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A1708 / EMC 2978 — Released October 2016, this entry-level MacBook Pro retains its traditional function keys (as opposed to the OLED Touch Bar). The function key version packs an Intel Core i5 and two Thunderbolt 3 ports.

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Logic board - Voltage on all rails EXCEP 5V - Maybe ISL95828HRTZ?

Took this computer apart, trying to fix it myself.

Computer will not show ANY signs of life on the outside.

USB-C with charger on it shows 20V but minimal (almost 0) amps.

I started probing the different voltage rails on the mother board.

PPBUS_G3H : 13.13V

PPBUS_G3G_CPU: 13.3V

PPDC_IN_G3H: 20V

PP3V3_G3H: 3.4V

however…

All the 5V related lines are 0 V all the way back to the PPV5V_S0.

PPV5V_S0: 0V

PPVCCPCH_S5G: 0V

PPVCCSA_S0G_R: 0V..

First time trying to fix my own MacBook logic board. Curious if anyone has suggestions to narrow down the issue.

it seems to me I may have a bad U7100 part (aka ISL95828HRTZ ) DCDC buck converter? Just my best guess.

Appreciate any suggestions!

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Review Louis Rossmann’s YouTube vids as he gets deep into fixing logic board issues! Louis Rossmann

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Thanks His videos are very helpful and I’ve watched a ton of them over the last week They are how I got to where I am now but didn’t get quite far enough!

Thanks but I’ll keep this question open for now

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