A1466 - 820-00165 - Not turning on - Magsafe green amber

[samstown]

Hello,

A1466, connected USB Tester A4551 then plug magsafe. power led flash once, then power led and 5 volt flash, then all off, 3 seconds later, same sequence, then nothing.

Customer asked if it could be related to power supply as they recently ordered a new one from Aliexpress. it works for a week and then MacBook stop working. I've tried SMC reset on the board, didn't help.


PCH_INTRUDER_L = 3.02V
PCH_INTVRMEN =3.23V
RTC_RESET = 3.32 V
At power PLT_RESET = 0 then 3 for a fraction then 0 then 1.21 then 0


PM_BATLOW_L = 3.33v
PM_DSW_PWRGD, 3,42v
PCH_DSWVRMEN, 3.22V
PM_RSMRST_L, 3.30V
SMC_ADAPTER_EN 3.42V


P3V3SUS_EN =3.34 V
PPBUS_G3H = 8.64 V
R7111 pIN 1 = 4.35
R7111 PIN2 =16.5 V
ISNS_P3V3S5_IOUT = 0V
P3V3S5_EN_R = 3.42V
U7090 PIN 1 P3V43G3H_FB = 1.26V
U7999 PIN 2 = 3.42V
P3V42G3H_BOOST 7.29V

 

[2informaticos]

Try first if turns on in SMC bypass mode.

Seems that you are in the worst scenario of this board, pulsing twice.

820-00165 Pulsing - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki

 

[samstown]

no luck with SMC bybass. Thanks for the logi.wiki link, I don't get the fan spining at all but it looks very similar. Probably time to stop on this board.

 

[2informaticos]

Few times I recovered after heating PCH area with quality flux.