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Feint Screen issue on laptop

Posted on 2015-01-12
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Last Modified: 2015-01-14
I have a issue on a Sony Vaio laptop SVF1521A1EW

The screen was damaged and replaced but shows as black screen.  shining a torch onto screen shows that screen is working.  Normally I would suspect backlight or rectifier but as far as I can tell there is neither on the laptop as the screen is LED.

The existing screen was CHIMEI N156BGE-L41 Rev C1,  so suspecting an incorrect screen had been fitted I bought a brand new one.  This shows the same issue, black screen but shining a torch shows the windows  desktop.

The only thing I can think of now is that either the contacts on the screen cable have got dirty or the screen cable is faulty.  

Ive never seen a faulty graphics chip that shows a feint screen. Normally its just dead so I dont think its that, unless anyone else had experienced a faulty graphics chip causing this issue?

Anyone got any idea's?

Thanks in advance

G
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Question by:GRiTech
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☠ MASQ ☠ earned 2000 total points
ID: 40545363
Are you sure it's not an LCD screen with LED backlight on this model?
If you can see an image you're almost certainly missing rear lighting for the screen, either not connected or failed.

LED backlit screens have separate power for the LEDs in the ribbon cable but this is commonly damaged - particularly if the screen is removed while the battery is in place.  If you've a multimeter check the fuse to the LED power.

See: http://forum.notebookreview.com/sony/613996-no-backlight-led-screen.html
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by:GRiTech
ID: 40546547
OK thanks for that Ill check those points out.
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by:GRiTech
ID: 40546576
Sorry yes my bad description its an LCD screen with LED backlight.

N156BGE-LB1 Rev. C1 Laptop Screen Size is 15.6 inch WXGA laptop LCD screen with resolution of 1366 x 768 and backlight type of LED.
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Expert Comment

by:☠ MASQ ☠
ID: 40547145
I'm still guessing the power output from the motherboard to the LED backlight is what's failed here. Read through the (quite long) thread & you should then be able to short the connection where the fuse is on the Vaio and see if the LED comes back up.
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by:GRiTech
ID: 40547220
Yup thanks just been reading through the thread myself.  Ill get the multimeter on it to confirm and then if its blown see if there is a similar fuse on old screen.  Id rather replace fuse than bridge it.  Fuse must be their for a reason :-)  will update.
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by:GRiTech
ID: 40550272
Very helpfull, Ive not fixed it yet but got the board out and found the fuse N which appears to be blown as im getting no signal across it.  Just need to check if all backlight fuses are marked N. It seems to be the only 2a fuse on the board N being 2amp.

Thanks again
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