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
|Published (Last):||19 September 2009|
|PDF File Size:||12.16 Mb|
|ePub File Size:||5.50 Mb|
|Price:||Free* [*Free Regsitration Required]|
At this point with a confirmed color signal source, there is a problem with the chroma circuitry.
However, there could be several interrelated problems if a comon supply voltage were missing, for example, if it is a knob, datasbeet it should be varying the control grid voltage relative to the cathodes of the CRT, this is not likely to be a very complex datwsheet.
The inducted voltage pin10 – pin16 will be more higher. A simple problem can turn into an expensive one due to a slip of the probe or being over eager to try something before thinking it through.
Above steps have accomplished the flyback function of quicky and cleanly reversing the current in T and ,as we will see,the deflection yoke as well. N is an photocoupler that implements light – electric conversion. Although V completely shut down, the current across pin3 and pin7 still exists and decreases rapidly through C and R For the use with the pa76931s outside of the range herein, or in the applications requiring high reliability such as car products, please consult with oscillator manufacturer.
The maximum drive current of Q1 is 1mA. Note that this is not be the same as what is commonly called linearity which would likely la769311s only one side or gradually change across the screen. At approximately mid-scan, the current passes through zero and changes polarity from minus to plus. Small ceramic capacitors are place across the diodes to reduce RF interference.
It’s a community-based project which helps datasgeet repair anything. The DC voltage is about 2.
Please use a 0. XT1,XT2 The sample oscillation circuit characteristics in the table below is based on the following conditions: When power is turned on ,a relatively high current is applied to the degauss coil wrapped around the periphery of the CRT. The measure is to feed some EHT information or beam current information to the deflection circuits, reducing the deflection current amplitude a bit for bright pictures.
When Selected Video Out Mode, this signal which is selected by a video switch among 56pin or 54 pin input signal, is amplified 6dB and then output here.
la76931 service manual – Datasheet PDF, IC Circuit
Its value is therefore not critical. The diverse current flow back dqtasheet of T via R Datssheet you substitute a heavier transistor more amps, more volts, more watts, faster switching, whatever for a lighter one, then there is a very big chance that it will fail earlier, not later.
This means finishing the behind porch of pulse. This means that also the switch -on moment of the HOT will vary with the load.
ELECTRONICS TRICKS AND TIPS: LA IC DATA SHEET
The characteristic of low frequency and the respond time when signal input is depending on datazheet value of this capacitor. To improve the buzz characteristic, we recommend the application circuit as below: At the time the current passes through 0,the S-cap 9 Is charged to its maximum. Set this function off in PAL system. When oa76931s video output amplitude more change, use this control.
During the second half o the scanthe HOT current ramps up approximately linearly. The horizontal Part of T la766931s yoke, damper diodeHot collector, snubber HV capacitor s ,and flyback primary all Flyback connect to the same point. In that case the beam current will not work and the set should switch off automatically, usually within a few seconds after applying power.
Data pin IC LA | bengkel electronic
Without special measures, brighter pictures will be larger. This is called S-correction. You can play similar games with focus voltage.
Timing is not very critical as long as it happens between the end of the flyback and zero crossing of the summed current. If R1 is increased, the loop gain will increase and the pull-in range will increase as well. If you get readings that do not datashest sense, you may be using your equipment in a way datashwet is confusing it. Always use an isolation transformer when working on a TV because this is especially important-for your safety – when dealing with the non- isolated line operated Power supply.
However, you may find that the cap on the CRT socket snaps off using a thin knife blade or screwdriver. What happens to picture?
Realize the coincidences do happen but are relatively rare. To prevent this ,some EHT information is fed to the contrast controller, to automatically reduce the picture brightness whenever the white content is too much. Do not immediately assume that your problem is some combination of esoteric complex convoluted failures.
Whenever possible, try to substitute a working unit. We begin our adventure at the end of the scan-retrace-when the Primary flyback period begins: This is applied both to the analytic procedures as well as to precautions with respect to probing the equipment.
The sample voltage is taken from RP The answer is a definitive NO. At the beginning of scanthe damper diode forward biased carries the bulk of the current from the yoke and flyback. The air gap stores energy, some of which may be tapped off during flyback by secondary rectifiers e. Please add a 5. The dynamic range of it is 3.
Do not expect to find the circuits shown above staring you in the face when you get your service manual. The failures are mainly in the small signal processing circuits.