LA76931S DATASHEET PDF

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Data IC LA Data Voltage PIN 1. SIF OUTPUT V PIN 2. IF AGC FILTER 0V PIN 3. SIF INPUT V PIN 4. FM FILTER V PIN 5. LA PIN 1= SIF OUTPUT [V DC] PIN 2= IF AGC FILTER PIN 3= SIF INPUT [V DC] PIN 4= FM FILTER PIN 5= FM OUTPUT [V~V] PIN 6= AUDIO. Part Number: LA Function: 64Pin LA for Color Television Receiver / SERVICE MANUAL. Maker: Unspecified Pinouts: LA

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The current in the base of V Ib also decreases simultaneously.

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. Please use a 0.

The phase of the signals, which are divided from chroma frequency and Snd-VCO frequency, will be compared together. The blanking output level of RGB is about 1.

LA Datasheet PDF – 64Pin IC for Color TV Receiver

Non-standard mode Standard mode: Whenever working on precision equipmentmake copious datasbeet and diagrams. That is two conditions, requiring two degrees of design freedom. This is the flat-top period of self – excitation pulse. The input impedance is about 50k and the DC voltage is biased at about 2.

The peak amplitude of base current and the way it is decreased determine the ultimate dissipation in the HOT and thus subject of heavy optimization. There are a semi-infinite number of variations on this basic theme.

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Do not start with the electronic test equipmentstart with some analytical thinking. Its pa76931s is therefore not critical. Thus the peak current in the winding will be quite high, resulting in a significant voltage drop when loaded. To improve the buzz characteristic, we recommend the application circuit as below: When the secondary load increase, also the magnetisation current will increase.

Besides, this pin become input pin of chrome signal in S-VHS mode. If this is present on the focus or screen traces or wires, it many just be your problem. There will be always be: Think of it this way: At the end of scan ,current is flowing through the flyback primary to the HOT, V We mainly check the open-circuit fault in horizontal deflection circuit.

Of coursecomponent values would need to be changed to provide the proper resonant circuit behavior. Do not work when you are really tired lx76931s it is both dangerous and mostly non-productive or possibly destructive. This reduces the scanning speed near the edges. We begin our adventure at the end of the scan-retrace-when the Primary flyback period begins: However, there could be several interrelated problems if a comon supply voltage were missing, for example, if it la7693s1 a knob, then it should be varying the control grid voltage relative to the cathodes of the CRT, this is not likely to be a very complex circuit.

For example, if the Vcc is 5V, it is 3V.

These cannot be applied easily with such a configuration. In the other hand, the time constant of APC loop is determined by the capacitor C1 and the internal resistor inside IC. There are several reasons including: This is called anti-breathing. Check the control itself for proper operation with an ohmmeter.

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LA76931 Datasheet PDF

C If there were no damper diode D1this voltage would go negative and continue to oscillate as a damped sinusoid due to the resonant circuit formed by T and C,C and the other components However ,D1 turns on as the voltage negative and diverts the current through it clamping the voltage near0 -Vf for datwsheet diodes.

The output circuit is a voltage follower. If you do not have a schematic, I would start by tracing from the control, check continuity and solder connections. The value of C1 is depending on the speed of AGC, lla76931s etc, and the recommend value is about 0. You can play similar games with datashfet voltage. If your TV has some kind of automatic picture modetry turning if off and adjusting the color control.

(PDF) LA76931 Datasheet download

It is amazing darasheet many complaints ka76931s out to be impossible to reproduce or are simple cockpit error. When the scan begins, the yoke current is at the maximum value it the direction to charge the S-cap. The scenario described below is only true in the steady state- the first few scans are different because the picture tube capacitance is still discharged. But no more adjustment of horizontal frequency is needed in the mass-production products. I Discharge 16 Mylar capacitor 1K 0.

From tuner 64 SAW 3.