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820-01958 20v, backlight, no image

Outofwhack

Outofwhack

Member
No liquid history, no corrosion visible
Backlight comes on but no logo
CPU gets hot
Tried known good screen
SSD0 Voltage rails 2.5v, .8v, 0.9v all present.
No toggle of caps lock light
No external video
No USB activity

DM on pins J8500 1,3 .36v, .36v
 
Outofwhack

Outofwhack

Member
Yes, trying revive. Would not complete. Tried restore. Would not complete. Timeout waiting on DFU state.
Now get logo when starting holding Command R. Logo 30seconds followed by 15second black screen, repeat.
Capslock toggle working.
 
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Outofwhack

Outofwhack

Member
Command R now allows attempt to load recovery software from Apple. Does not attempt from local disk for some reason. However only 5th attempt completed without 2005F error but then said could not find host and went back to beginning.

Does appearance of apple logo signify NAND being read?
 
Outofwhack

Outofwhack

Member
There is no network connection and Im not seeing any flashing lights on my new UGREEN ethernet adapter when booting into internet recovery (Option Command R) on this faulty A2179.
It works fine (lights on adapter flash and it connects to the network) on a working A1706 when fully booted and on recovery menu (Command R) but not on internet recovery (Option Command R).
Any ideas? Ive replaced USB port flex just in case with no change.
 
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