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Thank you for additional information. I will buy LD1117AS12TR (for 1.2V, [url]https://eu.mouser.com/datasheet/2/389/ld1117a-1849492.pdf[/url]) and AMS1117-1.5 (for 1.5V, [url]http://www.advanced-monolithic.com/pdf/ds1117.pdf[/url]). Both of them and ASM1117 on my conversion board have the same pinout (1 - Gnd, 2 - VOUT, 3 - VIN).
As far as I understand the datasheet, LD1117AS12TR can be used with ceramic capacitors I have on my board. While about AMS1117-1.5 I am not so sure. It says about tantalum capacitors, not ceramic. Is it ok?
My programmer supplies 3.3V, I checked...
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🙂 Yes, TI version has higher voltage requirements. It even does not support 1.8V and meant to be used in 5V to 3V shifters. It confused me too. But I think the logo on my IC is Nexperia (or its Chinese knockoff), which supports 1.8V.
I can order both ASM1117 for 1.5V and 1.2V and try it out. With 1.5V it should work just fine, don't know about 1.2V.
According to my latest question, do you think it is safe to put 1.5V on MX25S6473F inputs? Vcc can be 1.14V-1.6V.
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Actually, it seems that Nexperia ALVC164245 used in my 3.3 to 1.8 level shifter supports wide voltage range, from 1.5 to 3.6V ([URL]https://assets.nexperia.com/documents/data-sheet/74ALVC164245.pdf[/URL]).
MX25S6473F (IC from MacBook) has Vcc range of 1.14V-1.6V, according to its documentation ([URL]https://www.mxic.com.tw/en-us/products/NOR-Flash/Serial-NOR-Flash/Pages/spec.aspx?p=MX25S6473F&m=Serial%20NOR%20Flash&n=PM2860[/URL]).
How do you think, will it be okay to just convert my level shifter to 1.5V (by replacing ASM1117) and use it with MX25S6473F IC? Yet...
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Sure. Please see the photos attached. It is based on ALVC164245 IC and buck converter AMS1117 1.8V. I assume AMS1117 can be replaced with the one that outputs 1.2V instead of 1.8V. The question is can I replace ALVC164245 with TXB0108PWR? I should figure it out.
Thank you for your explanation! If any level shifter is available for purchase in US/China, I can buy it and wait some time for delivery. Although, I think with your help I can built my own based on TXB0108PWR....
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Programmer for MX25S6473F (MacBook A2681, U1900, SPI ROM, 1.2V power)
Hi. Please share your knowledge, which programmer can be used to flash firmware for MX25S6473F (SPI ROM, 4x4mm 8-XSON)? This IC can be found in MacBook Air M2 (A2681), U1900. Power and data are 1V25.
[URL]https://www.mxic.com.tw/en-us/products/NOR-Flash/Serial-NOR-Flash/Pages/spec.aspx?p=MX25S6473F&m=Serial%20NOR%20Flash&n=PM2860[/URL]https://Hi. Please share your knowle...ww.mxic.com.tw
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MacBook Pro A2289 (820-01987-A) No boot/image, but boots to DFU
Hi everyone. Just a reminder I am not a professional repair technician, fixing Apple electronics is my hobby.
Recently got my hands on MacBook Pro A2289 with interesting behavior. Pristine condition, no water damage, no visual issues whatsoever. It has no image, no CapsLock, no life except the fan is spinning. But it is able to boot into DFU and recognized by another MacBook. I tried to revive and restore the laptop, but the process ends when the MacBook usually should show an Apple logo with a progress bar. I assume the main power lines and T2 are working. It seems like the Intel...
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Re: MacBook A2179 water damage, probably bad T2
Thanks for your input!
Considering T2 chip replacement. I think I found the donor board and may try to do a T2 swap soon. I wonder, what will happen with the laptop's serial number after T2 replacement? Will it stay the same of will be transferred from the donor laptop along with T2 chip?
As far as I know, MB serial number are stored in EFI chip. At least this serial number is showed in "About this Mac" dialog. But T2 chip stores some iCloud activation data. Should EFI chip be swapped from the donor...
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Re: MacBook A2179 water damage, probably bad T2
Thanks for your response! I tried to connect it to another MacBook (Air 2018 to be specific) through Apple Configurator, but it does not detect it as a device. Occasionally host MacBook showed "This thunderbolt device is not supported" (or so) pop-up. But nothing comes up in Apple Configurator. I tried to connect it using Apple Type-C cable that comes with the MacBook, btw.
My thought it is not in DFU mode, because of looping Amps reading on voltage meter and looping voltages from PMIC. PMIC voltages are up then...
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MacBook A2179 water damage, probably bad T2
Hi everyone. First of all, repairing stuff is my hobby so sorry if I ask dumb questions.
I got a water damaged A2179. Audioboard was seriously damaged and connector shorted. Got 5V on charger. CD3215 are OK, as far as I can tell. The only places with corrosion are audioboard and Q7065 (which I believe is responsible for battery charging and not so interesting as of now).
Followed up bootup sequence from here: [URL="https://repair.wiki/w/A2179_2020_MacBook_Air"]https://repair.wiki/w/A2179_2020_MacBook_Air[/URL]. Found that I have neither of voltages from...
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