a1466 820-00165 no power

[lordgeny]

a1466 820-00165 no power

I have green light become orange in a sec .
Voltage reading :
PM_slp_s4 0v
PPVRTC_g3H 3.3
PPBUS_g3h 8.6
ppbus_s5_hs_computing_isns 8.5
PP3v42_g3H 3.4
PP5v_s5 5v
PP3v3_s5 3.3
PP3v3_SUS 0v
P3V3SUS_EN 0v
PP1V05_sus 0v
RTC_RESET_L 3,3
PCH_SRTCRSTL 3.3
PM_DSW_PWRGD (DPWROK) 0v
PM_BAT_LOW 3.3
PM_RSMSRT_L 0v
PM_PWR_BTN_L
PM_SLP_SUS_L 0v
S5_PWRGD 3.3
PCH_DSWVRMEN 3.2
PM_DSW_PWRGD 0v
SMC_ADAPTER_EN 3.3

PCH_INTRUDER_L = 3.2

[piernov]

Re: a1466 820-00165 no power

.

[mon2]

Re: a1466 820-00165 no power

Review this:

https://www.it-tech.com.au/mac-q-a/p...2ZQcVlaYV9LUGc.

[lordgeny]

Re: a1466 820-00165 no power

What could it be ? r8141 measures 100k

[mon2]

Re: a1466 820-00165 no power

check the voltage on each side of r8141.

Do you see +3v42 on r8141, pin # 1 ? This is an open-drain output and the r8141 pull-up resistor is required to pull up this line to a '1' state.

[lordgeny]

Re: a1466 820-00165 no power

pin 1 3.40
pin 2 3.36

[reformatt]

Re: a1466 820-00165 no power

Check board thoroughly for corrosion and each sub-rail for shorts/low impedance (especially PCH). Also check PM_SLP_S4 state when initially connecting magsafe (no battery). If you don't get any activity, then review the PM_SLP_S4 pre-requisites. If you get a pulse (once or twice) problem is elsewhere.

[lordgeny]

Re: a1466 820-00165 no power

the multimeter goes from 0.25mv to 50mv as soon as I connect the power supply

[mon2]

Re: a1466 820-00165 no power

What is the voltage of PPDCIN_G3H after you connect the original power supply ?

Also measure and post the readings of:

PPVIN_G3H_P3V42G3H

PP3V42_G3H

F7140, pin #1

F7140, pin # 2

[lordgeny]

Re: a1466 820-00165 no power

PPVIN_G3H_ 16.8 0.680

P3V42G3H 3.40 0.280


F7140, pin #1 8.60 0.140

F7140, pin # 2 8.60 0.140

[lordgeny]

Re: a1466 820-00165 no power

PP5V_S4RS3 not present

[mon2]

Re: a1466 820-00165 no power

Review this thread:

https://boards.rossmanngroup.com/thr...v_s4rs3.59197/

[lordgeny]

Re: a1466 820-00165 no power

P5VS4RS3_EN not present
P3V3SUS_EN not present

[mon2]

Re: a1466 820-00165 no power

Post the voltage readings for:

S4_PWR_EN

PM_SLP_S4_L

[lordgeny]

Re: a1466 820-00165 no power

0v both

[mon2]

Re: a1466 820-00165 no power

Post the voltage readings of R1460, pin # 1 and also of pin # 2.

Then remove all power -> meter in resistance mode (100k or higher scale).

Measure the resistance across R1460.

[piernov]

Re: a1466 820-00165 no power

No point in checking random things, must fix things in order of the power sequence…

[reformatt]

Re: a1466 820-00165 no power

Piernov is 100% correct. The power sequence is available here:

https://logi.wiki/index.php/G3_to_S3..._and_Broadwell

From the first post:

S5_PWRGD=3.3 yet PM_DSW_PWRGD=0V

Piernov alludes to this in his first post, however I guess this wasn't clear to the OP. You won't get to S4 beyond this signal, so troubleshooting beyond PM_SLP_SUS_L is a waste of time.

PM_DSW_PWRGD comes from the SMC, so you need to be troubleshooting why this is low. Check all supplies around the SMC (PP3V3_S5_SMC_VDDA, PP3V3_S5_AVREF_SMC etc), also check for signs off liquid damage in this area. Sometimes you get crap under the SMC causing weird issues, so I remove the edge bonding and reflow it with flux. Could also be a crook SMC of course too.