820-3476 Intermittent backlight

thetech

New member
Late 2013 13" 3476 board, backlight goes dim (can see video on LCD with flashlight) after 1-4 hours. Sometimes works fine for days on end. No sign of liquid damage.

Thoughts? I really don't want this thing on the bench for days on end.
 

2informaticos

Administrator
Staff member
Did you have original Magsafe 2 charger?
You need to measure some voltage on the backlight area.
Should be good to test known good LCD assembly first.
 

thetech

New member
Yes original charger.
Tested with new LCD, same problem.
Haven't checked backlight circuit voltages, don't want to put time into a potentially unrepairable problem and customer is considering purchasing a new one anyway.
 

MOMOH

New member
its definitely repairable, I would suggest you make some measurements when the backlight is not present , so we can first establish a state , Foe example , check for backlight output voltage , that will give you an idea of the circuit state , you should not give up on Backlight repairs, as its almost the easiest
 
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