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Hi, You have ruled out the graphics chip by plugging an external monitor in, the chips fine. Now you have to look at the inverter. Sometimes a cable will work itself loose from the inverter, causing the display to go wild and show strange colours where is should be white. What you have to do is remove the screen bezel (the plastic screen surround) this reveal the screen, look at the bottom of the screen for a thin circuit board with cables coming from it and make sure the cables a plugged in properly. If you need anymore help or advice please post back.
first try booting the laptop and pressing the Fn key with the numerical ( numbered key ) that has a picture of 2 screens on it. This is for booting to an external monitor. you could also try adding an external ( pc monitor ) this will eliminate any motherboard Faults.
Secondly, the graphics chip driver may be corrupt or not installed correctly. if you have a restore cd, you could try booting the laptop, with the cd in the drive.
you can then try, to see if the settings in the bios are all correct, by booting/starting the laptop and pressing esc or F2 or delete immediately as the laptop starts. ** Be-Careful** what you adjust.
My suggestion is to look for. ** default settings tab** or load setup defaults.
these are the obvious things to try, before assuming that you have a faulty graphics chip or motherboard fault.
This problem (known as sparkles) can be cured by adjusting the ramp control on the Y-Sustain board. If this does not cure the dots then there is a software remedy for the control board which an LG repair centre could fix. Failing that a replacement board is required. The orbitor & whitewash are like screen savers to help to prevent a screen burn from a permanently displayed image.
HI ,USE A PATTERN GENERATAR DOT OR LINES TYPE AND USE THE CONVERGANCE RINGS BEHIND THE YOKE OF THE SET ,THERE ARE THERE RINGS FOR EACH COLOUR RED GREEN AND RED .SLIGHTLY MOVE THE RINGS AND U CAN SE EIN THE PATTREN THE COCLOUS WHICH IS FRINGES EACH BY EACH U ADJUST ALL THERE RINGS FOR PERFECTION , FIRST LET THE SET BE SWITCHED ON FOR 1 HOUR AND THEN DO THE ADJUSTMENT. THANSKS
It could just be the drivers for the video card need to be reinstalled.
Pop over to the Toshiba website and you will find them in the download area.
Before you go there though, right click on the desktop and bring up the display properties. The card may have reverted back to a low colour bit setting. If so, set it back to 32bit and that should make it a happy camper again.
Hi, J !
You didn't say how old you set is, but to me it sounds like you may have a warped shadow mask in you picture tube.
A shadow mask could be compared to a piece of screen wire. It's function is to make the electron "beams" from the three electron guns strike the proper phosphor dot to produce the proper color- red-green-or blue.
If this is the case the picture tube would requie replacement.