Yes F7000 is removed off the board and I'm measuring from F7000 PCB pad#2 to the inductor L7420 and I'm getting 0.01 ohm.
When i inject 1.0V on the F7000 pad#2 (F7000 removed) i'm getting the same voltage on L7420.
Now, without power, the resistance to ground of L7420 is 6.7ohm (same as PPBUS_G3H rail).
So the first problem came from the U7420, which then fried the CPU? Is there any way of replacing the CPU without losing the data?
DATATECH85
New Member
Last Activity: 07-26-2024, 01:05 AM
Joined: 12-07-2021
Location: La Roche sur Yon
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Thank you very much for your prompt reply.
If I've understood correctly, I need to measure the resistance between the point where I measured 6.7ohm and all the inductors near the CPU? For example, I put my multimeter in resistance mode, one probe on fuse F7000 where PPBUS_G3H goes and the other probe on inductor L7420 (where there is CPUGT_SW2 on one side and PPVCCGT_CPU_PH2 on the other)? I'm getting 0.01ohm on this inductor.Leave a comment:
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Macbook Pro A1990 - 820-01041 Stuck at 5V / 0.02A
[FONT=Calibri]Hello,[/FONT]
[FONT=Calibri]I am currently working on a Macbook Pro [B]A1990 [/B](motherboard [B]820-01041[/B]) which is not charging.[/FONT]
[FONT=Calibri]The Macbook consumes 5V and 0.019A at USB-C. There seems to be a partial [B]short-circuit[/B] on the [B]PPBUS_G3H [/B]rail as I have 0V on this rail.[/FONT]
[FONT=Calibri]I've physically separated (by removing F7000 and F7001) PPBUS_G3H and the ISL9240 charging chip to see which side the short is coming from. Removing these fuses gives me 12.6V at the output of the ISL chip (PPVBAT_G3H_CHGR_REG).[/FONT]... -
Hi, I'm a technician working in a lab in France. I'm currently a hard disk specialist and I'm in the process of developing my skills in electronic circuit repair (thanks in particular to this forum).
Thank you very much for everything you do, your site has helped me many times !Leave a comment:
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