LCD suddenly stopped working during use.

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2009年中 MacBook Pro 13" 一体化机

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Deeba Yavrom @deebayavrom

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发帖于: 2013年4月24日

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LCD suddenly stopped working during use.

Hi

So i was using my Macbook pro, mid 2009 13in model and all of a sudden the screen died on me. No real warning, no colored lines to prepare me, just shut off.

Now the computer runs fine, and will connect and show via external display, BUT the computer will not recognize its own display, it just shows the external. Also the apple logo doesnt light up on the computer either

I bought a new LCD screen thinking the LCD just died, but it wasnt it and still doesnt work Now I am at a bit of a loss as to what it should be. Maybe the connectors? Did a fuse blow? The connectors themselves look fine physically, but I dont know if they could be it

Any advice would be greatly appreciated.

Thank you

ok new updates! it wasnt the LVDS cable...I installed the new one and that didn't fix the backlight issue. so a new LCD and LVDS cable are out! Got a multimeter and checked the fuse mentioned by OT and it gave me a reading of 30.1 on the 2000k ohms dial. Im not a big electrical guy but from my understanding that means that the fuse is functioning. if I am right, does that mean it is the wled driver then?

i did a long google search for a wled driver repair and found this video...do I follow this? https://www.youtube.com/watch?v=SVdQ-2nj...

I have a friend that is skilled at this type of soldering, I just dont know where to find the part. ebay was no luck.

thank you all again so much!!

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Yes, there is a fuse on the logic board, but you could had other issues here. Can you give us the last three digits of your serial number so we can correctly identify your system.

由 Dan 完成的 2013年4月24日

Do you get video onscreen but no lightning or nothing at all ?

由 lemerise 完成的 2013年4月25日

Hi,

I get nothing at all. I can connect to an external display just fine, but even there the computer doesnt recognize its own LCD.

And the serial digits are 366E. Let me know if there is anything else I can offer

Thank you

由 Deeba Yavrom 完成的 2013年4月25日

Deeba Yavrom, do these specs look like your computers:" 2.53 GHz Core 2 Duo (P8700)

Intro Date: June 8, 2009 Disc Date: April 13, 2010

Order No: MB991LL/A Model No: A1278 (EMC 2326*)

Subfamily: Mid-2009 13" Model ID: MacBookPro5,5

Std RAM: 4 GB Std VRAM: 256 MB

Std Storage: 250 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"

由 oldturkey03 完成的 2013年4月26日

OT - I changed the icon to the correct one.

由 mayer 完成的 2013年4月26日

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oldturkey03 @oldturkey03

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Deeba Yavrom, this is not a real answer, but I did this so as to post an image with it. Try to angle a light source i.e. a flashlight against the display. Just to ensure it is not just your backlight that is out. It may give you the impression that the screen is not showing anything. I think the key for this is the dark Apple Logo. The illuminated Apple is lit by the LCD backlight. This of course does not exclude the LVDS cable, but also does not rule out a damaged fuse or WLED driver. How handy are you with a multimeter to check some of the components? Check the fuse for continuity and see what you get. Cheapest way and easiest would be to start off with a new cable. Usual disclaimer is that I am not a Mac person, but I think I am starting to get the hang of it :-) the real experts here are Mayer, lemerise and Dan.

Here is the schematic for the MOSFET in the backlight circuitry

and here is the location of the MOSFET

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hey oldturkey03. great advice! ...i did put a light the screen and do see the video input, obviously it is very very dark though. i really had no idea so I am glad you mentioned that tip! I will test the fuse tomorrow, meanwhile the LVDS cable should arrive on Tuesday for me to replace that. if it isnt the cable, it must be the fuse then yeah?

由 Deeba Yavrom 完成的 2013年4月26日

It could be the fuse, or the WLED driver (which would be a royal PITA) to fix.

由 oldturkey03 完成的 2013年4月27日

If there was no liquid involved in the issue it would be surprising that the backlight fuse could be blown. In this case the screen panel could be faulty but it's a good trouble step to check the fuse first. @oldturkey....you're surely qualified as one of the experts on this forum :-)

由 lemerise 完成的 2013年4月27日

I agree on both points with Lemerise - Fuses don't go unless something shorted and OT you're selling your sell short here ;-} You know your stuff!

由 Dan 完成的 2013年4月28日

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Yes, there is a fuse on the logic board, but you could had other issues here. Can you give us the last three digits of your serial number so we can correctly identify your system. — Dan
Do you get video onscreen but no lightning or nothing at all ? — lemerise
Hi,

I get nothing at all. I can connect to an external display just fine, but even there the computer doesnt recognize its own LCD.

And the serial digits are 366E. Let me know if there is anything else I can offer

Thank you — Deeba Yavrom
Deeba Yavrom, do these specs look like your computers:" 2.53 GHz Core 2 Duo (P8700)

Intro Date: June 8, 2009 Disc Date: April 13, 2010

Order No: MB991LL/A Model No: A1278 (EMC 2326*)

Subfamily: Mid-2009 13" Model ID: MacBookPro5,5

Std RAM: 4 GB Std VRAM: 256 MB

Std Storage: 250 GB (5400 RPM) Std Optical: 8X DL "SuperDrive" — oldturkey03
hey oldturkey03. great advice! ...i did put a light the screen and do see the video input, obviously it is very very dark though. i really had no idea so I am glad you mentioned that tip! I will test the fuse tomorrow, meanwhile the LVDS cable should arrive on Tuesday for me to replace that. if it isnt the cable, it must be the fuse then yeah? — Deeba Yavrom
It could be the fuse, or the WLED driver (which would be a royal PITA) to fix. — oldturkey03
If there was no liquid involved in the issue it would be surprising that the backlight fuse could be blown. In this case the screen panel could be faulty but it's a good trouble step to check the fuse first. @oldturkey....you're surely qualified as one of the experts on this forum :-) — lemerise
I agree on both points with Lemerise - Fuses don't go unless something shorted and OT you're selling your sell short here ;-} You know your stuff! — Dan