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Do you have 20v on charger? Voltage on PPBUS?

Yes, still quarter fan spin. All big coils except L7550 are pulsing. ALL_SYS_PWRGD is 0v, in SMC bypass mode fan spins once and stops, then again.

That's right, I just wasn't waiting enough long to let caps discharge.. Yes, they both are stable 3,3v. Some other readings: SMC_RESET_L - 3,3v, PLT_RESET_L - 0v, AP_RESET_L - 0v, PM_SLP_S3_L - 0v Diode mode readings on big coils: L9701 - 0,385v L7260 - 0,366v L3895 - 0,475v L7220 - 0,400v...

Everything done and checked triple before connecting charger. Board has green/orange light, clicking every half second with quarter fan spin. With charger only PPBUS is 8,37v, with battery 7,99v, with both is jumping 8,17v-8,56v. Current sense is OK, U7000 pins 27/28 have 20,5ohm, 17/18 have 2,5...

Yes, you are completely correct, I don't argue with that. I just post here what is happening on this board. I put perfectly measuring 330K resistor, triple check it before plugging charger in. After I plug it in nothing happens. I disconnect charger, check that resistor and it's OL.... I've done...

I'm more than sure that it has correct value, I'm replacing it already third time and checking before and after soldering... I have just put new one there, it measured 330K. I plugged charger and board doesn't react, just clicking. I measure R7086 - blown, shows OL...

I've applied direct voltage with power supply then With battery only connected PPBUS is 7,98v, battery + charger jumps 7,5v-8,59v. I've replaced R7086 and it blew up again (Q7080, Q7085 replaced too)

No reaction on battery..

After reflowing SMC and replacing ISL + resistos there was no change, board wasnt turning on, just clicking. PPBUS ~8,4v. It turned out, that L3895 is clicking, voltage on it was jumping between 0 and 2v. While I was measuring the board it suddenly started... I replugged the charger and again is...

I've plugged charger in and resistors blew again.. Resistance between pins 27/28 was 1,6kohm, PPBUS ~4,5v. Replaced all set again, first I got 8,3v on PPBUS and board was cycling (one of the coils clicked every half a second, couldn't recognise which coil exactly.), after repluging charger PPBUS...

Not yet, after I replaced ISL and resistors with new ones I had to leave my office. I’ll power it up on Monday and report. Something tells me, that they will blow again... Thank you for your support, I really appreciate it. I wish you good weekend, will get back to this on Monday ?

I put new resistors and ISL, now readings are: Pin 27 - 0,563v Pin 28 - 0,567v

Pin 17 - 0,136v Pin 18 - 0,137v Pin 27 - 0,619v Pin 28 - 0,579v L7030 - 0,136v I guess problem is here? R7020 and R7050 not shorted. EDIT: I've removed F7040 and applied 8,56v on pin 2, board is powering on, fan is spinning, CPU gets warm.

Hi, stubborn board again. So I got it with not turning on problem. No liquid damage, but had replaced backlight IC before, the rest looks good. There is green and orange light on MagSafe, but fan doesn’t spin, just try to start and stops (Quarter fan spin). PPBUS_G3H ~4v, not shorted. I‘ve...

@2informaticos , I’m wondering if SMC from 820-3476 will be compatible with 820-3536?

I’m guessing it behaves like this because of no battery. I had similar cases. Connect good battery and check again.

Now everything is up to customer, if he will decide to repair the board, I will proceed. Sadly many people decide to buy new crap Macs instead of investing in fairly good models..

Hi, I'm working on 820-3787 which has problem with disorted image on internal screen. First, when customer came in image was OK. The only problem was that it wasn't passing login screen or was turning off while loading system. I thought it's typical VCORE problem. After one day laying on shelf...

I'm considering buying it for some time already, but honestly even my actual programmer isn't in use most of the time, maybe 1-2 times in a month. But of course medusa saves time, possible mistake risk and unnecessary board heating cycle. Anyway your suggestion made it jump higher in my...

Sure, I will keep you updated. Thank you for support! I have one more question. I was curious if EFI hasn’t got corrupted and after putting dump in ME Analyser I got such message (picture in attachment). I’ve never got such message. Is it normal for newer EFI, or should I clean ME region/take...