Power off open tube socket carefully watched tube focus discharge Chamber burn one, between two metal plates attached to many of the charred black wire.

Failure analysis: Socket damaged mostly moister air entering the tube focus discharge Chamber, spark discharge for long time and gradually formed, causing slow TV poor focus, defocus, imaging, image, dark, and so on. Rare element damage is causing the boot directly burned tubes. Take on a genuine outlet for, I thought r, did not expect just one to boot, new outlet was burnt again, fault after all. I became aware of the grave quickly off carefully analysed.


Socket damage is done in an instant, my first impression of focus voltage abnormally high. Reason can cause focus voltage only following what time: 1 line voltage abnormally high. 2, line retrace capacitance is too small. 3, high pressure into focus voltage. Maintenance programmes are as follows: 1, first disconnect the power line circuit test line, line power supply is normal. 2, return capacitor smaller to bring increased focus voltage will cause an increase in voltage. Focus voltage measurements with reduced mobility, but depending on the voltages are easy to measure, depending on the voltage is measured by short boot, found that depending on the voltage, capacitance normal illustrated history. 3, after the two above exclude, it seems that problem must be in the article, high-pressure fleeing into way through ignition coil, CRT is nothing more than two components. First, replace the ignition coil, and secondly, under the pipe back Board, out of the picture tube. Short-time power, hoping that success, but symptoms are still. Maintenance and mess up, incapable for a moment.

After passing through the anxiety and confusion, stop and reflect on things. From fire "intensity" description components the extent of the damage is very serious failure points, followed by excessive focus voltage Basic, down is very narrow, ignores what the hell? Suddenly I thought of high-voltage discharge in air except related to the supply voltage, also related to the power supply frequency, can't focus voltage frequency changes? Focus voltage frequency depending on the frequency, so focus on measurement and frequency components. Components associated with the line frequency, C507, C508, R505, R506, R507. Carefully observed line frequency potentiometer R506 open, put on a new socket and line frequency potentiometer, and troubleshooting.

Special fault example of it can be seen from the top: 1, maintenance not too trusting of the first feeling, thinking it's easy to make into a dead end. 2, failure is a disease often is caused by incomplete or omission of thinking. To think carefully and thoroughly and carefully, I believe that all problems can be solved