LA76931S DATASHEET PDF

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 output circuit is a voltage follower. The horizontal Part of T deflection yoke, damper diodeHot collector, snubber HV capacitor s ,and flyback primary all Flyback connect to the same dayasheet.

The PTC thermister heats up, increase in resistanceand smoothly decrease to nearly zero over a couple of seconds.

LA Datasheet PDF – 64Pin IC for Color TV Receiver

There may be diodes in places you would think would be impossible. We all make mistakes – some of them can be quite costly. One possibility is that glue used to hold components down on some circuit boards has deteriorated and turned conductive. The dtasheet is to feed some EHT information or beam current information to the deflection circuits, reducing the deflection current xatasheet a bit for bright pictures.

Sometimesjust letting the problem bounce around in your head, will lead to a different more successful approach or solution. A resister is needed to connect with this pin from Vcc.

Min Each control variable range is show below: The final voltage regulated depends on V,V etc. The advantage of a flyback rectifier is that it provides 7 times more volts per winding than a scan rectifier. The flyback should largely not know the difference with the socket plugged into the CRT. With modular systems like component stereos and computers, narrowing down a problem to a single unit should be the first priority.

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datashest We recommended the value of C1 is 0. When power is turned on ,a relatively high current is applied to the degauss coil wrapped around the periphery of the CRT. A degauss control circuit including a Posistor a combination of heater disk and Positive Temperature Coefficient PTC thermistor in a single package. Note The duty of the horizontal output pulse is designed at W e can use the resistance function of an analog multimeterconnect the red pole negative in ohm scope on the circuit board groundthen touch softly the test point with another pole black laa76931s in ohm scope meanwhile observe the reactivity on the output device.

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

The switch on time more longerthe energy magnetic stored in T will be more stronger. In that case the beam current will dwtasheet work and the set should switch off automatically, usually within a few seconds after applying power.

Regulator is based on the above theory. If you get readings that do not make sense, you may be using your equipment in a way which is confusing it.

There are several reasons including: Take all safety precautions. This datashete should not affect the la6931s much until the failure occurs. It would still be a sawtooth as described above. Firstconfirm that the source is actually in color – try another channel or input device. There is an attenuator between input int.: If you get stucksleep on it.

Capacitor This pin connect la76931z capacitor, which is used to generate a ramp waveform for the reference of pin 17 Vertical Output. Without special measures, brighter pictures will be larger. Select pin 5 output. A failure in the video path, like a video output amplifier stuck at 0V, causes a high beam current that will not react to the contrast controller.

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LA76931 Datasheet PDF

Note that there is the possibility of damaging the known good part by putting it into a non-working device or vice versa. Ka from the loudspeakers.

The current in the base of V Ib also decreases simultaneously. Do not work when you are really tired – it is both dangerous and mostly non-productive or possibly destructive. Therefore, the design of FBP input circuit adjustment of horizontal phase, jitter characteristic etc become more easier. Whenever possible, try to substitute a working unit.

Adjustment has done for mass production products. This mode is used when the sync signal cannot achieved or the frequency of sync signal is not Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit.

A service manual will help greatly in attempting to troubleshoot this unless it is an obvious bad connection.

LA Datasheet –

It will undergo a linear increasing process. This mode is used when tuning or some unexpected conditions. This represents a short-circuit at the secondary side of the flyback. The flow chart is as follows: A stable synchronization signal can be achieved because it is not interfered by the external vertical trigger.

Repair any damaged traces. In the other hand, the time constant of APC loop is determined by the capacitor C1 and the internal resistor inside Ddatasheet.