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820-3481
i checked the 820-3299 because i think no one has the 3481
J4500 has only SATA_SSD lines. so thats the reason isnt it? but may be the 3481 accept nvme?
and the 820-3299 has in the schematic a 1155 socket but my board 820-3481 has a 1150 socket. in the socket is the SR14D i5-4670
but...
hi got this device with liquid damage.
first accu was not good, with other one it turned on but dont recogniced the charger
after that i found liquid damage around U5200 and around F5200
i cleaned that up, found i2c_smc_pwr_3V3_scl had to high value in diode mode, replaced UD201, then scl and...
Hi, i wanted to uügrade this imac but there faces me some problems.
1. upgrade from i5 CPU to i7 4.0Ghz (4790K)
insert the i7 there i have only 1. and 2nd led after a wilhle second turns off and first is only on then second turns on again and so on, no dong, nothing
insertet the i5 all is...
Hi, got this imac with now signs of life, no led nothing, replaced with a known good power unit, nothing.
found short in PP12V_ACDC pin 3 and 4 J6900
figured out, that Q8450 is blown, replaced it and the short is gone
now already the first LED is coming up but after pressing power the LED turns...
Hi, i want to upgrade the ram here. found in the schematics RAMCFG 3..2 and 1..0
but wich resistors ? without boardview that will be a problem. can someone help me ?
i have Hynix 4GB RAM Moduls
So that will be 100K to R2291
and 10K to R2284,R2282, R2280
and to pull out in R2292, R2290, R2294...
i think i figured it out.
got another 11" 820-00164 and i had still 4 RAMs left, so I soldered them there in and the same problem occurs.
today i found out that the SEC K4E6E304EE-EGCE I ordered has only 16Gb that means 2Gbyte !
So I soldered 8GByte in the Board and configured it as 16Gbyte...
I use a laboratory power supply , until now that was good for all a2141
PP1V8_SLPS2R 1.81V
PP1V1_SLPS2R 1.11V
PP0V8_SLPS2R 0.81V
PP1V8_AWAKE 1.8V
PP3V3_AWAKE 3.36V
PPVDDCPUSRAM_AWAKE 0.81V
PP1V2_AWAKE 1.21V
the history is it stopped from one day top the other
I was sure...
Hi, just this device came in
20V draw with batterie
no dong, no display
checked the power sequenz from repair wiki
https://repair.wiki/w/A2141_2019_16%22_MacBook_Pro
PMU_CLK32K_PCH is ok
PMU_ACTIVE_READY is 1.8V
PMU_ONOF_L is 3.3V
PP3V3_S5, PP1V8_S5 is 0V
R8013 Pin1 has a nice sinus wave...
thanks tomtom67 from this i was inspired to try this.
the state now is i can start high sierra without problems and i can see the 16GB in the system information. the main problem still is its randomly freezing .
so my guess there is wrong timing configuration. what do you mean?
i have the 820-00165 4GB version and want it upgrade to 16gb
so i bought 4x SEC K4E6E304EE-EGCE and soldered it in
then i soldered the RAM straps like ino datasheet DDR3:SAMSUNG_16GB
CFG0: L
CFG1: H
CFG2: L
CFG3: H
that worked but coming apple and during loading 30% it is turning off
then i...