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There is necessary to use a coupling capacitor to combine with it. This is called the average beam current limiter. In addition, the improved operation of gain control and gating control in this IC contribute to stabilize horizontal output of VCR signal in automatic mode.

For understanding the working fatasheet the deflection circuit regard the flyback transformer as a inductor. This is called anti-breathing. It would still be a sawtooth as described above.

There daasheet several reasons including: It is called Signal-input way. Above steps have accomplished the flyback function of quicky and cleanly reversing the current in T and ,as we will see,the deflection yoke as well.

The most effort goes into the optimization of the magnitude of the base current. This makes it extra difficult to optimize the base-drive because there is only a limited time interval where the HOT may be switch on and that interval is shorter with high beam current load. The recommend value of this capacitor is 1uF.

LA76931 7N-58G1

Realize the coincidences do happen but are relatively rare. One possibility is that glue used to hold components down on some circuit boards datasheett deteriorated and turned conductive. When we add in the joke components only the horizontal deflection coil and S-correction capacitor or S-cap are actually shown above conditions are only slightly more complex: There may be diodes in places you would think would be impossible.


The advantage of a flyback rectifier is that it provides 7 times more volts per winding than a scan rectifier. With a basic understanding of how the equipment works, many problems can be dealt without a schematic. This means that also the switch -on moment of the HOT will vary with the load.

In the other hand, the time constant of APC loop is determined by the capacitor C1 and the internal resistor inside IC. But, it is possible that the output of IF signal or noise signal of IF circuit may interfere the video signal in some expected conditions. This pin is selected at C. Chapter Two Dwtasheet Deflection. This make the current between pin3 and pin7 of T51 1 to decease.

(PDF) LA76931 Datasheet download

Failures – usually shorted diodes-are common. The answer is a definitive NO. Do not care Output the color system of IC which is operating. The maximum input for this pin is 96dBu. It is connected with the base of V and controls the degree that V turns on. It probable causes flashover and smoking inside the set. The diverse current flow dztasheet pin1 of T via R Your frequency counter may be double triggering due datasbeet noise or imperfect signal shape.

And the DC output of this pin is about 2. A stable synchronization signal can be achieved because it is not interfered by the external vertical trigger. Without special measures, brighter pictures will be larger.

Then the test functions below will take active. There are 3 freedoms: Thus the peak current in the winding will be quite high, resulting in a significant voltage drop when loaded. The flyback rectifiers esp. And it is also possible to decrease the FM detection level by connecting a resister serially with pin 4. Some possibilities in no particular order: Ultimately this will cause saturation of the ferrite core.


By simply putting a capacitor in series with each coil, the sawtooth waveform is modified into a slightly sine-wave shape the top and bottom are somewhat squashed. One arrives the collector of V through pin3 and pin7 of T, the other arrives the base of V through startup resistance R, R,Rlimiting resistor R This is the flat-top period of self – excitation pulse.

The horizontal Part of T deflection yoke, damper diodeHot collector, snubber HV capacitor s ,and flyback primary all Flyback connect to the same point.

LA Datasheet PDF

Safety first – know the hazards associated with the equipment you are troubleshooting. If you do not have a schematic, I would start by tracing from the control, check continuity and solder connections. Ug charge C reversely. This same principle applies at the electronic. Try to remember that the problems with the most catastrophic impact on operation- a dead TV usually have the simplest solutions. You can play similar games with focus voltage.

Check for tan to brown stuff shorting traces on the CRT neck board. Note that to the average person, the obvious question becomes: This is a balanced input and it needs a 0. Therefore, the design of FBP input circuit adjustment of horizontal phase, jitter characteristic etc become more easier.

At the beginning of scanthe damper diode forward biased carries the bulk of the current from the yoke and flyback.