Need help with 820-00165

[goksi75]

Hi Guys!

820-00165 all work fine until i close the screen, when i open it its black screen but the keyboard light and CapsLock on, I have to turn it off and then on again and then it works normally. I noticed that when I press the ignition button, it takes 15-20 seconds. to display the apple logo.
The problem is wont wake up after sleep.
Sorry for bad English.

[reformatt]

Re: Need help with 820-00165

Check the trackpad and LIO flex cables for corrosion. SMC LID signal goes to both. If the trackpad cable is damaged, can also potentially cause full fan speed/CPU throttling.

[goksi75]

Re: Need help with 820-00165

I put another checked LIO flex cables, SMC LID is 3,4v, replaced trackpad cable, fan speed is normal. As I said, all work fine, problem is wont wake up after sleep when i open it its black screen.

[reformatt]

Re: Need help with 820-00165

The lid sensor is a hall effect switch in the LIO board, triggered off a magnet in the screen. Have you tried another LIO board, and if so, does SMC_LID toggle on lid open? What other troubleshooting have you done?

[goksi75]

Re: Need help with 820-00165

I put another LIO board, and behaves the same, SMC_LID is same 3.4v before and after closing the lid.

[mon2]

Re: Need help with 820-00165

Post the voltage readings for:

SMBUS_SMC_3_SCL

SMBUS_SMC_3_SDA

[goksi75]

Re: Need help with 820-00165

Smbus_smc_3_scl 3.3v

smbus_smc_3_sda 3.3v

[mon2]

Re: Need help with 820-00165

SMBUS lines are ok.

SMBUS_LID is not working correctly. You should see a different reading when closed than when it is open.

Suspecting the same as other comments, that the LIO board is not driving this pin so that the SMC @ U5000 can monitor this logic level change and then turn ON / OFF the backlight.

Can you remove the SSD and see if the logic board powers on every time and shows the display ? You should see the blinking folder graphic.

When you do NOT see the display working, can you use a flashlight (phone) to view the display graphics ? Try from the BACKSIDE of this LCD display - perhaps the fault is that your backlight is faulty.

[goksi75]

Re: Need help with 820-00165

Yes when i move ssd i see the blinking folder, and ever i turn the ssd and raise the OS everything is fine, but when I lower the cover it goes into sleep mode and when I raise the screen the keyboard lights up and the screen is black and when I turn on the light from the phone and put on backside of lcd, nothing is visible even the light from the phone.

[mon2]

Re: Need help with 820-00165

Try the phone light on the front face - do you see any of the usual graphics / flashing folder icon ?

[goksi75]

Re: Need help with 820-00165

Now a new situation happened to me that he went into sleep mode when I picked up the lcd he didn't even want to turn on.

[mon2]

Re: Need help with 820-00165

Do you see any fan spin ?

If not - remove all power. Remove the LCD. It is not required for this first level testing.

Without the LCD, apply the power adapter.

Do you see the magsafe LED on ? What color is the LED ?

Are you using the official magsafe adapter ?

[goksi75]

Re: Need help with 820-00165

Yes, I see magsafe led first green and then orange and fan is spin.
Yes, I using official magsafe 2 45W.

[mon2]

Re: Need help with 820-00165

Good.

Check the contacts on the LCD screen cable -> all clean & shiny ? Ok to use alcohol (IPA) to clean the contacts.

Attach the LCD again. Can you see the backlight after the fan spin ?

If not, measure the backlight voltage for the LCD.

See here for other details on this logic board:

https://repair.wiki/w/A1466_2015-201...9D_MacBook_Air

[goksi75]

Re: Need help with 820-00165

Checked contacts on the LCD screen and all is clean.
I connected lcd again and have this.
But the problem is still present after going into sleep mode it no longer turns on.

[mon2]

Re: Need help with 820-00165

Good - can see my selfie.

Remove all power. Remove the trackpad cable.

Power on again with the adapter.

See attached (stolen from beetstech website) - use tweezers to turn the logic board on/off across these pads.

Does the logic board power on and show the display every time you use the tweezers ? Repeat this testing a few times to confirm.

If not..

Remove all power. Meter in resistance mode. Confirm the resistance of R5171. Should be ~100k ohms.

[goksi75]

Re: Need help with 820-00165

I did as you said a couple of times and logic board is power on and show the display every time, R5171 is 100k.

[mon2]

Re: Need help with 820-00165

Good.

Remove all power.

Attach the trackpad cable again.

Apply power but use the same on / off PCB pads with tweezers.

Can you turn on the logic board everytime ? Do this multiple times to confirm.

[goksi75]

Re: Need help with 820-00165

Attach the trackpad cable and logic board is power on every time with tweezers.

[mon2]

Re: Need help with 820-00165

Good. I think your issue is with the keyboard on/off button.

Can you now test with the keyboard on/off button ?

Is this flaky and sometimes fails ?

The keyboard inside this unit is a membrane button - I recall this issue on this forum and we used resistors if I recall correctly to fix the fault.

Let me review while you test with the keyboard only (no tweezers).