Aller au contenu principal

LCD becomes black at OS boot

Hello,

at power-up the LCD is white/gray with the Apple logo, then the loading logo (rotating circular segments). Then the display turns black. Everything works perfectly on an external display. I tried to change the LCD, the result is same.

What could be the problem ?

Thank you for your help.

Répondu ! Afficher la réponse J'ai le même problème

Cette question est-elle utile ?

Indice 0

Commentaires:

thank you Dan. No it doesn't help (I used the procedure with removal of the battery).

par

Ajouter un commentaire

1 solution

Solution retenue

Did you reset the SMC? its just possible the display setting is set at the lowest brightness setting. Heres the Apple TN on how to do it Resetting the System Management Controller (SMC)

Cette réponse a-t-elle été utile ?

Indice 1

Commentaires:

OK - Try this, after booting using the keyboard brightness buttons lower the brightness to the lowest setting. Then slowly raise it does it light up? Also if you use a flashlight though Apple logo can you see your desktop image?

par

No, both operations don't show anything.

By the way, here are the graphics properties (with the external monitor L72D connected):

GeForce 8600M GT:

Chipset Model: GeForce 8600M GT

Type: Display

Bus: PCIe

PCIe Lane Width: x8

VRAM (Total): 128 MB

Vendor: NVIDIA (0x10de)

Device ID: 0x0407

Revision ID: 0x00a1

ROM Revision: 3175

Displays:

Display Connector:

Status: No Display Connected

L72D DVI:

Resolution: 1280 x 1024

Depth: 32-Bit Color

Core Image: Hardware Accelerated

Main Display: Yes

Mirror: Off

Online: Yes

Quartz Extreme: Supported

Rotation: Supported

Thanks

par

If you don't see a ghost image of your desktop with the flashlight your LVDS cable or the display is bad. As you replaced the display (hopefully with the correct one) then the cable is likely bad.

par

That was also my reasoning: I checked the LVDS cable wire-by-wire, and its seemed OK. What puzzled me in the graphics properties is: "Display Connector: Status: No Display Connected", as if the LCD doesn't enumerate.

It is a correct one, it behaves exactly as the original.

par

Did you put the LVDS cable in upside down? If you did, you might have blown the fuse links (near the connector) marked with a letter 'P.

par

Voir 7 commentaires en plus

Ajouter un commentaire

Ajouter une réponse

TTR78 sera éternellement reconnaissant.
Nombre de vues :

Dernières 24 heures : 0

7 derniers jours : 0

30 derniers jours : 0

Total : 172