Question about AOC CRT Monitor
The monitor screen is working normally but the horizontal output transistor gets so hot it will fail in 10 minutes if the monitor is not shut down. What part is the most probable cause? Please help.
The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.
Posted on May 16, 2007
SOURCE: monitor problem
To do an internal repair on a CRT is beyond my level of expertise.
I would leave repairs like that to those that do know. I've heard too many horror stories about what can happen if you don't know your way around the inside of a CRT.
Posted on Aug 20, 2008
SOURCE: AOC 53N PROBLEM
DO YOU KNOW HOW TO SOLDER. IF SO, TRY TO OPEN THE MONITR AND LOCATE THE VERTICAL SECTION AND YOU WILL FIND LOOSE SOLDERS. A SINGLE HORIZONTAL LINE MEANS THAT THERE IS A PROBLEM WITH THE VERTICAL LINEARITY OF YOUR MONITOR. FIND SOMEONE WHO KNOWS HOW TO FIX COLD SOLDERS
Posted on Dec 19, 2008
Try to unplug the power cable from the mains for about 10 minutes then replug and try again.
Make sure all cables are well connected.
Try to test it on another computer if possible.
If that doesnt help then it sounds like a hardware problem with the monitor and you wont be able to repair it your self.
Posted on Jul 24, 2009
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