kevingill
Senior Member
Last Activity: 12-19-2024, 04:24 AM
Joined: 06-25-2013
Location: Lancs
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These are usually symptoms of a corrupt BOOT ROM. You might want to flash it with a cleaned ROM and try again.... -
You'll have to measure each component and check against the schematic to see which one goes where. The 8 leg components are probably resistor or inductor ladders and can be placed either way round.
You probably have too much air on your hot air workstation, or the temp isn't what you think it is.
I'd mask off the area first and always apply flux around the area to speed up the solder melt....Leave a comment:
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That would only make 10.4v, so you must have missed out a couple of legs of cells.
You've only shown 4.
Report B- to B1, B1 to B2, B2 to B3, B3 to B4, B4 to B5, B5 to B+Leave a comment:
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That's the SEP EEPROM isn't it? Not sure what code that holds and whether it's keyed to the MacBook. Can you get a spares board? Usually the easiest way to get hold of the chip?...Leave a comment:
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Great news, So it was the batteries all along that caused the problem? Revive clearly was the way forward, but I presume with original batteries, even this method wouldn't work?...Leave a comment:
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Interesting that all 10 exhibit the same fault. I wonder if the environment has caused all 10 to fail, or just the amount of time stored? Have you left them on charge overnight to see if the battery voltage comes up? Do they go into DFU mode? They should at least boot to diagnostics or boot selection.
Also, are they iCloud locked?...Leave a comment:
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Have you replaced C9560 BTW?...Leave a comment:
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It's looks as though it's trying to get to S0 with PP3V3_S0 pulsing. However, PP5V_S3 is at 0. I'd take a good look around U7201 to find out the issue.
Have you removed all non essential cables/RAM/etc?...Leave a comment:
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Do a check on all the power rails to see which one isn't coming up. The critical ones are in the schematic.
Start at S5, then S4, etc....Leave a comment:
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What does PP3V3_S5 measure in resistance to ground?Leave a comment:
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Yes, it will work...Leave a comment:
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Sorry, don't have the schematic/boardview. Is the chip that generates PP1v8_s5 looking OK? I presume the other S5 voltages are OK?...Leave a comment:
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Go through the schematic and measure the main power rails voltages. Post hereLeave a comment:
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This software won't help sadly...Leave a comment:
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Probably stored in the ROM somewhere. Wouldn't worry about it TBH...Leave a comment:
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Have you made any progress with this project?Leave a comment:
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What does the area around Y5110 look like?
Also, is U5110 nice and clean?Last edited by kevingill; 07-03-2024, 01:55 AM.Leave a comment:
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Is the problem with PP5V_S3_REG or PP5V5_CHGR_VDDP?
Are you using an 85W charger BTW?Leave a comment:
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That would be against forum rules - sorry...Leave a comment:
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I have successfully written the EFI using a similar method, but you may need to try with/without battery and/or power supply. If that fails, then certainly remove the EFI ROM with hot air and do it that way....Leave a comment:
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