The shrinked screen with two white vertical line in the middle
When i turn on my monitor its ok first but after a while (15 min) the screen shrinke from all the corners like when squeeze the bread in the middle part and there is two white vertical line in the middle of the screen.
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it is possible that the monitor has a power crunch as a lower voltage gives out a shrinking picture. also it is possible that the deflection circuit or the vertical circuit, the vertical driver IC or section is faulty.
You can remove power and check for dry soldering, measure the power supply to confirm.
The DB15VGA (Video Graphics Array) connector contains however 15 pins in three rows of 5 pins each. These five pins carry the color and synchronisation signals, also a digital I2C interface for two-way communication between the video controller and monitor. The common 15-pin VGA connector found on most video cards, computer monitors, high definition televisions which support VGA connections. The following schematic diagram and table shows respectively connector and pin assignment of DB15VGA. Pin Name Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 RED GREEN BLUE n/c GND RED_RTN GREEN_RTN BLUE_RTN VDC GND n/c SDA HSYNC VSYNC SLC Red Video Green Video Blue Video not connected Signal Ground Red Ground Green Ground Blue Ground 5 VDC supply (fused) Signal Ground not connected DDC/I2C data Horizontal Sycn Vertical Sycn DDC/I2C Clock
click the menu butten on your monitor and click positioning and they it should be under horizontal and vertical but if its on the sides click horizontal and use the plus and minus buttens on your monitor to adjust it.
first of all , it could be a solder problem try resoldering taking care do not leave any shorts circuits por ahi,may be a shorted coil, you have to test them all,look for a shorted diode esp. in de horizontal area.
if any of this things sounds rare, leave it to the repairman!
I know I have seen thin lines in the past on older CRT monitors, these are usually wires which support the aperture grill.
LCD is just a panel so this must be something different. What color is the line? It is probably an error in the scanning process.