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Hey guys working on this 820-3787, did some troubleshooting and came to the conclusion that i'm not getting 3v3 s0. No short to ground but after checking further i see that it comes from PM_SLP_S3_L, it is 0v not enabling u8180 to open. I have 3v3 s5 on pin 5 as always i get confused with this...

wow could be graphics issue

Duke asked for resistance to ground measurement in ohms. Not if you have a short to ground.

Check your smbus data lines with an oscilloscope. Your multimeter is to slow see if your data line is communicating with pulses.

You were right on the spot Duke, again no bad traces but i said screw it i replaced the U1900 clock chip and Y1905 got video and chime now mark as solved again !

Hey guys had this one for a while, has cpu vcore mouse lights up but there is no chime or display, ram removed there is no ram beep PPVCORE_S0_AXG_R is 0v replaced a bunch of components tried bios tried clock chip tried U7400 even a smc still no luck. Is this a dead cpu. Or i am missing...

Once again Duke right on the money replaced U7501 back to life mark as solved !

No water damage traces look fine

Hey guys working on this macbook air, and whats driving me crazy its doing the same exact shit a 820-3115 will do and i have not even yet figured out what causes that shit. So i plug it in fans spins mouse lights up but has no chime or no video display i am going to check some rails and report...

Charger light is present and solid Pbus Voltage steady 8.59 S5_PWRGD is pulsing hi 3.3v

Hey guys working on on this 820-3435 air no water damage, customer used the mac one morning and shut it down came back to use it and it would not turn on. iItried smc reset at first but noting happened, green light did not cycle from green to orange. Tried this twice with no luck that's when i...

Thank you simba your advice worked like a charm! Duke mark this one as solved, even tho your way is the right way but no time for the long painful task on a board with prone gpu issues waiting to die ! Thanks again guys !!!!

Did you inspect for corrosion under the lp8550 chip for water damage ?

Hi Guys this one is pulling my brains on this one. Customer came in stating that this unit has no audio which is very strange because on boot you hear it chime. But when you try and play a video there is no sound, if i plug in the headphones there is sound, but when i unplug the headphones the...

Mark as solved

Ok Duke mark this one as solved, you were right again current sense was the problem. Tho it it was not the resistor was at fault but the fucking test probe point on one of the traces for R7120 was completely missing ran a jumper and is now back to normal again thanks for the advice again you...

PP3V42 3.419V ACOK 3.268V PPBUS Resistance to GND OL

Hey guys working on this 15 in retina which looks like it was sodomized by another shop. I noticed that pbus voltage was 1.6v at charger phase at u7100, I checked my current sense resistors all seem good with normal readings 5v is at input pins of u7100 ac in is at normal 4v at pin 3 dc in is...

Thanks for the advice Duke! Mark this one as solved i was missing a rail just as you said. Turns out i was missing PP0V75_S0_DDRVTT which comes from U7300, that was missing MEMVTT_EN signal that comes from Q3250 pin 5. Turns out the MEMVTT_EN_L signal was high due to Q3200 not opening the source...

100% right Duke 0.050 v at ALL_SYS. I did a compare with a good working board at Q7950 i also replaced Q7950 and have the same result i'm a little confused because the readings are not too far off. Where should i look from here? 0.751 0.763 > 0.129 0.129 0.107...