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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This is called S-correction. Below are some functions which can be control by BUS: Audio SW 1 The switch of Int. For a TV, it may just be a bad connection or failed diode. B The flyback also generates the HV and secondary output voltages and the primary current might then be affected by these and change as a function of beam current picture brightness or audio level although feeding the datashedt amplifiers from LOT windings is not common anymore. The process is shown below: This make the current between pin3 and pin7 of T51 1 to decease.
The flow chart is as follows: Ka from the loudspeakers. The failures are mainly in the small signal processing circuits.
This mode is used when tuning or some unexpected conditions. Your frequency counter may be double triggering due to noise or imperfect signal shape.
Control video output amplitude. When the scan begins, the yoke current is at the maximum value it the direction to charge the S-cap.
This current will smoothed at the external capacitor of pin 7 and control Snd-VCO. This same principle applies at the electronic. This is the flat-top period of self – excitation pulse. One possibility is that glue used to hold components down on some circuit boards has deteriorated and turned conductive.
In all casethe power to the horizontal output transistor HOT of the horizontal deflection system is obtained directly from the DC voltage power supply. For example, if the Vcc is 5V, it is 3V. Decaying or erratic focus or screen G2 voltages The fellow applies to both CRT focus voltage which should be a few KV and screen or G2 voltage which should be several hundred V The screen voltage will come to normal after sitting over night.
Try to get as much information as possible about the problem from the owner. So the working condition of V can be controlled. If your TV has some kind of automatic picture modetry turning if off and adjusting the color control.
Because the flyback pulse is so narrow, the rectifier diode will conduct only a short time. The output circuit is a voltage follower. Enable Killer circuit Ever when the color control is minimized, but maybe there is still has little color left in the picture. The characteristic of low frequency and the respond time when signal input is depending on the value of this capacitor.
To improve the buzz characteristic, we recommend the application circuit as below: The value of C1 is depending on the speed of AGC, sag etc, and the recommend value is about 0.
It is called Signal-input way.
LA76931 Datasheet PDF
Take all safety precautions. 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. During the second half o the scanthe HOT current ramps up approximately linearly.
Learn from your mistake.
ELECTRONICS TRICKS AND TIPS: LA IC DATA SHEET
Every line transistor has its own requirements for: A typical driver la76931w may be in the Of coursecomponent values would need to be changed to provide the proper resonant circuit behavior. For further assistance, please contact with oscillator manufacturer with the following notes in your mind.
And the DC output of this pin is about 2.
Many problems associated with consumer electronic equipment do not require a schematic though one may be useful. 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.