Hello friends:

I have laptop IBM ThinkPad 1200 i Series. Months ago the screen was broken, but I have bought a new LCD in ebay. I have installed it, but when on the laptop, the LCD shows vertical lines in RGB colours (see the picture attached).

The first image when ON the laptop is the IBM logo, I say this because this logo is in 3 colors (red, green, blue), and the vertical lines showed are also in these three colors. The laptop runs Windows 98, but that vertical lines is still, no changes does in the screen.

When I off the laptop and ON new, show the same lines but in another order. Shows in random positions and random colors every time, but the problem is the same.

The laptop work fine with external monitor.

Has been damaged the integrated VGA of the motherboard?, Can be the memory?..., please help!!!

Thanks.

Hello nizzy1115:

Thanks for your reply!!

I'm going to explain to you what I have done in these last days...

1) I have bought other new LCD, I have installed it and everything follows equal. Now I have two LCD's for this laptop, therefore, we can to discard that it can be a failure in the LCD.

2) I have verified the LCD ribbon cable, I have dissasembled the shield plates in both connectors (LCD and Motherboard) and I test it with an multimeter and all tests pin to pin is OK. Also I have verified the continuity with the connectors (in case some connector of the cable could be bad) and all is OK. We can to discard that the problem can be a failure of LCD ribbon cable.

The failure only can be in two sites:

- Can be that the motherboard connector of the ribbon LCD cable does not fit well with the connector of the motherboard. It would be rare because the connector goes plugged with two screws, but we cannot discard that the failure comes from here.

OR

- Can be the "Chip-Driver" of the VGA integrated in the motherboard. Some techs says to me that if the laptop work good with an external monitor, can't be of the Chip Driver (my laptop works good with an external monitor)..., but I'm not sure, because RGB out is different to LCD controller unless both controllers are in the same chip, in this case if the chip failures, will not work with an external monitor.

Any idea to continue verifying nizzy1115?.

Thanks!!!!

Ok i agree with the techs about the chip drivers i am 99% sure that they are the same controler...your gpu is probably fine but a connector from it to your lcd screen is somewhere most likely messed up...there are usually 2 cables going to the screen from the gpu ive seen a few different setups. i would open up the computer and get to the gpu and check those cables....this is a weird situation, as you have some display but its not correct and ive never seen anything like it before. are you sure you ordered the correct lcd screen for your computer? if your lcd broke from a fall this could deffinatly be it, or did it jsut stop working and go black? ill try and think of somemore possibilities if reseeding the gpu cables dosent work. Good luck!

Hello new nizzy1115:

Well..., cable is OK, contacts between connectors is OK, but nothing shows in the screen :-|

I don't know that I can verify now. Is very very rare that when I was fixed the pin in the connector (and with it the contact is ok) now the screen is lighted black. I don't understand it.

The laptop continues viewing well with an external monitor.

Any other possibility for verify nizzy?.

Thanks.

this case is weird...im almost at a loss, is there anyway you can get new connectors? you said one pin was stuck in the connector maybe something else is damaged in it (its possible i guess), otherwise im really not sure. Anybody else got any ideas?

this case is weird...im almost at a loss, is there anyway you can get new connectors? you said one pin was stuck in the connector maybe something else is damaged in it (its possible i guess), otherwise im really not sure. Anybody else got any ideas?