MacBook Air A1466 - No chime, no picture, fan spinning

[j.bisous]

Hello!
I just got and MacBook Air A1466 EMC 2925 (820-00165-A) but it doesn't chime with not light on keyboard and black screen, just the fan spinning.
I noticed something weird with the fan:
- When the charger is connected, he powers up on his own (one time fan spining for 5 seconds, stops, then solid normal fan spining until I force the shutdown).
- When I try to run the Mac on battery, he is just power cycling (fan spinning for 10-15 seconds and then stop before restarting again and so on).
I already tried to reflashed the BIOS: nothing changed.

Here are some measurements but I think everything is good here:

PPBUS_G3H = 8.6v
PP3V3_S5 = 3.359v
PP5V_S5 = 5.13v
PP3V3_SUS = 3.359v

PCH_INTRUDER_L = 3.361v
RTC_RESET_L = 3.353v
PCH_SRTCRST_L = 3.353v
PCH_INTVRMEN = 3.241v
PCH_DSWVRMEN = 3.241v
S5_PWRGD = 3.406v
PM_DSW_PWRGD = 3.442v
PM_BATLOW_L = 3.36v
PM_RSMRST_L = 3.308v
PM_PWRBTN_L = 1.017v
SMC_ONOFF_L = 3.423v

PP3V3_S4 = 3.356v
PP5V_S4RS3 = 5.14v
PP3V3_S3 = 3.36v
PP1V8_S3 = 1.108v
PP1V2_S3 = 1.213v
PP5V_S3_RTUSB_A_F = 5.14v

PP5V_S0 = 5.12v
PP3V3_S0 = 3.358v
PP1V05_S0 = 1v
PP1V5_S0 = 1.522v

P5VS4RS3_PGOOD = 3.357v
P1V8S3_PGOOD = 3.355v
DDRREG_PGOOD = 3.357v
P1V05S0_PGOOD = 3.356v
ALL_SYS_PWRGD = 3.355v

CPU_VCCST_PWRGD = 1.032v
CPU_VR_EN = 1.063v

PPVCC_S0_CPU = 1.82v
PP0V6_S0_DDRVTT = 0.610v

CPU_VR_READY = 1.061v
PM_S0_PGOOD = 3.442v
PM_PCH_PWROK = 3.443v
CPU_VIDALERT_L = 1.061v
CPU_VIDSCLK = 1.061v
CPU_VIDSOUT = 1.061v

SMC_DELAYED_PWRGD = 3.439v
PM_PCH_SYS_PWROK = 3.442v
LPC_PWRDWN_L = 3.36v
PLT_RESET_L = 3.36v
PLT_RST_BUF_L = 3.36v

EDP_PANEL_PWR = 0v

SMC_LSOC_RST_L = 8.6v
SMC_MANUAL_RST_L = 2.682v
SMC_RESET_L = 3.4v
PM_SYSRST_L = 3.308v
CHGR_RST_L = 3.402v

SMC_CPU_VSENSE = 1.818v
SMC_P1V05S0_VSENSE = 1.066v
PP1V05_SUS = 1.073v

I don't have any ideas on what to check next...
Any ideas?

Ps: Sorry for bad English

 

[chscag]

Your MacBook Air is a 13" Early 2015 model originally preinstalled with OS X 10.10 or 10.11.

It's hard to tell from the symptoms you gave, but it appears that perhaps the logic board is defective. The power supply and logic that controls it is on the logic board. (mother board)

Macs do not have a BIOS so we have no idea what you mean by "reflashed the BIOS"?

And, welcome to our forums.

 

[techiesteve]

As above, plus whenever I see your symptoms the logic board has failed. The measurements you gave are meaningless, as Apple's approach to servicing is modular exchange, no component level repair.

 

[j.bisous]

There is an EFI IOS chip on macbook air (a winbond on mine). I have read that this program could be corrupted but in my case it doesn't. I checked each measurment with the board diagramm and everything was fine. I could have some shorted capacitor but nothing.