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Macbook A1990 820-01041- Help schematic and boardwiew
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MacBook Air A1932 Keyboard backlight not working
After updating the system to Sonoma, the keyboard backlight does not turn on! Preinstallation through recovery did not change the situation. Resetting smc and pram did not help! restore via dfu is also zero! I put the board in another Mac and it turns on the light! I put a board from another Mac into this one and the backlight works too! Only the original board does not turn on the backlight! Can anyone please advise, I beg you!
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if the sound works through the 3.5mm connector, then T2 initializes the sound to the board and the problem is not in T2!? I’m thinking correctly since I’ve already transplanted T2 2 times, it didn’t help either and there weren’t any unsoldered nickels
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[QUOTE=obelix24;n3232965]check if the connector on motherboard where you connect audio board is ok. I have this issue on other macbook connector where audio board flex was connecting wasn't making good contact on one side (with naked eye it wasn't visible but under microscope it was clear that the issue is there) and therefore i was able to see speakers, increase / decrease audio, audio via headphone jack was working but internal speakers where not outputting any sound.[/QUOTEEverything has been checked under a microscope and everything looks new. just in case, I washed everything with alcohol...
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the voltage across these resistors is 1.8 volts, in diode mode 0.365
I remind you that the sound is output via bluetooth and through a 3.5mm jack, there is no sound only from the built-in speakers...
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[QUOTE=mon2;n3232122]Review the headphone connector on the audio board. Use compressed air to blow out any gremlins.
The audio board may need to be replaced for the same reason.
[url]https://youtu.be/oYbgYZhm_Dg?feature=shared[/url][/QUOTE
The problem is not in the connector or in the sound board because I install another motherboard and there is sound! I also installed a 3.5mm jack card from another laptop and there is no sound.[QUOTE=mon2;n3232122]Review the headphone connector on the audio board. Use compressed air to blow out any gremlins.
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MacBook Air 2179 no sound
after replacing the T2 chip there is no sound on the built-in speakers! When connected via bluetooth or via a 3.5 mm jack, there is sound. the system sees the inside of the speakers but there is no sound! what could it be? what to pay attention to?
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SSD Macbook A1708 not working
model: 656-0076B
EMC 3196
help with identifying the microcircuits, maybe on what board from MacBooks is it installed?...
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Macbook A2289 won't turn on
[B]820-01987[/B]
A cyclic reboot occurs on one of the ports. on the second hangs 5 V and 0.257-0.300 A
who faced such a problem? What to check ?
[B]U3100[/B]
PP3V3_UPC_XA_LDO=3.299v
PP1V5_UPC_XA_LDO_CORE=1.58v
PPDCIN_G3H=5v
[B]U3200[/B]
PP3V3_UPC_XB_LDO=3.290v
PP1V5_UPC_XB_LDO_CORE=1.58v
PP3V3_G3H_RTC=3.3v
PPDCIN_G3H=5v[B]820-01987[/B]
A cyclic reboot occurs on one of the ports. on the second hangs 5 V and 0.257-0.300 A
who faced such a problem? What to check ?
[B]U3100[/B]...
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Macbook A1989, 820-00850, won't boot. 20V, 0A.
Today I have a [B]MacBook A1989[/B] at work [B]820-00850[/B]. When assembled, the laptop switches to [COLOR=#1abc9c]20[/COLOR] volts but the consumption is [COLOR=#e74c3c]0.00 [/COLOR]ampere. if the motherboard is on the table then the consumption of all ports is [COLOR=#1abc9c]5[/COLOR] volts and[COLOR=#1abc9c]0.35[/COLOR] amperes and does not go to 20 volts only if you assemble a MacBook.
Here are some measurements, maybe someone can tell what the problem is.
The initial problem was a burnt out induction coil[COLOR=#d35400] L8504 (replaced[/COLOR]).
When connected to another...
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MacBook A1989. Stuck in DFU and won't turn on!
MacBook A1989. does not work with dfu. Stuck in DFU and won't turn on!
20 volts and 0.00 amperes
Does anyone have any suggestions?
It's possible that the problem is in the EFI (BIOS),
who has the EFI ROM file please shareLast edited by PITERPENY; 01-12-2024, 01:48 AM.
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Having a donor board with a bunch of spare parts, I would return everything to its place, it's not that difficult, that's what I would do! and also look at the startup algorithm for this chip. [URL]https://logi.wiki/index.php/CD3215_Bootup_Sequence[/URL]https://Having a donor board with a ...Sequence[/URL]...
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