Hi,
I know this config with this issues have been discussed before, however, I went through all these threads & posts but I still have problems with my machine.
maybe I its good to know that after I bought the machine I gave all boards complete clean with isopropanol (8 hours of work), cleaned the psu (disassembled it), sticked 2x3,06 ghz processors in it, repasted and fixed the northbridge mount. everything went flawless, also firmware upgrades and install of Mojave without any problems.
here we go:
rx580 (sapphire pulse, 8gb) powered by dual mini 6pin top 8pin adapter. file vault deactivated. this setup worked without problems for 5 months.
suddenly the machine rebooted during easy tasks like browsing. sometimes also distorted screen.
solution: used a external ATX psu to power the gpu - worked.
conclusion: to less power from motherboard.
possible fix: pixlas mod.
after pixlas mod: machine not booting. no chime. black screen. fans of the GPU spinning, measured 8pin pcie cable - everything like it should be. mod was done right.
next: smc and pram reset.
after pram reset: got the boot chime back. but machine stays in a boot loop. diagnose button shows that psu is okay and that during the loop the EFI loads.
next: booting without gpu: machine boots. no loop. cannot verify if it boots until the boot screen - don't have the required network hardware here to access via remote access.
conclusion: faulty GPU or PSU problem
test1: rx580 in sonnet breakaway box. works with mbp 2017. GPU seems fine.
test2: powering the rx580 with external ATX psu (you remember this worked before) - again boot loop / black screen.
next: minimal configuration procedure. everything okay until I stick the GPU in the machine = boot loop.
....
used PSU's costs 150€ in my area. should I give it a try?
any help appreciated.
I know this config with this issues have been discussed before, however, I went through all these threads & posts but I still have problems with my machine.
maybe I its good to know that after I bought the machine I gave all boards complete clean with isopropanol (8 hours of work), cleaned the psu (disassembled it), sticked 2x3,06 ghz processors in it, repasted and fixed the northbridge mount. everything went flawless, also firmware upgrades and install of Mojave without any problems.
here we go:
rx580 (sapphire pulse, 8gb) powered by dual mini 6pin top 8pin adapter. file vault deactivated. this setup worked without problems for 5 months.
suddenly the machine rebooted during easy tasks like browsing. sometimes also distorted screen.
solution: used a external ATX psu to power the gpu - worked.
conclusion: to less power from motherboard.
possible fix: pixlas mod.
after pixlas mod: machine not booting. no chime. black screen. fans of the GPU spinning, measured 8pin pcie cable - everything like it should be. mod was done right.
next: smc and pram reset.
after pram reset: got the boot chime back. but machine stays in a boot loop. diagnose button shows that psu is okay and that during the loop the EFI loads.
next: booting without gpu: machine boots. no loop. cannot verify if it boots until the boot screen - don't have the required network hardware here to access via remote access.
conclusion: faulty GPU or PSU problem
test1: rx580 in sonnet breakaway box. works with mbp 2017. GPU seems fine.
test2: powering the rx580 with external ATX psu (you remember this worked before) - again boot loop / black screen.
next: minimal configuration procedure. everything okay until I stick the GPU in the machine = boot loop.
....
used PSU's costs 150€ in my area. should I give it a try?
any help appreciated.
