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820-00923 no display after screen replacement

A

ajdoc

Member
No liquid damage, J8500 in perfect condition.
MacBook came with cracked display (there was still image/backlight)
New screen fitted, Apple logo, progress bar and then blank screen.
Connected old screen and there is no image. Tested with another known good display and still no image/backlight.

When internal display is connected and external display all works fine on external but won’t detect internal display.

Checked that ‘new’ display on another MacBook and again Apple logo > progress bar > blank screen but when connected old screen all works fine.

EDP_PANEL_PWR_EN = 0V

Diode mode J8500:
J8500/1 = 0.207V
J8500/3 = 0.005V
J8500/4 = 0.652V
J8500/6 = 0.497
J8500/7 = 0.235V
J8500/9 = 0.237V
J8500/10 = 0.498V
J8500/13 = 0.235V
J8500/14 = 0.717V
J8500/15 = 0.235V
J8500/16 = 0.732V
J8500/19 = 0.236V
J8500/21 = 0.236V
J8500/24 = 0.498V
J8500/25 = 0.236V
J8500/26 = 0.498V
J8500/27 = 0.236V
J8500/28 = 0.638V
J8500/30 = 0.635V
J8500/31 = 0.527V
J8500/33 = 0.527V
J8500/34 = 0.563V
J8500/36 = 0.609V
J8500/37 = 0.525V
J8500/38 = 0.468V
J8500/39 = 0.529V
J8500/40 = 0.448V
J8500/43 = 1.1130V
J8500/44 = 0.532V
J8500/45 = 0.537V
J8500/46 = 0.430V

Any idea?
 
A

ajdoc

Member
PRAM reset did not help. Display is not detected and thats has been tested with original cracked screen and good known display. PRAM reset every time. Checked with new LCD flex cable as well.

Any idea?
 
Last edited:
A

ajdoc

Member
There is only very short spike just after chime. Multimeter is slow but it show spike around 4V (tested without display).
 
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