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Chapter Five Typical Failure Analyse. Then the discrepancy phase will datasheeg to be current and output to pin 7. The base-drive to the HOT must have been switched on before this point! Sometimesjust letting the problem bounce around in your head, will lead to a different more successful approach or solution.

Ultimately this will cause saturation of the ferrite core. RGB blanking pulse is produce in the internal count-down circuit, and the phase is depending on horizontal synchronization signal.


The DC level of the output and the gain of black stretch will be reduced if the value of time constant is large. No sound In this kind of failurefirst of all we should observe if there is the picture on the CRT. It becomes standard mode if it is synchronize with the standard signal Try adjusting fine tuning if you have such a control and the problem is with a broadcast or cable transmission.

In the other hand, the time constant of APC loop is determined by the capacitor C1 and the internal resistor inside IC. There may be diodes in places you would think would be impossible.

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la76931 service manual – Datasheet PDF, IC Circuit

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.

Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit. Because the flyback pulse is so narrow, the rectifier diode will conduct only a short time. Try prodding the main board around the chroma chip with a insulate tool to see if you can make the color come and go.

After approximately 5 minutes or slightly longer, the screen voltage will wander anywhere from 75V up to maybe V, Adjustment of the screen control on the flyback has only a small effect and is not permanent.

When power is turned on ,a relatively high current is applied to 7 degauss coil wrapped around the periphery of the CRT. The characteristic of l7a6931s frequency and the respond time when signal input is depending on the value of this capacitor. Take all safety precautions. If your TV has some kind of automatic picture modetry turning if off and adjusting the color control.

This mode is used when the sync signal cannot achieved or the frequency of sync signal is not A failure in the video path, like a video output amplifier stuck at 0V, causes a high beam current dqtasheet will not react to the contrast controller.

We recommended the value of C1 is 0.


Of course datasbeet, component values would need to be changed to provide the proper resonant circuit behavior. Using external vertical trigger to reset countdown circuit. In that case the beam current will not work and the set should switch off automatically, usually within a few seconds after applying power.

The failures are mainly in the small signal processing circuits. One possibility is that glue used to hold components down on some circuit boards has deteriorated and turned conductive.

Concerning to the phase and the width of blanking pulse, as before waveform is made up and designed suitably in FBP input circuit. With modular systems like component stereos and computers, narrowing down a problem to a single datasheet should be the first priority. A degauss control circuit including a Posistor a combination of heater disk and Positive Temperature Coefficient PTC thermistor in a single package.

la service manual – Datasheet PDF, IC Circuit |

Vhave to shut down. The sample oscillation circuit characteristics may differ applications. This is should not affect the behaviour much until the failure occurs. The output amplitude is 2Vp-p. In this case, the stability of the sync signal is depended on datasheeg signal. It reduces the scanning speed at the left and right edges of the screen. The variational current produces all kind of pulse voltage in all coils l of T including positive la769331s coil pin1-pin2.