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This 2012 15'' 820-3330 was brain dead with all rails, not booting, no usb mouse activity. I read the bios with the medusa and had an "Error read blockxxxx not found..." (apologies didn't write exactly the error)... Tried a random testing 820-3330 bios and it worked and booted correctly. I...

Hello 2informaticos, Sweep function is embedded by default in my ultrasonic cleaners. I have no way to use them without sweep function. I think I have a good idea about cavities, transducers, dead or hot spots and standing waves. This board didn't have the acid very agressive damage that we...

After an ultrasonic I don’t have anymore 20V, I have 5V 0.16-0.20A and loops on both ports usb-c meter. I still get 12.25V on PPBUS_G3H, 3.3V on PP3V_G3H and 5V on L7030. No more PP5V_G3S... It doesn’t enter DFU mode anymore. Checked around both usbc mux chip and didn’t find any short on...

Areas affected by liquid: ISL9240 had some greeny crap corrosion, U3710 WLAN serial EEPROM, J6410 (speaker). I have just discovered 2 test points TP5905/06 completely gone ISNS_HS_OTHER3V3_P (and /N) but it seems there is no U5440 on this board... I will look again carefully and do an...

Yes exactly, that's what I noticed on machines where a dfu restore solved the problem. And yes this T2 machine remains in off state once dfu is completed, I don't see the apple Logo that bring you to the question mark or any process to install a fresh OS... I am not sure if it's normal on this...

Yes for sure! here is the link for "820-01236 A2115 2019 27in iMac bios" I just replaced the FSYS block the same way I downloaded. Hopefully it will be soon fully supported with medusa. https://drive.google.com/file/d/1klAL4UZMyOmIX-WVHAe1B9W6RGSk2OK3/view?usp=sharing

Yes it seems I completed the dfu, both revive/restore I had no error but nothing happened on device under dfu. As for recovery, I don’t see how I could start it, I have no chime, I don’t see anything on internal lcd or external monitor, No capslock or usb mouse light, same with usb keyboard.

I tried your Bios and it didn't start. Tried another one and had the same issue described (no Sata hdd detected). Finally I decided to max out the original 32 GB ssd bye replacing it with another one. While doing that I just found 2 drives: the hdd and the new ssd! I ran the fusiondrive command...

Got this liquid damage board. I have 20V on usb-c meter. With battery I get 20V 2A so it seems charging well, the fan spins also with and without charging cable. Without battery I get 20V 0.55A. Board reacts to power button, opening the lid, pressing the trackpad or a keyboard key. I can see...

No sorry I should have mention that! HDD doesn't show in disk utility I see only the SSD, I even tried while I was there to plug in a nother hdd but same thing. The HDD is known good because I tested it with external usb enclosure and it works fine and shows the volume. I am suspecting a...

This iMac comes from companies returns. It was EFI locked, I did the mistake to solder the bios to an adapter and read it with the medusa 3. Instead of getting an incompatible error message because the medusa 3 doesn't support it (at least the firmware I have), the medusa read only half the chip...

Yes I actually started with a good inspection on both sides of the board I don't see any corrosion. I tried DFU mode Revive and Restore and it ends up with Error 4005 (can't restore the target ...gave up waiting) Nothing change...Thanks

Got this board slightly water damaged, It is stuck at 20V 0A. PPBUS_G3H is 12,60V PP3V3_S5 is 0V and no short diode mode is PP3V3_G3H_PMU_VDDMAIN 3.3V PP1V1_SLPS2R 1.1V PP1V1_SLPDDR 1.1V PP3V3_G3H_RTC 3.3V PP1V8_SLPS2R 1.8V PP3V3_AWAKE 3.3V PP5V_G3S 5V PMU_ONOFF_L 3.3 V I must admit I really...

I lifted the coils on one side and found the low values coming from PP1V_S5G and PPVCCPCH_S5G...:( Removed also the feedback resistor going back to the u7800, but the low diode mode values are still present. I started to isolate components on the PPVCCPCH_S5G path (only few caps on this rail)...

Oh forgot to post other u7000 voltages: R7075 is 5ohms and VDDA/VDDP is 5V VR1_3P3 is 3.3V A/BMON are both 0V / 0V (char only) with working board I get 0,050V / 0V (charger only) TBA_COMP is 1.1V noticed it was 1,6 and 1,5V on working board I compared diode mode reading with a working board...

This board was liquid damage with 5V 0A. Corrosion at cd3215 and nearby, also the PI3USB32 chip (the one we don't see on schematic &brdvw) was corroded. Reflowed both of them and replaced all resistors around both CD32s. Now I get 20v 0A and ppbus_g3h 0V with no short (diode mode 0,410)...

Well, I’ll put it aside in case « one day » I have a an exact matching donnour board, I think it should be the same storage size, otherwise some resistors configuration will have to be modified probably like ram strap resistors in older models. No big expectations here just experiments. Thanks...

This board was 5V 0A with PPBUS_G3H missing and full shorted to ground. No liquid at all. Traced back the short to U9080 TPS62180 ssd's regulator, it was visually totally blown. Once I removed the short on PPBUS_G3H I noticed both SDD nands U8600 and U8700 were totally shorted (very hot)...

I replaced U7100 and it works now!! I know it's an exceptional luck, specially that this chip is surrounded with sillicon there was no corrosion under it, but the ppbus_g3h burned via going into the chip leads me to believe it may took a hit... I replaced it out of desperation. Will check now if...

I agree that much more signals are involved and required and anything can mess up the proper function of U7100. I forget to mention that I started with a known working and ME cleaned bios but nothing changed. I think this one may be a nightmare as it will be difficult to pinpoint a resistor...