Recent content by SanDiegoHB

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    820-00281 how to test switching mosfet

    2016 MacBook Pro 15" A1707 logic board 820-00281-10, how do I test the switching mosfets Q3100, Q3200 etc. I'm suspecting they're the reason battery isn't charging thanks
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    i5-4690 in the 820-5029-A

    Late 2014 27" iMac, I have a good i5-4690 cpu and wondering if I can put it in the 820-5029-A logic board (appears to be the 4gb graphics version)?
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    2015 MBP A1398 820-00426-A boot loop incl recovery and safe

    my apologies and thank you- **2015** A1398 EMC 2910 logic board 820-00426-A
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    2015 MBP A1398 820-00426-A boot loop incl recovery and safe

    Discovered part way into diagnosing that the battery is swollen and not holding any charge, so basically all diagnostics have taken place so far with power adapter only. Initially (when the battery was still connected) the MBP allowed me to boot from external disk into Catalina recovery, and...
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    A1990 2018 820-01041, fans on, no post, no display

    ok, yes that's the error code I get, I've tried different usbc and thunderbolt cables, different OS's, and same error
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    A1990 2018 820-01041, fans on, no post, no display

    ok, hopefully I'm doing this right. I do not know of a way to have the battery plugged in, so I have the multimeter probes where they need to be and then I plug the board into power (96W genuine apple) and monitor voltage. at that point, the voltage reads zero for about 10 seconds and then .975...
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    A1990 2018 820-01041, fans on, no post, no display

    all of these remain at the levels listed for at least a minute. my original post comments about configurator were my DFU mode attempts. is there a different CPU temperature I should be looking at? There are many CPU core points on this board but not sure which if any should have certain voltage...
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    A1990 2018 820-01041, fans on, no post, no display

    Also, cpu_pwrgd, cpu_vidsclk, cpu_vidalert, and cpu_vidsout all measure just barely above 1V
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    A1990 2018 820-01041, fans on, no post, no display

    no history but it looks clean, no evidence of liquid damage I get .97v on PPVCC_S0_CPU
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    A1990 2018 820-01041, fans on, no post, no display

    amp meter shows it's drawing 20.3V and 3+amps, and an iPhone plugged in is getting about 5V and 1 amp. It went into dfu mode for configurator but no luck tried monterey Big Sur and Catalina, tried external monitor, tried safe mode and all the usual T2 commands for smc pram etc, tried target disk...
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    resistor power rating?

    hello, first of all disclaimer, this is for a Lenovo flex laptop. An 0402 resistor, millimeters from the firmware chip, broke off. The schematic and board file both indicate: "15 0402 5%". I'm assuming the 15 is ohms. Without any indication of power rating I went with 1/16W, but this did not...
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