Toshiba Sattelite C655 LCD No image displayed

stadavis95 · 08-09-2011, 06:50 AM

Hi I have been having some trouble with my internal display for quite some time now. It started when my screen was stepped on and had to be replaced. I bought the replacement, but noticed that in the process of removing the video cable from the previous lcd, the video cable had been damaged. I then bought a new video cable. I have reconnected the new cable with the new lcd and I still get a blank screen. I reconnect the video cable to the old broken lcd screen and I still get nothing. The video works on an external monitor. The model numbers for both replacement parts are identical to the old parts. It seems like there is some sort of faulty wiring in the system but I don't have enough expertise to diagnose where it could be. If anyone has any suggestions, it would be much appreciated.

**oscer1** · 08-09-2011, 08:39 AM

hi Stadavis95, welcome to TSF

Can you see an image if you shine a powerful flashlight to the screen? have you made sure all the connections are fully inserted.

stadavis95 · 08-09-2011, 10:08 AM

It doesn't show an image when i shine a light in the back. Also i have reseated a few times and it didn't do a thing.

**oscer1** · 08-09-2011, 10:44 AM

maybe the inverter is bad. Or the new screen is defective .

stadavis95 · 08-09-2011, 11:09 AM

This model doesn't require an inverter. The LCD is brand new, so it shouldn't be defective. However, it is a different model number than the original (the original is TLAA, the new one is TLQB). I contacted the supplier about the mix-up and the supplier said that the TLAA is discontinued and the TLQB is the replacement screen.

stadavis95 · 08-09-2011, 01:05 PM

Also, I've noticed that sometimes it won't turn on at all. I'll disconnect the video cable and it still won't turn on. I'll also take the battery out and use the main supply and it still won't turn on, and vice versa.

**oscer1** · 08-09-2011, 01:09 PM

could be the power board for the led screen.

stadavis95 · 08-09-2011, 02:27 PM

Here are images of the video cable, the power board connected to the on/off switch, and the lcd screen. Are you referring to that power board?

GZ · 08-09-2011, 02:42 PM

Check the sockets on the motherboard and the LCD panel for obvious issues (bent/broken pins, etc).

Did you test the screen without reassembling it or did you assemble it fully?

stadavis95 · 08-10-2011, 06:21 AM

I looked at it thoroughly and couldn't find anything out of place. I have tested it fully assembled (short of putting in screws for bezel), as well as testing the screen with just the video cable plugged into the lcd. I haven't tested it removing components such as HDD, Memory, CD Drive, etc... I put in two new memory sticks (Crucial, 2x4GB) prior to this incident, and they didn't cause problems beforehand.

This might help: the first time I put in the LCD screen, the power went on then immediately shut off. This was with the old video cable.

stadavis95 · 08-10-2011, 02:59 PM

It won't turn on anymore or charge. No lights come up or anything. I took the motherboard out and checked the underside but there seems to be no visible damage. I've checked every connection for the lcd, power board, battery pins, charging cord, etc... Is there anyway I can test the connections using a voltmeter, or even use a voltage detector? I dont want to buy a new motherboard unless I'm completely sure that's the problem.

GZ · 08-10-2011, 03:18 PM

Black Screen Issues and Troubleshooting