does not power up. The charging led lights up, but system doesn't power up.
There is no 3.3v on powerbutton, and no 3.3v on bios chip or coil.
5v is also not present.

I suspect TPS51225, but what is the best way to test this ?

thanks a lot.

[Techtiger]

Re: MSI MS-16P51 No power

+5V line what is the value resistance to GND ? If it’s low remove the coils and test which side is short

[johnbeton]

Re: MSI MS-16P51 No power

if I measure on the coil, the resistance starts from around 5k Omhs and slowly goes up to around 11k Ohms

[johnbeton]

Re: MSI MS-16P51 No power

The powerbutton now has 3.3v, when I push the powerbutton 3.3v and 5v are present for +/- 5 seconds, than turn off. I get no voltage on ram-coil PL12

[Techtiger]

Re: MSI MS-16P51 No power

The powerbutton now has 3.3v, when I push the powerbutton 3.3v and 5v are present for +/- 5 seconds, than turn off. I get no voltage on ram-coil PL12

In your case +3/5V SUS TPS generate this voltage after pressing power button
+3/5 ALWS is VREG 3/5 for the moment this line is fine , test on EC RSMRST#
PM_PWRBTN# voltage are present as you press the power button

[johnbeton]

Re: MSI MS-16P51 No power

Both RSMRST# and PM_PWRBTN# are 3.3v when pressing the power button.
PM_SLP_S5# and PM_SLP_S4# are both 0v

[Techtiger]

Re: MSI MS-16P51 No power

Ok now test if these voltage are rising up when you press the power button +V1.8VSUS +1.05VSUS , did you flash bios with a working bin?

[johnbeton]

Re: MSI MS-16P51 No power

both lines come up when power button is pressed, 1.05v is a little higher (1.15v).
After 5 to 6 seconds they die.
I tried a confirmed bios from this forum, but problem remains.

[Techtiger]

Re: MSI MS-16P51 No power

Can you check near PCH if any cap or resistor gets 3VSUS as you press PWRBTWN and test all the pin pic

[johnbeton]

Re: MSI MS-16P51 No power

Ok, i tried my best to measure this.
I have +3VSUS on c1063 near the PCH when I press the power button.

SRTCRST# = 2,75V -> 2,50V when button pressed
BB47 R579 = 0V -> 3,3V when button pressed
PCH_INTRUDER# = 2,75V -> 2,50V when button pressed
BATLOW# = 3,3V
AC_PRESENT = 3,3V
BE41 R568 = 3,3V
EC_RTC_RST = 0V -> 3,3V when button pressed
RTC_RST = 2,75V -> 2,50V when button pressed
SRTC_RST = 2,75V -> 2,50V when button pressed
XTAL24_OUT_JNC = 0V
XTAL24_IN_JNC = 0V

[radear]

Re: MSI MS-16P51 No power

hi guys im working in the same board. I notice that if i prehot the ec the computer starts, but with the ec cold, nothing happens..im ordering an new ec..