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Diode mode reads 350. I cannot measure resistance because it changes while I am reading it (it either keeps increasing or decreasing for reasons I do not understand).
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I also checked and 5v are being fed to U7000 (isl9420), but then I get 0v on PP3V3_G3H, is that normal?
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Here are all the measurements in diode mode (red on ground):
Inductor: Expected - Actual
L9021: 273 - 320
L9020: 273 - 320
L9030: 349 - 295
L9080: 358 - 310
L9081: 358 - 310
L6900: 362 - 316
L6901: 362 - 316
LB700: 190 - 407
L8102: 28 - 130
L7270: 12 - 35
L8100: 116 - 199
L7220: 3 - 9
L7210: 3 - 9
L7410: 2 - 9
L7420: 2 - 9
L7430: 2 - 9
L7702: 56 - 70
L7600: 401 - 334
L7660: 413 - 348
...
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resistance to all PP1V1_UPC_**_LDO_BMC rails is 130k ohms.
Diode mode beeps for all inductors in groups 3 and 2 (L7220, L7210, L7410, L7420, L7430)....
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Hi all!
Diagnosis (following repair.wiki and CD3215 Bootup Sequence):
PP3V3_UPC_**_LDO - 3V3, present, for all 4 CD3215s
PP1V8_UPC_**_LDOA - 1V8, present, for all 4 CD3215s
PP1V8_UPC_**_LDOD - 1V8, present, for all 4 CD3215s
PP1V1_UPC_**_LDO_BMC - Not Present, for all 4 CD3215s
is it an indication of a bad cd3215? Is it normal for me to observe PPDCIN_G3H (see my last reply)?
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My multimeter does not have OL, it reads 1 instead. It reads 1 when measuring resistance to ground of F7000 (both sides), under all ranges (2M - 200).
Resistance on F7000 (probes on the two ends of F7000) is close to 0 (resistance of the cable).
The voltage to ground of PPDCIN_G3H is 5.16v, measured at the test point on the left of C8464.
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The voltage on both of the F7000 sides cycles between 1.1 and 0.95 v.
Resistance to ground is 1 (infinite? measured with the 2M ohm setting of my multimeter).
should I remove f7000? this might take some time as I do not have a hot air station here
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Macbook Pro A1989 820-00850 No Power
Hi all!
I have a Macbook A1989 820-00850 that completely died out of the blue.
I have used a usb tester and the computer is (not) drawing 5v 0amp.
I have now taken the board out and there are no visual clues of components going bad.
Can you help me diagnose the problem?...
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