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where does PP5V_S4RS3 come from and what can i do to create it? i checked all 4 locations only thing i noticed out of place was r6117 was disconnected, from both sides. replaced and retraced, and i have 3.3v running threw it now, but still no change. sucky part is that it was working, once i ran...

yes i have 3.3v on l7560

sweet, that had worked. i had power, ran it threw ultrasonic, tested, still worked, put it in housing and it stopped working, took it out, tested still dead. i have 8.6v on c7500, 3.3v on c7503, 3.4v on r8140, 1.5v on r7506 instead of 3.3v, 0v on r7551. could the chip be bad? all my problems...

is there a way to fine the corroded trace? i have been over this board several times and have yet to find anything that looks corroded. anything that had ive already fixed

if they are right next to each other how can it be so low, that would mean something is pulling it down. dont caps short directly to ground so i would get 0v. im assuming c7500 is partly bad?

my bad i replaced it with a 100k replaced with right value, now im getting 3.4v on pin 21 of u7501. im getting 1v on c7500 but im getting 8.2v on C7541 and 0v on c7503

sorry my replys take a bit. ive been doing multiple devices, iphone screen replacements, ipad 5th gen screen, have to balance the board work with priority work

i may have put the wrong resistor there, the schematics say 100 but not 100 of what, do you know what the resistor is, ill have to pull one from another board

im getting 1.7v on pin 2 of r8140 but 3.4v on pin 1, i replaced that resistor from another board, is that voltage right? pin 2 on r8140 goes to s5_pwr_en. r8140 and r8141 were gone when i looked at the board, repaired a trace to r8141 and replaced both resistors.

8.59 PPBUS at f7700

yes i have orange light, .had orange light from start. with all the corrosion around smc i knew i had to reflow.

.63v on PP3V3_S5, tried to reflow smc but no change how is .63v possible on a 3v rail?

i get a amber light for power, board was water damaged, around smc, r5177 -5180 all burned /missing, replaced with good resistors , trace gone at r7516, r8141 was gone. i get 16.4v ppdcin_g3h i get 0v on pp5v_s4rs3. i noticed on alot of the enable lines im getting half a volt.

if i missed any rail, please let me know. several rails are doing nothing.

PP5V_S0 0v PP3V3_S0 pulse PP5V_S0_FET 0v PP3V3_S0_FET pulse PP3V3_S0SW_SSD_fet pulse PP3V3_S0SW_SSD pulse PP0V675_S0_DDRVTT 0v PP1V5_S0 pulse PP1V05_S0 0v PP1V05_S0SW_PCH_HSIO 0v PPVCC_S0_CPU 0v

pulse on pp5v_s0 pulsing on pp3v3_s0

no pulse on all_sys_pwrgd 0v steady

if your talking about PPVCC_S0_CPU im not getting a pulse its staying 0. unless i go all the way down on my voltmeter, 200m i get .1 pulse, pretty sure thats not actual voltage

12.5 g3h and pulseing on pp5vs4

no water damage, only history i got was, she was using it, it shut off on its own, she took it to a repair shop in california, and they told her the logic board was shot needed replaced. she lives in kansas so she wanted another opinion when she got back, and here it is on my desk. visually...