MSI GE62 6QF MS-16J41 not reacting to power button

[questore]

Hi Guys,

This laptop came to me as a gift, and know nothing about it. I would like to fix it.

When plugged in without battery nothing happens.
If I plug the battery then connect the power supply, blue LED lits up in the front.

After cleaning the DCIN mosfet area (black burn residue was present near the first 2 mosfet)
+ 3.3v is present on the power button and when pressed it goees 0v for a second, but no other reaction on the laptop.
+ Measured 5.1v some places
+ Board Taking 0.010mA when charger plugged in.
+ Flashed the BIOS from this forum with exact modell number (no change)

Attaching a schematic - IC numbers are somehow different then my board (example: schematics U41 BIOS IC on my board is U43)

Can you give me an idea where to go?

Schematic: >>click here to download<< ---> https://www.badcaps.net/forum/showth...96#post1233196

[questore]

Re: GE62 6QF not reacting to power button

After looking carefully on the board with my microscope. I have noticed that 2 resistors seem to be miissing next to BIOS chip (BIOS IC was drowned in flux residue so assuming someone messed with it)

Attached picture with red marks on the assumed missing resistors.


Pin 3 and 7 should be connected to +VCCSPI trought 1KOhm resistors.
Now they are 1MOhm and 10 MOhm measured. (Page 24 in schematic.)

Someone Please confirm my action before proceeding with solder iron.

[questore]

Re: GE62 6QF not reacting to power button

Checked it on another working board and it also has nothing on that mark.
Back to square 1.

[questore]

Re: GE62 6QF not reacting to power button

Done some more board cleaning, now 3vsus and 5vsus come alive when power button pressed. Going forward.

[questore]

Re: GE62 6QF not reacting to power button

Other schematic seemed to be not for this board altough the first page write ms-16j4. Attaching another that is correct.
Following this docu I found out that SUSPWROK is present from the TPS51225CRUKR chip when power button pressed, but never arrives to the EC chip 109 pin.

Tryed to follow the trace but it instantly disappears after the pin out and the KBC chip 109 pin comes from somewhere the bottom of the chip so I wont see anything. Tryed to discover the other side of the board but dont see any suspicious thing.

NEXT STEP: solder a thin wire to SUSPWROK OUTPUT and solder OTHER SIDE it to the pin 109 of the KBC. Anyone disagrees?

[piernov]

Re: GE62 6QF not reacting to power button

MSI GE62 6QF is a Skylake platform. MS-16J4 is a Skylake platform, MS-16J2 is a Haswell platform, they use different ECs. In any case, the board model number should be written somewhere on the board.

Additionally, please link to topics in the Schematic subsection rather than uploading schematics in your post here.

[questore]

Re: GE62 6QF not reacting to power button

MSI GE62 6QF is a Skylake platform. MS-16J4 is a Skylake platform, MS-16J2 is a Haswell platform, they use different ECs. In any case, the board model number should be written somewhere on the board.

Additionally, please link to topics in the Schematic subsection rather than uploading schematics in your post here.

Point there, I forgot to write the modell number, I was certain I did, but no. Thank you. I will also check the KBC number if it is correct with schematic.

Modell number is: Ms-16j41

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Since my board is ms-16j41 v1.0 it was hard to chase down because the schematic was Rev0A. but found that APL5930 is memory voltage regulator is presenting 1.2v on VOUT and NOT give out +2.5V_MEM_PWRGD signal.
pins measured after powerbutton pressed:

#1 GND - 0v
#2 - FB - 0,81V
#3 - VOUT - 1.21V
#4 - VOUT - 1.21V
#5 - VIN (3vsus) - 3.1V
#6 - VIN (5vsus) - 5.12V
#7 - POK - fluctuating 0-2v even when no powerbutton pressed
#8 - DIMM_ON_2V5 (Enable) - 3.35v

The schematic Page 41 shows a 4.99K resistor between VOUT and FB but I have measured 1.32KOhm (could it be because a different board revision)
Should I replace the Regulator?

[piernov]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

You are measuring +1.2VSUS not +2.5V_MEM.

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

You are measuring +1.2VSUS not +2.5V_MEM.

Yes you are right, there is 2 chips of APL5930 and I have measured the other one.
But, does it need to be replaced? It seems faulty to me.

[piernov]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Nothing looks wrong there.

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Next, I have found the 2.5v IC.

pin 5 - 3V (+3vsus)
pin 6 - 5v (+5vsus )
No voltage on DIMM_ON_2V5 Enable signal (pin 8)
no output voltage on pin 3-4
also checked ENE9028 ic pin 16 but no 3.3v there either

In schematic I did not found any G3-S0 flow diagram so i don't know what to check next. Any idea?

[mon2]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Perhaps review the schematic for the ms-16j5 - available on Alisaler (free download). This board may be closer to your logic board.

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

On the MS16j2 schematic i found a power on sequence and found that these need to be present after start button pressed:
SUSPWROK - 3.5v
SUSPWRACK - 3.4V
AC_PRESENT should be high before DIMM_ON is enabled.
AC_PRESENT on my board is 0.4mV

[mon2]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Connect your power adapter.

Meter in DC volts (30v or higher scale).

Carefully measure the voltage to ground of each pin of PU2 charger IC.

Post the measurements and their pin number.

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Connect your power adapter.

Meter in DC volts (30v or higher scale).

Carefully measure the voltage to ground of each pin of PU2 charger IC.

Post the measurements and their pin number.

I also suspected the Charger chip and I remember that it has 0.3mV on the AC_OK line, but I make measurments and post them.

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

Connect your power adapter.

Meter in DC volts (30v or higher scale).

Carefully measure the voltage to ground of each pin of PU2 charger IC.

Post the measurements and their pin number.

BQ24737 With only AC plugged in NO BATTERY
pins:
1 - 19,9 v (ACN)
2 - 19,9 v (ACP)
3 - 0,5 mv (CMPOUT)
4 - 0,22 v (CMPIN)
5 - 10 mv (ACOK)
6 - 2,7 v (ACDET)
7 - 1 mv (IOUT)
8 - 3,3 v (SDA)
9 - 3,3 v (SCL)
10 - 1,14 v (ILIM)
11 - 3,3 v (BM#)
12 - 3,6 v (SRN)
13 - 3,65 v (SRP)
14 - 0 v (GND)
15 - 0 v (LODRV)
16 - 6,1 v (REGN)
17 - 6 v (BTST)
18 - 3,7 v (HIDRV)
19 - 3,7 v (PHASE)
20 - 19,6 v (VCC)

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

When only battery connected the ACOK signal goes 3.31V so It looks good!
What to check next?

[mon2]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

ACOK# is an active low signal so if this line is low = 0 volts, then the external adapter is OK. With only the battery, your reading is ok since the external adapter is missing.

Measure the voltage to ground of each coil (inductor) on the logic board.

Do you see the blue light on the board light up with the adapter & battery connected? Not sure what the blue light denotes but check the power rails (each inductor is a power rail).

Do you still have a known good board to compare against?

[questore]

Re: MSI GE62 6QF MS-16J41 not reacting to power button

ACOK# is an active low signal so if this line is low = 0 volts, then the external adapter is OK. With only the battery, your reading is ok since the external adapter is missing.

Measure the voltage to ground of each coil (inductor) on the logic board.

Do you see the blue light on the board light up with the adapter & battery connected? Not sure what the blue light denotes but check the power rails (each inductor is a power rail).

Do you still have a known good board to compare against?

Yes when AC & BATTERY are both connected, there is a blue Led lit up.
All coils are ok, lowest is CPU 3.2ohm

According to the ms-16j2 g3->s0 sequence, (I have linked it before) everything is good until SUSCLK and AC_PRESENT signal. Should I check 32khz?