LCD screen red shadow

[pulpp]

hi, i have anotebook where the LCD screen suddenly started sorta of turning red as well as getting less bright, i am guess the its something with the lcd backlight, is there is any way i can fix this myself?

thanks

 

[tlemmon]

You probably have a broken wire going from the video card to the LCD screen. I was a laptop tech with NEC and have seen this many times. If you move the screen back and forth, does the color change? What if you press down on the laptop near the base of the LCD screen? Personally I would dissamble the laptop top find out, but I doubt most people are that brave. Do you get all of your colors fine when you plug an external monitor into the back? If so, then that would seem to indicate the Video card/chip is ok and that is likely just a wire. LCD's dont just lose one color like a monitor. With a monitor you have 3 color guns. With an LCD you have transistors. If a transistor went out, you would get a dead pixel. This would look like a Black, Green, Blue or Red dot. I think its a wire, and if that is the case you would need to have the manufacturer of the laptop fix it for you. I am sure they will just swap out the LCD assembly (including the wiring harness for the LCD, and its expensive if you are out of warranty!!) and call it good.

Good luck!


-t

 

[pulpp]

yes exactly as you say man, when i move it or shake it alittle sometimes the redness goes away then comes back, and i have no dead pixels. i have no external monitor here, but i will take it to a friend house and try. i did open up this laptop before and since its outta of warrenty anyway, i will give it a try, mayeb i can fix it myself...


thanks alot man

 

[tlemmon]

You might need to pop the back of the LCD screen off as well so you can get to the wires in there. What I would do is leave the system on and have the LCD in its red state. Then, very carefully bridge each wire until I find which wire it is that produces the red tint. Let?s say there is a Red wire (one of many that will connect to your LCD). Place a new wire at one end of the Red wire, and the other end of your test wire where the Red wire ends. This effectively creates a new path for the signal to follow. If that doesn?t fix anything, move onto each wire until you find the one that does. You will need to check the LCD each time to make sure you found the correct wire. If you are adventurous enough, just find some wire of the same gauge at your local electronics wholesaler (not Radio Shack) and replace all of the wires. Just make sure the new wire is extremely flexible due to you opening and closing the lid on your laptop. This would help just in case there is more than one wire that is broken. You will likely have 12 or more wires. If this does not produce any results then it is likely you have a broken solder joint on the circuit board where these wires plug into. I don?t know how brave you want to be there. I know with the NEC notebooks I used to work on there was a small riser board off of the motherboard that our LCDs would plug into. Over time this board would wiggle loose and simply popping off one panel and pressing down on it would fix it. Maybe you will be that lucky!

If you are unsure of what you are doing, I would recommend that you don?t do it! You can always have the manufacturer fix it for you.

Good luck!


-t