820-3115 - just turn on by pressing power

[Palhano]

Logic board with a lot of oxidation! No backlight on screen, fan turns and stops. If you press power for a few seconds, it turns on.

I changed components with oxidation, checked trails and reballing in the SMC. Checked the SPI resistors. The problem continues.

 

[2informaticos]

How many seconds?
Fan started with full speed?
If yes, then board turned on in SMC bypass.

 

[Palhano]

hold about 5 seconds. If I just squeeze and release, the fan turns and stops, it doesn't turn on.

Fan normal speed is not fast.

 

[2informaticos]

I still think about SMC sensors issue.
Run corresponding EFI ASD test, or post a screenshot of HWMonitor.

 

[Palhano]

I was only able to run EFI after changing the BIOS chip.

has several sensor errors. =/

- Sensor - Current (1C0R) -- (PU High (Core/AXG/DDR3/I0/SA) (test 1)
- Sensor - Current (IDOR) -- DC In (test 1)
- Sensor - Current (IHDC) -- Hard Drive (test 1)
- Sensor - Current (IMOC) -- DDR3 (test 1)
- Sensor - Current (100R) -- Other <5V, 3.3V» (test 1)
- Sensor - Current (IPBR) -- Charger BMON (Prod) current (test 1)
- Sensor - Voltage (VCOC) -- (PUV Core (test 1)
- Sensor - Voltage (VNOC) -- AXG VCore (test 1)
- Sensor - Voltage (VPOR) -- PBus (test 1)

I changed the SMC, but it didn't change!

 

[2informaticos]

Is AVREF_SMC present?

 

[Palhano]

discover a short in the AVREF_SMC line. Board working.

Backlight was a problem on the Q9706!

Now it's time to test everything! Thank you very much!