Recent content by Outofwhack

SOC rom erase and DFU revive did result in screen coming up and showing 80% completed bar but configurator said "The system cannot be restored on this device" AMRestoreErrorDomain -1 sys 0x3F sub 0xFFF code 0x3FFF I tried a new trackpad, no change. Logic board now comes in configurator as...

Could you name some that do. I'm lucky to get 1 in 20 revives working over wifi

So should a UGREEN adapter have worked in Internet Recovery? As I mentioned it didn't on a working A1706 - does it need to be an Apple Thunderbolt to Ethernet adapter?

There is no network connection and Im not seeing any flashing lights on my new UGREEN ethernet adapter when booting into internet recovery (Option Command R) on this faulty A2179. It works fine (lights on adapter flash and it connects to the network) on a working A1706 when fully booted and on...

Command R now allows attempt to load recovery software from Apple. Does not attempt from local disk for some reason. However only 5th attempt completed without 2005F error but then said could not find host and went back to beginning. Does appearance of apple logo signify NAND being read?

Yes, trying revive. Would not complete. Tried restore. Would not complete. Timeout waiting on DFU state. Now get logo when starting holding Command R. Logo 30seconds followed by 15second black screen, repeat. Capslock toggle working.

No liquid history, no corrosion visible Backlight comes on but no logo CPU gets hot Tried known good screen SSD0 Voltage rails 2.5v, .8v, 0.9v all present. No toggle of caps lock light No external video No USB activity DM on pins J8500 1,3 .36v, .36v

I replaced a second speaker amp at the other end that also appearing warm and I think its now solved.

I delayed sending this one back to the customer too quickly as I wanted to leave it on the shelf for a few days and make sure it will take a charge. Again it has drained the battery to 0% and won't start charging. Cmizapper battery tool reports TCA and DSG. I tried a new battery too - same...

As a long shot I tried my thermal camera and with only 20mA draw the hottest chip was an audio amp at 30c supplied by 3v8_aon. I lifted it and found corrosion under the chip! Problem solved. Thx for your help.

I tried that. After turning off pp2v5_nand0 the other [20v capable] non-working board still got to 20v. So I suspect this would indicate that reading a NAND partition is not required before going to 20v. Can any other area explain pp3v8_aon oscillating 2.5v to 3.4 avg 3.2v?

Does it need access to the NAND before getting to 20v? This board does not get to 20v.

I do happen to have another non-working board - measurements from this in brackets at end of line pp5v_s2. 0.3v close to OBdata 0.39v pp1v2_s2 0.2v close to OBdata 0.26v pp1v8_s2 0.22v close to OBdata 0.255v pp1v8_aon 0.4v close to OBdata 0.44...

U5700 8 - PPVIN_P3V8AON - 12.3V 7 - PP5V_AON_P3V8AON - 5V 5 - P3V8AON_PVVC - 5V 12 - P3V8AON_PWR_EN_R - 4.5V

Lady's a2485 just stopped. No visible liquid damage to board 5volts 20mA not connected to battery, trackpad ppbus_aon 12.3v pp3v8_aon oscillating 2.5v to 3.4 avg 3.2v (low) I noticed U5700 has an erratic input voltage pp5v_s2_main 0.6v to 5v p5vs2tps_pwr_en 0.2v but Im going around in circles...