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I changed the chip without any result. But I found this. The 0,5A current goes to U0702. And here is the strange thing. On the C1819 is a short. You can measure it, but when voltage inject short is gone. Found out that every time I plug in the charger there is a short and after a time the short is gone. So I found out that the short is produced by Q7772. Unsoldered Q7772 short is gone and current draw and charging is much better but when plug in charger iPad freeze and goes black. Return to life unplug and plug in battery. Found that this mosfet can be found on iPhone X mainboard, actually not...
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iPad Pro 12,9 1st Gen A1584 what part is this?
Hi, I'm wondering what part is this? Cannot find any schemaits or part number. The "+" can mean that this is a MAX chip I know it from Nintendo switch. It is located directly to the tristar chip....1 Photo
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Thank you for the hint. I have checked all pins, all values looks ok. I have here an iPad Pro 11" 2nd gen which have same chip. The values are all the same. Also checked with usb-c tester, also everything is ok....
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I changed the PMIC today with same result. It works on battery, if charger plugged in iPad freeze and goes black.
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Today I tried new battery and the iPad is booting into system. Can use it like normal. But in the moment I plug in the charger iPad is freezing and goes black. Unconnect and connect battery again same game. The battery is charging for some seconds with about 30W but after some seconds it goes to 0,5A and stuck. I reflowed the PMIC without result. So the only thing I can do here is change the PMIC. Other ideas? Thank you
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Sorry but I got this idea occasionally. Normally an iPad starts up for seconds without battery. It seems that an M1 iPad cannot do tzhis. I thought battery is ok because it have over 3,6v. I will try now with new battery
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Can you point me where I can find the # of the logic board? Actually cannot find it. This iPad died over night for some reason with plugged in charger. With battery connected, current goes immediately to 0,5A. With no battery connected it goes to 0,1A. Actually I have connected an iPad boot cable and the iPad is booting into system. So it looks like the battery is faulty?
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Thank you. Contacts are very well the iPad is like new. Just measured the battery voltage, it's at 3,66V. I charged the iPad the whole night but it hasn't charged the battery. I don't know if this Generation iPad can show the Apple Logo for short time without battery connected like the older models? I found schematics for this iPad but missing boardfile. Anyone have it?
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good day, I have same iPad which is dead. Current draw is 0,5A@5V when battery is connected and 0,1A without battery. Didn't found a short, I can measure 3,7V and 5V around the PMIC. With IR cam the PMIC gets slightly hot about 30°C with battery connected. Checked a lot of caps, no short. What do you think is it worth to change the PMIC or other ideas? Thanks
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iPad 7 A2197 dead
So I have here this board which is dead. Current without battery is about 25mA with battery 470mA. I checked all voltages, missing this one:
PPVDD_GPU
PPVDD_GPU_SRAM
PP1V8_TOUCH_EXT_SW
PP3V0_ALS
PP3V3_ACC
PP1V25_REAR_CAM
I don't know if these voltages are coming up, when iPad is booting. I have changed the PMIC without any result.
The PPVDD_GPU line have 8,2 ohms and in diode mode it is short. I have injected 0,8v in this line, only the A10 chip is getting slightly warm.
Any ideas?
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iPad Air 3 no charging
Hi I got this iPad Air 3 Wifi only here which was dead from one day to other. I found out that U8500 had a short. Replaced U8500 and after that the iPad worked for about 5 seconds and dead again (current was 600mA without battery). Then I found a short on VDD_Main. Found that C81D7 cap was shortet. Replaced the cap short gone. Now the iPad can boot up with battery but no charging at all. If plug in charger says 0,000A but on the display it says that it is charging. When plug in the board without battery, current is looping between 80mA and 0mA like about 3 seconds 80mA then 3 seconds 0mA and so...
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Re: MacBook 12" 2016 820-00244
I have checked:
VCIN of U7210 and U7230 = 5,10V
VIN of U7210 and U7230 = 8,70V
ZCD_EN = 0V = CPUCORE_FCCM
CPUCORE_FCCM is produced by U7100
VIN of U7100 = 8,7V
VCC of U7100 = 5,1V
I don't see an enable pin for U7100. Schematics says for VIN 12,9V I got 8,7V. Maybe this is problem or bad U7100? Or something else?
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Re: MacBook 12" 2016 820-00244
I have checked with a 2017er 12" macbook, resistance is same 10,5ohm but voltage is 0,635V. I will later check the parts which producing this voltage
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Re: MacBook 12" 2016 820-00244
Voltage is 0,0V and Resistance 10,2ohm. Measurements took on C1130
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Re: MacBook 12" 2016 820-00244
I found an old usb stick, this turns on for 5 seconds and then goes off. Doesn't matter if macbook started with battery and only plugged in usb stick or with usb hub
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Re: MacBook 12" 2016 820-00244
So the charging looks like fake charging because since one hour still 1,4amps. The whole mainboard is warm especially the cpu. I can also plug off the charger, system still running with battery because if connect usb stick the led on the stick is on. Also the monitor notice that there is a signal but no signal there.Very strange
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Re: MacBook 12" 2016 820-00244
It looks like it would like to read something and then it cut down the power. I see a problem because with the hub it is only providing 5V not 20V. Actually I have plugged in power for little longer and it seems to charging the battery actually with 1,4A and 20V. I will wait untli fully charged and try later to start with battery. I have noticed that the D6900 light is on. I don't know what this is for. With the hub the Diode is blinking.
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Re: MacBook 12" 2016 820-00244
Not sure how to do this because there is only one usb port. I have USB hub which has 2 normal usb ports and usb-c for load but if you plug in the mouse and plug in DC there is mouse activity without macbook.
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