Is this normal for the screen cable?

Question

Toshiba Satellite L655D-S5095

A multi-function laptop released in 2010 by Toshiba. Can be used for leisure, business, or education.

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RSiopa @rsiopa

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게시일: 2023년 2월 27일

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Is this normal for the screen cable?

My laptop's screen is always black even though when connected to a monitor, it shows image on the monitor. I tried various software fixes until I could not fix the black screen by software (to my knowledge), starting to try and look into the hardware.

After a bit of digging I didn't find anything out of the ordinary with the screen, only that the cable that connects it with the motherboard is missing one of the female pins' copper and the one on the back of it too.

Because of being relatively new to fixing computers, can someone tell me if this is normal? If it is not normal, am I able to fix it or should I just get a new cable?

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jayeff @jayeff 평판: 450.2k 11 367 1.4k · Answer 1 · 2023-02-27T07:19:38-07:00

Hi @rsiopa,

The missing #24 pin may be just because it wasn't necessary since it is not being used. There seems to be two distinct cables connected i.e. red/yellow/black wires which look like some sort of power supply and a video cable (sheathed, shielded cable)

Try shining a flashlight at an angle close to the laptop's screen and check if you can detect any images on the screen.

They will be very faint if they are there so trying this in a darkened room may help.

If you can see images then there's a backlight problem with the screen.

Either a faulty backlight power circuit (fuse? - check for a voltage <20V?) on pins 22 & 23 of the video cable connector, be careful that you don't short out the pins to the next pin with the meter test probe - see image below.) a faulty cable or cable connection (either end, motherboard or screen) or perhaps a faulty backlight circuit in the display.

Here's an image of the LCD connector wiring from a Toshiba L655D that may help

(click on image)

Toshiba Satellite L655D-S5095

Is this normal for the screen cable?

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