820 5482 a - spin, chime, but no picture

As per title, no visible damage, no liquid residue, nothing that I could see.
Tried with an external screen via HDMI and couldn't get a picture either,
Please assist
Thank you in advance!
USB seems to work, I actually had a screen come up for a few seconds, showing the login screen and suddenly went black with all else seemingly still on


Staff member
Missing image and backlight at same time?
Do you get voltage at pins 5 and 28-30 of J8300, at least in the first few seconds (when chimes)?


Staff member
Check voltage at pins 28-30 in the first few seconds (when chimes).
Be sure L8300 is good.
Also check LCD_PWR_EN and LCD_5V_EN in the first few seconds.
pins 28-30 nothing during during chime
LCD_5V_EN 0v
measured during multiple boot cycles

L8300 under 1 ohm so its bad, I understand this happens due to screen connector short, anything I should check before replacing L8300?