DAG37AMB8D0 very interesting problem

[simabilisim]

DAG37AMB8D0 rev: D
notebook does not start
There is no 3.3v on the 8th pin of the bios, when I disassembled the bios integrated there was 3.3v. I wrote to another bios integrated, when I plug again, there is no voltage on the 8th leg. I deleted the software in the bios, reconnected it to the motherboard, there is 3.3v when there is no software.

[Sametbey]

Re: DAG37AMB8D0 very interesting problem

can you post your scheme. some notebooks have dual bios. EC and MAIN. main biosa can be active after start.

[simabilisim]

Re: DAG37AMB8D0 very interesting problem

can you post your scheme. some notebooks have dual bios. EC and MAIN. main biosa can be active after start.

here you are

bye the way, ec and main bios writed

MOD Edit - link to schematic https://www.badcaps.net/forum/showthread.php?t=123395
.

[Sametbey]

Re: DAG37AMB8D0 very interesting problem

Let's start over. Are the DC_IN entry mosfets intact? Does the charge control chip send 3v to the 97 pin of the IO chip? Are there ENBL and PWGD signals on Pu2001 pins 1 and 2?

[simabilisim]

Re: DAG37AMB8D0 very interesting problem

DC_IN mosfets OK
IO chip 97 at 3v OK
PU2001 EN and PWGD no signal
Interestingly at PU2002 no signal EN and PWGD but 5v LDO OK

[simabilisim]

Re: DAG37AMB8D0 very interesting problem

PU2001 EN signal is OK when I remove the bios IC

S5_ON signal is output on IO chip pin 100 when I remove the bios

but PU2001 PWGD no signal

[Sametbey]

Re: DAG37AMB8D0 very interesting problem

In the scheme, when 3VLDO goes to IO, the power LED and EC_ON signal come to PU2001 with familiar information (AC_OK signal) from bios. ALW voltages are output. follow to steps
When S5_ON signal is output, does 3VALW come out from PU2001, 5VALW?

[arber1232]

Re: DAG37AMB8D0 very interesting problem

hi everyone i have same problem laptop not start .Ac led is on . in power buton 3.3v is ok
Pu2001 EN and PWGD no signal
Pu2002 EN and PWGD no signal

Pu2001 Ldo is 3.3v
Pu2002 ldo is 5v
Can i help me ??
In R5131 on side is 3.3 v pcu and one side is 0 v to s5_on ? is ok the resistor is 10k and i measure is 9.9k

[mon2]

Re: DAG37AMB8D0 very interesting problem

is ok the resistor is 10k and i measure is 9.9k

Yes, it is ok.

Remove all power (no battery / no adapter).

Meter in resistance mode (2k scale) - check the resistance to ground of each large coil (probably grey in color; red meter lead) to ground (black meter lead).

Checking for low resistance to ground which may be due to a shorted capacitor.

Do you have the schematic for this logic board ? If yes, post it for reference.

I did find the boardview file (only) for the same.

[arber1232]

Re: DAG37AMB8D0 very interesting problem

Yes, it is ok.

Remove all power (no battery / no adapter).

Meter in resistance mode (2k scale) - check the resistance to ground of each large coil (probably grey in color; red meter lead) to ground (black meter lead).

Checking for low resistance to ground which may be due to a shorted capacitor.

Do you have the schematic for this logic board ? If yes, post it for reference.

I did find the boardview file (only) for the same.

https://www.alisaler.com/hp-omen-17-...37a-schematic/ this is shcematic. I measuret coil motherboard is not shorts

[arber1232]

Re: DAG37AMB8D0 very interesting problem

File boardwiev in this post work its ok open with openboard

[lapfix]

Re: DAG37AMB8D0 very interesting problem

PQ1002 is p-channel what's the volt at his gate !
Pu 1001 voltages at pin : 5/6/16

[palady]

By the way TIP OF THE DAY

CHECK THE POWER SUPPLY FIRST

check adapter type, AD_ID

1.8V ..... DIS
1.26V .... UMA

I WAS FIXING THE BOARD FOR ABOUT TWO HOURS, THEN I REALIZED, I HAD A WRONG POWER SUPPLY

[ronaldopdias]

Hi! Here's a clearer and more technically accurate version of your message:

---

Hi everyone,

I'm having trouble with this laptop and could use some help, please.

• The charger shows a white light and orange when the battery is connected.
• When I press the power button, the white light on the charger blinks.
• I get the same reaction when testing the board standalone and triggering the power pads directly.
• I've flashed the BIOS firmware, but the issue persists.
• I haven't been able to flash the EC firmware, as I don't have access to a programmer.

+VIM = 19v
ACIN - 3V
LDO +3VPCU = 3.3V
LDO +5VPCU = 5.23V
VCCRTC +3V_RT = 3.16V
RTC_RS = 3.15V
SRTC_RST = 3.15V
RTC Clock 32.768KHz = 0.48V
+5ALW and +3ALV missing.
PWG missing.

On the resistor R5131 side +3VPCU it gets 3.3V, but on the other side S5_ON is 0V.

Everything else is missing.
No voltage on BIOS.
Using the original Charger.
No short on the coils.

Any help would be appreciated.

Thanks

[mcplslg123]

ECRST#/RSMRST# present?

AFAIK, only 5V should be present in standby and 3V will rise only after pressing power button.

[ronaldopdias]

RSMRST - 0V
EC_RTC_RST - 0V
No short.

[mon2]

RSMRST# - 0V
EC_RTC_RST# - 0V

Being active low signals (denoted by the # suffix), these lines are being parked into the RESET state.

[ronaldopdias]

Do you think that EC firmware is corrupted?

[mcplslg123]

EC_RST# and EC_RTC_RST# is not same.

[ronaldopdias]

Sorry for being silly, is that line known by any other name?