He is talking about the screw on the flyback. It is on the high voltage part of the circuity. I resell monitors and computers and I have to take off the back to get to this. I would not recommend it to a novice. This will light up your life. When you turn it up too much you get those scan lines across the screens. To find the fly back look for the heavy plastic thick thing on the circuit board to the back away from the picture tube. I had one of these on a samsung tv that looked like an arc welder. It is best to leave it unplugged for 48 hours for the electricity to discharge.
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Possible failure of the screen control potentiometer which is found near the line output transformer( fly back -LOT).
Make sure that there is no loose connections on the CRT , failure of passive components ( resistor, capacitor) int he CRT also can bring about low brightness.
Check the grid voltages, the damper capacitors to the GRID must also be measured.
Sounds like a dry joint or a dirty control.
In either case, its probably a case off job.. You need to consider this carefully as you are dealing with potentially voltages up to 30,000V. In all honesty, you may be better off going to your local Thrift Storel where they often have screens for under $10.
Before you take the screen apart, look on the back for a couple of holes close together with one marked FOCUS. The other MAY be marked Brightness or SCREEN.
with a longish NON METALIC screwdriver, turn the recessed control gently in the SCREEN hole slightly one way, then the other and then back to its original position. This may remove any dirt/dust accumilation.
I CANNOT STRESS enough, the need for EXTREAM care here due to the VERY HIGH Voltages involved.
Usual disclaimers apply..
Best take it to a shop or replace it..
If the backlight lights up for a second it's probably fine - It lay odds on the display inverter in the screen. Actually finding parts for anything made by gateway may be difficult, however. They do not sell spare parts. Considering the size of the LCD i bet it would almost exceed the replacement cost of the screen to repair it