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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With modular systems like component stereos and computers, narrowing down a problem to a single unit should be the first priority. In this processthe current variational ratio supports the constantly charge voltage.
Nextcheck the setting of the color control – it may have accidentally been turned down.
The value of C1 is depending on the speed of AGC, sag etc, and the recommend value is about 0. The flyback should largely not know the difference with the socket plugged into the CRT. This function can adjust the Over —shoot component of the Y signal.
Obviously ,when the reverse charge current is less than startup current, V will turn on again and finish another self-excitation oscillation.
But it needs adjustment at engineering sample stage. Sometimesjust letting the problem bounce around in your head, will lead to a different more successful approach or solution.
This risk datasjeet most likely with the power circuity in amplifiers, TV s and monitors, or low level circuits in VCRs.
la76931 service manual – Datasheet PDF, IC Circuit
The voltage on the S-cap is varying by just the right amount to compensate for the geometry error. The base-drive to the HOT must have been switched on before this point! This is a balanced input and it needs a 0. Then it will pass through a amplifier after the DC output is fixed. Enable Killer circuit Ever when the color control is minimized, la769311s maybe there is still has little color left in the picture.
This same principle applies at the electronic. While checking horizontal and vertical deflection circuit s failuredatasheeg have better to use an oscilloscope.
Do not work when you are really tired – it is both dangerous and mostly non-productive or possibly destructive. The characteristic of low frequency and the respond time when signal input is depending on the value of this capacitor.
The full flyback and yoke current are now flowing through the forward biased damper diode,D1. In TVit need switching typical power to provide stable DC.
LA Datasheet PDF
The datssheet effort goes into the optimization of the magnitude of the base current. This is called flat-bottom period or pulse interval. Here is another thing to try: 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.
You may see all sorts of additional passive components as well as transformers for generating additional voltages not provided by the flyback. The signal, which is peak detected by the AGC detector, is smoothed by the external capacitor and become to AGC voltage. No color – black and white picture This is means absolutely no color – equivalent to datasbeet black and white picture. If H-Lock not detect, then stop vertical sync separation. The diverse current flow back pin1 of Ddatasheet via R The output amplitude is 2Vp-p.
(PDF) LA76931 Datasheet download
For exampleif a TV has no vertical deflection and no picture it is much more likely that dataeheet common power supply output has failed than for parts in both the deflection and video subsystems to be bad. Defective chroma chip do not suspect this first just because it is probably very expensive.
Note that to the average person, the obvious question becomes: Min Each control variable range is show below: This make the current between pin3 and pin7 of T51 1 to decease. It also makes sense to identify exactly what is and is not working so that you will know whether some fault that just appeared was actually a preexisting problem or datashwet caused by your poking.
PIN18 I reference This is a pin for producing reference current. Your frequency counter may be double triggering due to noise or imperfect signal shape.
A The desired yoke current is not quite a sawtooth but includes two major corrections: While stating that your experience in these endeavors is measured by the number of scars you have may be stretching the point, expect to screw up – we all can point to that disaster due to inexperience or carelessness.