Issue with T22 screen and a line bleeding down the screen

Message

kaotic504 · #1 Post by **kaotic504** » Sat Mar 04, 2006 1:42 am

Ok, so i have a T22 and i love it. it was my first IBM laptop and it's solid as heck and it's been wonderful to me *knock on wood*. But, my gf dropped it one day and ever since then, there's been a red line going down the far left hand side of my screen. it runs from top to bottom, and if you adjust the lcd, it changes color but most of the time, it's red. i've tried to take the laptop apart and re-seat the connector to the mainboard several times, but no improvement, should i just buy another LCD? any help is appreciated. thanks!

Website · #2 Post by **tfflivemb2** » Sat Mar 04, 2006 9:43 am

You could try removing the bezel over the LCD, and see if the inverter or the inverter-LCD cable is loose.

kaotic504 · #3 Post by **kaotic504** » Sat Mar 04, 2006 12:56 pm

hey, thanks for the suggestion. i've actually already tried that though. i took apart the whole lcd and reconnected EVERYTHING just to make sure it was straight and i saw no improvement

Thanks, i appreciate the response though.

Website · #4 Post by **tfflivemb2** » Sat Mar 04, 2006 1:13 pm

Ok, then you will most liekly have to replace the LCD.

Although, you could try replacing the inverter first, as it is significantly cheaper, just in case it is only the inverter. Worse case, you replace the inverter and still have to buy the LCD. Better than buying the LCD and then finding out that it was only the inverter.

beeblebrox · #5 Post by **beeblebrox** » Sat Mar 04, 2006 4:37 pm

Beware, these are some generic (recommendations) about the inverter.

Is has nothing to do with it. The inverter only does regulate the voltage for the background lamp.

your vertical line is either
a.) a memory error in the graphics chip
b.) bad connector on the LCD electronics (see backside)
c.) a stuck transistor in the vertical line electronics driver

Run a few tests for the graphics chip to see where the problem might be. You can also try to "massage" the stuck transistor by applying 0-1 transitions (different full screen colors). It sometimes helps to decharge the transistor.

But, unfortunately, your LCD might deteriorate over time.
I had the problem several times with the lines. Working on a,b,c (above) helped in 80% of the time.

kaotic504 · #6 Post by **kaotic504** » Sat Mar 04, 2006 5:59 pm

i'm definitely going to try your suggestions. do you have a certain utility that you suggest to test the graphics chip? i'll do 1 last disconnet and reconnect of the wires/flat ribbons. do you know of something that let me just display 1 color on the screen? thanks, i appreciate it.

beeblebrox wrote:Beware, these are some generic (recommendations) about the inverter.

Is has nothing to do with it. The inverter only does regulate the voltage for the background lamp.

your vertical line is either
a.) a memory error in the graphics chip
b.) bad connector on the LCD electronics (see backside)
c.) a stuck transistor in the vertical line electronics driver

Run a few tests for the graphics chip to see where the problem might be. You can also try to "massage" the stuck transistor by applying 0-1 transitions (different full screen colors). It sometimes helps to decharge the transistor.

But, unfortunately, your LCD might deteriorate over time.
I had the problem several times with the lines. Working on a,b,c (above) helped in 80% of the time.

#7 Post by **Kyocera** » Sat Mar 04, 2006 10:51 pm

I don't believe it is as cut and dried as beeblebrox makes it sound, here is some other examples from a google search:

1 Those with LCD's failures (white screen or red screen) Example:- Dell 8100 backlight if red will cause the inverter to go into self protect-switching itself off.
2 Intermittent and completely dead component failures, Could be the flex data cable
3 Liquid spillage = blurred screen with whitish blurred blotches.
4 Dim or Faint LCD,s (backlight out) or Red or orange display tint, will need backlight replacement, will refit LCD panel with NEW backlight in your LCD (extremely delicate operation) we found lamps (CCFL) cracked form heat or shattered form shock or Hiss from open circuit solder joints.
5 Transistor open & short circuits, burnt out inverter HV transformers or unraveled flex data connector or cables. SEE <-
6 Blank screen = Bad bulb CCFL (red screen) = cathodes brown = Lamp burnt.
7 Faulty display = dry solder joints or static damage to I.C.
8 No Light= Bad inverter N MOSFET or faulty oscillator or Burnt out secondary winding.
9 Missing individual lines on a display driver = pressure applied to edges of LCD normally better to replace A.C.Film is lose
10 Blank display. Missing a block of lines, or a bar. Normally better to replace bad flex circuit on substrate

Website · #8 Post by **tfflivemb2** » Sun Mar 05, 2006 12:26 am

beeblebrox wrote:Beware, these are some generic (recommendations) about the inverter.

Is has nothing to do with it. The inverter only does regulate the voltage for the background lamp.

If this were not a dropped system, I would agree with you. I normally follow the philosophy that either the inverter works or it doesn't (ie. power to the CCFL).

HOWEVER, I had a Compaq 7400 that I worked on (Lines on LCD) after being dropped. The problem was caused with the connection with the inverter. Once I replaced the inverter, the problem ceased to exist.

Initially, I thought that the problem was the LCD only. However, I had a spare LCD, replaced it and had the same problem. I have learned that many "rules" of the road seem to fly out the window when it comes to computer repairs.

Issue with T22 screen and a line bleeding down the screen

Issue with T22 screen and a line bleeding down the screen

Who is online