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I tried this mainboard in complete functional top case and still same. Also tried a working one in this top case, is also working. So it looks like it is a mainboard problem. C7020 and C7023 is both about 2,5 ohms. SMC_AVREF = 1,25V
Bott in safe not possible, it is loading till 70% and then it...
Good day friends,
I have actually this board here and I don't really know where to start to search. Sometimes it power on with apple logo and it is booting with full fan speed and very slow. Sometimes it is drawing current about 600-700mA fan full speed and nothing happens no screen. Tried to...
I have some update on this board. I found a mess/short under the onboard display connector see pictures. Unsoldered the connector all pins are fine. Because I have not diode values of exact this board I took values from the A1989 board. Pin 1 and 3 are oL. These are connected directly to cpu. So...
Schematics says Q64FVBYIQ this chip here is Q64FVYIQ this is looks the same. Also Alixpress sales this as the same. This chip I bought 5pcs was sold as the rom for A1534. What I have tried now is multiple times changed the chip, erased sold again, nothing changed. Also tried power without this...
I have now replaced the SPI Rom, it's not an quick job, because you have to solder and reball after programming. Noticed that there are 2 kinds of chips. Didn't got the original one, but it is possible to turn the chip 90° and it is ok. So now the situation is, that I got no voltages. The only...
The measurments were taken only board nothing connected. With battery connected the charger do instantly 20V. But error is same, doesn't matter if all components are plugged in or not. I found this topic here...
I found something very weird. When I connect the charger on the same usb side as the thunderbolt cable to other macbook and the revive the macbook, after some seconds in step 4 of 4 (installing system) the voltage jumps to 20V. In this moment UPC_I2C_INT_L = 1,8V. But it aborts with same error...
UPC_I2C_INT_L = 0,0V / 2,4Mohm / 0,47V
Why do you think U7000 is fault? Because in the repair wiki manual, it says that is very likely that U7000 is faulty.
I don't know why, but today board stuck at 5V and will not switch to 20V. I swear yesterday it switched to 20V. I will take later some new measurments but for the first, it switches to 20v only if battery is connected. Without battery PPBUS_G3H is 12,61V -> too low
I have flashed a new Rom but result is same. only difference is now, that it starts directly in DFU mode not in recovery mode.
I checked following coils, unfortunately not have a good board, but for some coils the readings are in felxbv:
L8100 = 0,16V should be 0,072V
L3500_VWR = 0,18V should...
So I have this board here, no liquid damage, the macbook looks like new. I checked some voltages and found out that PP3v3_S5 is missing. There is no short on this line, resistance is 112kohm.
Some measurments:
PPBUS_G3H = 12,60V
PP3v3_G3H_RTC = 3,390V
PP3v3_G3H_PMU_VDDMAIN = 3,355V
PP3v3_S5 =...