Dell G15 5511 LA-K452P won't turn on

[javieromex]

Hello, any help will be apprecited!

• Model: Dell G15 5511
• MB: LA-K452P
• Issue: Won't turn on at all, no leds, no keyboard light, no fan spin, nothing happens when pressing power button. NOTHING.
• Customer reported it was turned off and left plugged in during the night and thats it...
• No signs of liquid damage or burned components.

Link to Schematics -> https://www.badcaps.net/forum/troubl...la-k452p-gdp50

I have checked so far:

-Voltage Coils
Measured all coils in diode mode and all off them seem ok (per reference from several other boards).

-Voltages S4/S5 (Schematics P3).

• +RTC_CELL: 3V
• +5VALW: 5V
• +3VALW: 3.3V
• +3VALW_PCH: 3.3V
• +3VALW_DSW: 3.3V
• +1.8V_PRIM: 1.79V
• +1.05VO_OUT_FET: 1.04V

Power Sequence: (Schematics P5)

• +3VL_RTC: Present
• PCH_RTCRST#: Present
• +19VB: Present
• +3VLP/5VLP: Present
• EC_ON: NOT found. No present on MEC or with a different name?
• +5VALW/+3VALW/+3VALw_DSW: All present
• PM_BATLOW#: Present
• +1.8VALW: Present
• +1.05VALW: Present
• +1.05V_PCH_PRIM: Present
• +SUSACK#: Present
• +On/OFF: Working ok (tested on button and on MEC).
• +PBTN_OUT#: NOT PRESENT (Neve appeards, checked with oscilloscope)

Additional:

• AC_Present: Present
• 32K Oscillator: Working
• 38M Oscillator: Not on (If I am not wrong this turns on when power on).
• Tried 2 Bios and same (I do see data transfer when pluggin the charger).
• Tested with 2 know good 240W adapter.

I am suspecting this is a MEC1515-NB issue, but please let me know what you think. Any advice on will be appreaciated!
(I know those MEC1515 are a pain...)


Gracias!!

[mcplslg123]

Since 5VALW/3VALW is presemt,EC_ON has to be there-so not an issue.

What about ECRST# and RSMRST#?

[javieromex]

PCH_RSMRST#: 3.3V

Couldnt find ECRST# or equivalent, any advice?

[mcplslg123]

ESPI_RESET# present?
Resistance to GNd on pin8-9/13-14 of UG3?
EC_PCH_SPI_EN present?(very likely yes)
HW_ACAV_IN present?
DSW_PWROK present?
PCH_RSMTST#_AND Present?

There is an AND gate used in almost every logic on this mb,so you need to check each and evry AND gate status.

[javieromex]

• ESPI_RESET#: 1.8V
  Resistance to GNd of UG3?
• UG3 Pin8: 0.96kOhms (336mV Diode mode)
• UG3 Pin13: 0.76kOhms (219mV Diode Mode)
• EC_PCH_SPI_EN: 3.4V
• HW_ACAV_IN: 3.3V
• DSW_PWROK: 3.4V
• PCH_RSMRST#_AND: 3.4V

"There is an AND gate used in almost every logic on this mb,so you need to check each and evry AND gate status." Can you point me what page you are refering to?