[SOLVED] 820-2532 no PP5v_S0

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TCRScircuit

Super Moderator
Staff member
Hey guys, this one is really throwing me for a loop --

Came in with history of customer ultrasonically cleaning it, also with the note of "Magsafe sparked when plugged in"

Went through the rails --

All rails present except PP5v_S0

PP3v3_S0 is present.

U7500 and Q7511/10 had some residue and U7500 and a red probe point (PP5v_S0_MCPREG_VCC) . Replaced U7500 and Q7511. Still nothing.

Pp5V RT_S0_BOOT present

PP5v_RT_LGATE missing

PP5v_RT_PHASE missing

PP5v_RT_S0_UGATE missing

EN, VCC, and VIN present to U7500

This is not a C7771 issue as well.

If I supply 5v to 5v S0 vcore is present and drops to .99 indicating post.
 

TCRScircuit

Super Moderator
Staff member
P5v_RTS0_EN is present. Q7510 and 11 were both replaced at the same time as U7500. Don't see a issue with any of the traces around U7500 and I checked the signals from U7500 to the fets. All have continuity from the pins on the chip to the fets
 

dukefawks

Administrator
There is not much to this. It is either another bad ISL6236 or corroded trace, C7514 possibly. Take off the ISL and double check all traces for the 5V side of this circuit.
 
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