geiti94
Member
Last Activity: 01-02-2025, 08:28 PM
Joined: 02-28-2023
Location: Langnau Am Albis
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that board is strange. all volltages are here. looks like a broken t2 firmware now but i cant enter dfu mode. when i check on the pad dfu_status stays at 0V instead of 1.8V -
i replaced now U6940 with one of a know working board but icloud locked. Pin 10 still 0V. Voltage at R8015 is 3.3V.Leave a comment:
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nothing changes. CHGR_RST_IN stays still at 0V. Faulty U6940? I Tryed it to reflow it too with flux and nothing changed. is there any mod for bypass U6940 for testing before i order then a new one?Leave a comment:
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[B]PP3V3_G3H_RTC_X [/B]is 3.3V. [B]PP1V8_SLPS2R[/B] have 1.81V. U6940 pin 10 are at 0V[B]PP3V3_G3H_RTC_X [/B]is 3.3V. [B]PP1V8_SLPS2R[/B] have 1.81V. U6940 pin 10 are at 0V[B]PP3V3_G3H_RTC_X [/B]is 3.3V. [B]PP1V8_SLPS2R[/B] have 1.81V. U6940 pin 10 are at 0V[B]PP3V3_G3H_RTC_X [/B]is 3.3V. [B]PP1V8_SLPS2R[/B] have 1.81V. U6940 pin 10 are at 0VLeave a comment:
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since SMC_RST was not presend in A1990 Boardview i checked firsr A1706 one since they use same u7000 chip and saw it is on Pin 39. on A1990 the name is TP_CHRG_SMC_RST_L and there is a test point on the mainboard. there i get 1.8V instead of 3.3V. SMC_USBC_INT_L have an other name too on A1990. The Name is here UPC_I2C_INT_L and there i have 0V.Leave a comment:
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ok i am getting crazy with that board. smc_rst is for some reason only 1.8v instead of 3.3v. u7000 chip is defective?Leave a comment:
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so replaced the chip today but still same problem. what else it can be?
measured again ppbus_g3h and now it fluctuates from 3.3 to 9V but never to 12v
Update: Reballed and resoldered again the new chip. ppbus_g3h again 12V and PP1V1_UPC_XA_LDO_BMC is now here but mainboard still draws only 5.18V and 0.040A from what my usb tester sayLeave a comment:
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yes i ordered [B]CD3215C00[/B] and not [B]CD3215B [/B]or [B]CD3215A[/B]. i ordered better flux now too so that i have then everything.
you think its better to use the solder balls for reballing the chip or soldering paste with melting point at 140c?yes i ordered [B]CD3215C00[/B] and not [B]CD3215B [/B]or [B]CD3215A[/B]. i ordered better flux now too so that i have then everything.
you think its better to use the solder balls for reballing the chip or soldering paste with melting point at 140c?yes i ordered [B]CD3215C00[/B] and not [B]CD3215B [/B]or [B]CD3215A[/B]. i orderedLeave a comment:
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ok ordered now new c3215 + reballing stancil and 0.3mm solder balls. after everything is here i will replace the chip and report backLeave a comment:
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measured now everything. 1 BMC is missing. and that is PP1V1_UPC_XA_LDO_BMC the one that use the usb c used for dfu. can i take the cd3215 from an icloud locked a1932 board?Leave a comment:
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checked now again the complete board for shorts and found nothing except the false positive of cpu rails since cpu have low ressistance.i am thinking to order some c3215 and try it if works thenLeave a comment:
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measured now everything with the apple charger.
all voltage up to PPDCIN_G3H are here. but the one that should have 20V have only 5V.
TBA_AUX_DET and SMC_RST_L i could not find it.
can be they stay at 5v because battery is not installed?Leave a comment:
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Voltage on post 5 goes down only when i connect first the charger to the usb c port used for dfu and then connect it to any other usb port. It habe then 20V on usb but only 3 to 5V on ppbus_g3h.
I am using an acer type c 65w charger. Tested apple one too and same happens. I am thinking problem comes from usb electronic since when i connect charger to dfu usb c port then i dont even get 5v from PP20V_USBC_XB_VBUS but i get then somehow 12V on ppbus_g3h
After i am at home i will check CD3215Leave a comment:
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ok got some strange behaviour from the device. sometime when i connect the charger to the top left port i get 20PP20V_USBC_XB_VBUS at 20V but then ppbus_g3h have only 3 to 5V
ok found out i get 20V only when i connect first charger to dfu port and then to an other usb port....Leave a comment:
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USB voltage i cant measure it since i still dont recived my usb meter.
ppbus_g3h have 12.3V measured at F7000 and F7001
PP2V5_NAND_SSD0 measured in continuity mode goes up to 975ohm and in ohm mode up to 28.9k
PP5V_G3S measured in continuity mode goes up to 1975ohm and in ohm mode up to 22.5k
i measured with the multimeter PP20V_USBC_TB_VBUS and PP20V_USBC_XB_VBUS and they are at 5V and when i try to measure ampere from there it stays at 0
@[B][URL="https://www.badcaps.net/member/223507-snazzysmith"]Snazzysmith[/URL][/B]...Leave a comment:
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Macbook Pro A1990 PP5V_G3S missing
Hello to all
I have a macbook pro A1990 820-01814 that dont turn on
PP5V_G3S and PP2V5_NAND_SSD0 are at 0V instead of 5V and 2.5V
Someone have a sugestion where t start for find the problem?
i cant set the unit in dfu modeLast edited by geiti94; 12-15-2024, 11:02 PM.
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