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U7000 is clean but I do see some crud around U7100. For the newer devices isnt U7100 the power ic?

no corrosion present. I see the sxhematic says 13.1

Well firstly the beep on the ANT lines is normal. I tested on another board. I pulled the unit back down then assembled it again and it worked. The bad cap on RTC_RESET_L fixed the problem

Okay i tried with the hz setting on my multimeter and got 32.76khz on sysclk_clk32k_pch (u1900 pin 10)

will i need an oscilloscope for this?

Hey I have a 820-00281 Motherboard with no power. No water damage but inside was really dusty. I got the following readings ppbus_g3h = 12.61v PP3v3_G3H = 3.4v PP3v3_SUS = missing PM_BATLOW_L = missing PP3V0_G3H= 3.0v PCH_INTRUDER_L= 2.8v PM_DSW_PWRGD = missing PM_SLP_SUS_L= missing...

Got it sorted thank you

Okay I think I have narrowed the problem down. Okay so I pulled down the system to inspect. No long screw damage. Al ways are there so I decide to to put it back up and it works. Used it for about an hour turning it off and on to make sure everything is good. Turn it off and install the 3...

Okay so every thing was great! Powered on and I found the reason for the folder. Macbookbook was booting. Put the board back in, screw it up and no power again. Now I have OL on PP3v3_G3H. PLEASE help

okay so we have powerr!!!!:cool::cool: Now we have a blinking folder with a question mark

PM_BATLOW_L = 3.3v PCH_INTRUDER_L = 2.8v PM_DSW_PWRGD= 3.4v PM_SLP_SUS_L= missing RTC_RESET_L= 3v (found a shorted cap while measuring , was 110mv before) PCH_SRTCRST_L= 3v PP3V0_G3H= 3v as i type PM_SLP_SUS is back now that i removed the bad cap 3V3_S5 is back 3V3_SUS is back I think I may...

Sorry never mind you are right about the 3v3_SUS. I will check the others when I get in.

Thanks for your reply. I will check the lines you mentioned when i get to the shop but I don’t have an oscilloscope so i won’t be able to check the signal . Maybe i’m reading something wrong because I swore I saw in the schematic that 3v3_s5 enables 3v3_sus.

Okay so after some checking I see that allot of the lines missing have switches powered by pp3v3_s5 in common so I am guessing that is missing (will check when I get to the office. Providing that is missing I will have to check the lines at U3400. Can anyone correct me if I am wrong?

Good Day, I am new to macbook PCB Repair but I usually fix iPhone and iPad PCB so I have some knowledge and skill . Please bare with me. I have a Macbook 820-00239-A board which got water damaged now we have no power. With battery disconnected and charger plugged in PP3v3_G3H - Present...