820-3476 - Orange LED, but no power

Palhano

Member
Hello, I have a clean plate with no oxidation. Green Magsafe LED, then orange. But it doesn't. Some measurements.

PPBUS_G3H 12,5v
PP3V42_G3H. 3.4v
PP3v42_G3H 3.4v
PM_RSMRST_L 3v
SMC_ONOFF_L 3,37v
PP3V3_S5 3.3V
PP3V3_SUS 3.3V
PP5V_S5 5v
PM_BATLOW_L 3.3V
SMC_ADAPTER_EN 3.3V
PM_PWRBTN_L 3.4V
PM_RSMRST_L 3V
SMC_PM_G2_EN. - 3.4V
RTC_RESET_L. - 3.26V
PPVRTC_G3H - 3,3V
PCH_SRTCRST_L 3.26V
ALL_SYS_PWRGD 0V
 

Palhano

Member
On the U1950, pin 3 has no pulse, on 7 it has a 0.15 pulse.

The board turned on twice when I was checking the coils. The ones next to the CPU (L7320, L7310, pulse 0.24v).
 

Palhano

Member
When I activate the SMC_ONOFF several times, sometimes it turns on and it works. But if it turns off, it doesn't come back.

Before, testing pin 3, it had no pulse. But the board never turned on either.

I now have a pulse on pins 3 and 5.
 

2informaticos

Administrator
Staff member
Try with another original 60/85W Magsafe 2 charger.
Also try with known good battery connected.

Test if turns on in SMC bypass, or safe mode.
 

Palhano

Member
nothing.

No longer works on SMC_ONOFF. I tried it a few times and it didn't work.

Customer has urgency. I'll return it. Thank you so much for your help ever!
 
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