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no history, but looks clean can u post me a link for a clean me bios? its an 820-01061

hi, got this iMac, holding down "Alt" by turning on I can select wich drive. This is not turning off the device after selecting external known good disk I can see the apple and the loading line, after some milimeters from the loading line it turns off completly and start again. RAM I replaced...

ok, Problem solved, thanks for help. I made backup from client disk then i deleted the disk in the machine and installed new high sierra, after that i upgraded to catalina(this was original osx on client disk) then I migrated the data from the backup(started with another machine) to the client...

and after upgrade if no error should i try a migration from the original catalina client disk?

the original is catalina with the error, the machine is A1398 2015 i cloned a backup disk and installed big sur and that gives the error as well i tryed the disk with big sur on A1706 -> no error A1502 2015 -> no error now i started from thhe A1706 with external disk from client with big...

the problem is still there. before i try your proposal I tryed the ssd external from another macbook (A1706) there is okay, no battery service

yes thats true, its today already much more little but still there

Hi folks, I cleaned a 13" A1502 with lysterin, display is like new now, after turn on there is now in the corner left side a brighter area, what i did wrong? what can i do, has someone experience with this?

can there be problems ?

that worked, thanks, i tried that before but with "ALT + "T" :-) and thought it dont work The board is a mess but I could made in Target Mode a complete clone. problem solved for now.

hi, i have an intresting case got this macbook pro its turning on and booting until the password screen, cursor is blinking but it is not possible to use the kbd or the tpad. external kbd or mouse not working as well. the client want to copy the ssd data, no idea how i found out that...

hi is it possible to replace topcase from A2337 M1 chip without problems? or is it possible that the mainboard dont turn on after that until apple service turn off the blocking?

ok, so that means before i reballed u3900 the chip was with problems as well?

with el capitan is the same effect. only that it drops to zero later, about this moment when the screen is flicker before curser can see. (in osx elcapitan half way from the load line under the apple logo)

PP1V2_CAM_XTALPCIEVDD has 1.19V and it drops to 0 like the 25Mhz Signal in about 1/3 of the line under the apple logo while loading osxi now will try osx el capitan

I still replaced the J4002 isight connector but not better but now i notifyed an intresting fact measuring R4008 pin 2 the board has a nice wave 25Mhz signal after starting, tried big sur and high sierra comes apple logo and under the logo the loading line, in about 1/3 of th line the 25Mhz...

no, there is only the message "No video capture devices were found"

I replaced now the 3900 but still the same :-( only ALS sensor is working

conector resoldered without any change tried to detect u3900 via terminal but the command lspci doesnt work instead i used ioreg -l | grep PCI got this but i dont know what it means

yes I forgot to post, checked already L4007/09 in diode mode same readings like on a working board tomorrow i will resolder cam connector and try in terminal to detected u3900 on the PCIe bus like described, thanks @piernov is this what i wrote above not the data lines? ... MIPI_CLK_P and /N...