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1 No backlight, but display is working fine.
Hi all,
Please help me to get this backlight issue fixed.
Yesterday i was cleaning my MBP 13" retina A1502 model and unfortunately i forgot to remove the battery power. While the board still in power ,i accidentally removed the Display flex cable. After i assembled the Display the backlight is not coming UP, Apple logo on back lid is also not lighting, but when i flash a bright light on display i could still see the login page barely. seems everything else working fine, only backlight is not coming UP.
please help me to get it fixed , as the apple is demanding for board replacement which is much expensive for me to spend, also i lost my warranty just 3 months back.
Any help would be much appreciated , thanks
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Puan
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1 
6 Yorum
Use compressed air to blow out the connector carefully and try to look in side the connector with a magnify glass see if you seen any damage, you should see black with rows of gold pins not touching each other. Check the cable too for burn marks or debris and also the components around the displayport itself.
Is your keyboard backlight on ? Also next time start holding CMD+Option+P+R
John tarafından
Thanks John, I will use a blower to clean the socket and cable pins. yes , the keyboard backlight is working fine. But i figured out one thing that the display cable at logic board connector side has a tiny plastic edge is broken on right end side and the right-last pin i guess pin 30 seems hanging on without plastic guard. but still able to put into the connector without problem. Will this make any short in display electronics or would be fine? becox i still see the display showing login page without backlight. i also tried the CMD+Option+P+R but no change.
Selvam tarafından
Also FYI...i can able to work on external display through HDMI port with no issues. I see other posts saying F7700 fuse may be damaged.. should i look into that directly or it can be solved without replace the fuse .. pls help ~~~
Selvam tarafından
You could start with checking fuse see this answer
Where is the location of the back light fuse 820-3476-a?
I would need to see a picture of the display port connector before I commented on the corner part it's possible it could have caused short.
John tarafından
Hi john, I checked the connector there is no short. I only read 4.5 volt on pin 1 display cable., pls help me to locate L8300 so I can check voltage level also how to check if the lcd display driver chip is ok or not what voltage I should read and pin diagram for that chip. Can I check F7700 fuse status while stil soldered on board, pls help my backlight is not light up after I removed the display cable while still system ON. Sorry !! pls help
Selvam tarafından
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