ASUS ROG GL552VW REV 2.0 Unable to power ON

[Bonaventure Vigil]

Hi All,

• I bought faulty ROG recently from my friend hope that I can fix it by myself since it more thrill to repair it. Model ASUS ROG GL552VW REV 2.0. Refer picture below. I fix few faulty laptop some of that success because of faulty caps. But for this ROG, I'm stuck. From power sequence, 19V, 3V5V is present.
• The power present is from No 1 until 17 (PM_RSMRST#) during power button is being push. But at No 18 (PM_SUSC#, no signal SLP_S4# coming from PCH. And no signal so on.
  Signal available mostly 3.3V

1. +3VA
2. PS_ON
3. +3VA_EC
4. EC_RST#
5. 3VADSW_ON
6. 3VA_DSW_PWRGD
7. DPWROK_EC
8. PM_SLP_SUS#
9. VSUS_ON
10. 5VSUS_ON
11. 3VSUS_PWRGD
12. PM_RSMRST#
13. SUSWARN#
14. ME_AC_PRESENT
15. PM_SUSACK#
16. PWR_SW#
17. PM_PWRBTN#

• I've check for short and trace the line, it's ok. Diode mode 0.5. I just change the BIOS which is from this forum too, also no sign of life.
• Power Supply showing 20V, 0.012A, during power on is only 0.016A. Use thermal camera only the LAN IC is a bit hot 30DegC. All coil reading seem ok. Appreciate your Pro's help me here. I feel really stuck.😥

[pc_okay]

Hello,

Is the battery charging?
If not, it might be the 32.7khz Crystal.
You need a signal analyser or an oscilloscope to Check it.

[Bonaventure Vigil]

pc_okay,
Yes battery able to charge with 16V. Refer pictures
What I've done so far, took out the LAN ic, still no sign. PSU show 0.000A. Trace all the line, no short for PM_SUSC# and SLP_S4#. Reflow the PCH HM170, still the same. Advice Any other things need me to check. My oscilloscope still otw from China😥

[mcplslg123]

+12V present?

[Bonaventure Vigil]

@mcplslg123 mean voltage from battery? from the coil show 16V

[mcplslg123]

No. I mean +12V rail working?

Have u checked powergood signals?

[Bonaventure Vigil]

For +12V signal is not available since it coming from power No (20) SUSC_EC#, and before SUSC_EC# is (19) PM_SUSB# and PM_SUSC# which is i'm stuck now. The +12V rail is ok no short. 3VSUS_PWRGD and +5VSUS_PWRGD is available.