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I actually have 3 of these machine. Early 2013 15" Retinas with the same issue. On #2 though, when screen goes black, The GPU VCORE goes to 0V so I am assuming U8900 may have broken solders.

I used HWMonitor and it says the SSD has 63% service life left, though I am not sure if that is helpful.

I have on the bench an 820-3332, so it is an Early 2013 15". the first time I saw it on my bench the screen would randomly flicker and the laptop would crash. I resoldered U8900 and it seemed to fix it, but a week later it is back on my bench. According to the customer, after it is running for...

Just to reiterate: PP3V3_SUS is currently at 1.1V. This signal is created by U8200 via pin 3. U8200 is supplied by PP3V3_S5 on pin 2 which is supplied from U7650, which it has 3.3V. U8200 is told to turn on by the power rail PM_SLP_SUS_L which comes from pin 238 of U1100, which by no...

Yeah, I think so. DO you know of anyone that has reballed one of these boards by hand? I do not have a BGA reball machine. I do have the stencil for this chip though.

Ok, did that and no change. I can see crap under U1100 which I assume is the PCH.

Ah ok. Well I figured Celsius, so I tried it and no change.

Is that Fahrenheit or Celsius?

pp3v3_sus is now 400 ohms

This is where I am at now: PPBUS_G3H: 12.6V PPBUS_HS_CPU: 12.6V PPBUS_HS_GPU: 12.6V PPBUS_HS_OTH5V: 12.6V PPBUS_HS_OTH3V3 : 12.6V PPBUS_S4_HS_TPAD: 12.6V PP3V3_G3H: 3.4V PP3V0_G3H: 3V PPVCC_S0_CPU: 0V PPVCCSA_S0_CPU: 0V PPVCCGT_S0_CPU: 0V PPVCCIO_S0_CPU: 0V PP1V2_S3: 0V PP1V2_S3_CPUDDR: 0V...

great now PP3V3_SUS is 1V. This board is confusing the heck outta me

Fixed two corroded resistors above U1100 and now have PP3V0_G3H. PP3V3_SUS is .219V now and I am getting 3 ohms...

So I have an 820-00281 that is at 20V. 30mA and has all the G3H rails up to PP3V0_G3H, which is at .01V and appears to have a 1.0 Ohm short to GND. Sadly thee liquid that I found was to the right of U1100. After looking at this rail rail. I see there only a few components and then U1100 and...

I'm looking at this board again. I found R 7062 is 263 Ohms. I replaced it and board went to 20 @ .02 amps

Is that where I need to use another Macbook?

I have PP3V3_S5, Steady. No history, the owner said it just stopped working. No liquid, no dorps damage. I am trying to see if they tried to update OS.

Hi, so on the bench I have an 820-01598 that is not powering on. I have 20V @ 40mA on my USB-C ammeter and PPBUS_G3H is 12.62V and PP3V3_G3H is present at 3.3V. I know since i have 20V at the charger the USB-C controllers are ok, and I have my G3H rails, I don't think my ISL is bad that probably...

I did. It is fixed. There was a broken via right above Q7810 (3V3S5_VFB_R7270). Ran a wire from R7270 into a via to L7220 and now have a working machine. Holy smokes this was a tough board. But it is back in the chassis and running Sierra like a champ.

So I found something out, When I put my red multimeter probe on Pin 9 of U6990 and hook up charger, I get a pulse of PP3V42_G3H rail. SO that tells me the chip is trying to put 3.42V out but something is stopping it.

U6990: 1: 1.2V 2: 3.8V 3: 16.65V 4: 18.3V 5: 0V 6: 0V 7: 1. 8.3V 8: 3.8V 9: 0v 10: 0v L6995: (Diode) Pin 1: .353 Pin 2: .352