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AOC 7Elr 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.

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SOURCE: Horizontal output transistor keeps failing

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: AOC color monitor model 9g1rs, dead, ** volt, fuse good

Hi
You need to replace HOT(Horizontal Output Transistor) see number carefully before you replace it.
Thanksdb1ed6d.gif

Posted on Mar 18, 2008

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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

  • 1 Answer

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

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SOURCE: My Monitor AOC CRT Model F1770 is always adjusting

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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You need to replace HOT(Horizontal Output Transistor) see number carefully before you replace it.
Thanksdb1ed6d.gif

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