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Wing boards have finally arrived, any tips on how to proceed? They seem to have some "underfill". My plan would be to fix UB300 first, replace it with a reballed replacement chip and check for the 1.1V BMC LDO.

Thanks a lot for all your help! Now I can only wait till the chips and a stencil arrive..

I've checked all the 1V1 LDO rails again, with the charger on each port. The U3100 and U3200 are fine, they power cycle and I've measured 1.1V on each 1V1 LDO rail. However, the 1V1 LDO rail is missing on the other two CD3215 (UB300, UB400). So I guess they are both faulty. Even the one I've...

The 3V3 and both 1V8 LDO rails are ok on all four chips, but the 1V1 rail is missing on all of them. Do you think that all four chips are faulty, or could it be the capacitors that are connected to these rails? I bought my replacement from a german macbook/iphone repair shop and it came in a...

" "I've messed up some connections of the UB300 while soldering" Do you have now some bad solders/traces there??? " No, I meant that there might be some shorted pads under the BGA. Thanks for the advice on the diode mode reading, did wrong before. Here are the new values: Diode Test on Rails...

Sry, here are the values for the 1V1 LDO rail: PP1V1_UPC_TA_LDO_BMC: on CB304: 1.816V PP1V1_UPC_TB_LDO_BMC: on CB404: 2.685V PP1V1_UPC_XA_LDO_BMC: on C3104: 2.705V PP1V1_UPC_XB_LDO_BMC: on C3204: 1.817V So that means U3200 and the one I've already replaced UB300 are faulty. Could it be that...

Thanks for the quick reply! I put the original U2890 back and this side power cycles again. Regarding the liquid damage, Apple claimed this and my friend told me that he spilled some beer over it, one year ago. After that, the machine worked but stopped working a few weeks ago. Since then, it...

Hi! I'm an electronics student from Austria trying to fix a Macbook Pro A1707 from a friend of mine. He took it to an Apple store and they said it is a liquid damage and wanted to charge him 1300€ for a new logic board. Thus, he asked me if I could fix it. I have watched numerous videos from...