Troubleshooting Horizontal Deflection Circuits
As a Monitor repairer, the most frustated moment was troubleshooting horizontal deflection circuits. However, once you know how this horizontal deflection circuits work, it is just like any other electronic circuit. I still could recalled when i just joint the Monitor repair line, I don’t have any ideas on how to troubleshoot power supply circuit. As time go by and have the heart to learn, nothing cannot stop you from achieving the knowledge that you want to acquire. This same goes to the horizontal deflection circuits, it consists of flyback transformer, damper diode, hold down (safety) safety capacitors, horizontal output transistor (HOT), CRT yoke coils and all the surrounding components.
If one of these circuit breakdown, the Monitor will experience power blink, no power, arcing sound, power cycling, burnt smell and etc. You have to have your own procedure to solve this circuit problem. The first step is to begin to check on the HOT, then the flyback transformer internal capacitor, flyback primary winding, CRT horizontal yoke coil and etc. I suggest you to compare with a known good Monitor first for taking down all the necessary voltage and ohms test point. Once you grasped the techniques of troubleshooting horizontal deflection circuits, repairing other circuits would be very much easy.