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This represents a short-circuit at the secondary side of the flyback.
LA76810B, LA76812, LA76814
At this point with a confirmed color signal source, there is a problem with the chroma circuitry. Do not expect to find the circuits shown above staring you in the face when you get your service manual. Tint control set center value. Datasheeh connectors are keyed against incorrect insertion or interchange lengths or have slightly different thread types.
But it needs adjustment at engineering sample stage.
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 pole in ohm scope meanwhile observe the reactivity on the output device. Get used to the idea of working without a schematic. It probable causes flashover and smoking inside the set.
A degauss control circuit including a Posistor a combination of heater disk and Positive Temperature Coefficient PTC thermistor in a single package. Once unplugged, sheet metal shields or other ground points should be safe and effective.
It is connected with the base of V and controls the degree that V turns on. The input impedance Ri is about 1. Nextcheck the setting of the color control – it may have accidentally been turned down. Do not care Output the color system of IC which is operating. The value of the resister is decide as below: The startup current cross the B-E of V and make it working in the amplificatory condition.
Data eepromp LC 55L1 Chroma LA | Iancomp’s Blog
For further assistance, please contact with oscillator manufacturer with the following notes in your mind.
The inducted voltage pin10 – pin16 will be more higher. This is called flat-bottom period or pulse interval.
The self-excitation oscillation circuit repeat again and again and produce switchmode signal about 40Khz. A defective CRT can cause a lack of a primary color – R,G, or, Dxtasheet or a short between two colors which will mess up the color but is not likely to result in a black and white picture.
The primary voltage that you see then is mostly a transformed version of the secondary voltage, over the series base impedance.
We recommended the value of C1 is 0. It is not generated by special circuit. Using external vertical trigger to reset countdown circuit.
The current Ic will increase, it causes the inductive voltage increases. When the scan begins, the yoke current is at the maximum value it the direction to charge the La768110b. One alternative is simply to cut the wire in a location that is well datasgeet from any place to short out, solder, and then do a most excellent job of insulating the splice.
The maximum drive current of Q1 is 1mA. What happens to the HV? Scrape off all of the old glue and then clean thoroughly.
The diverse current flow back daasheet of T via R Whenever possible, try to substitute a working unit. This means that also the la7680b -on moment of the HOT will vary with the load. But no more adjustment of horizontal frequency is needed in the mass-production products. Some possibilities in no particular order: It has the effect of modifying la6810b sawtooth current into a sine-wave shape.
This is the flat-top period of self – excitation pulse. Linearity over the two main axis should now be good. The advantage of a flyback rectifier is that it provides 7 times more volts per winding than a scan rectifier. The blanking output level of RGB is about 1.
Use a resister of 4. We mainly check the open-circuit fault in horizontal deflection circuit. The location of the zero crossing depends on the secondary load, notably the beam current.
LA76810B Inventory Search Results*
In TVit need switching typical power to provide stable DC. Timing is not very critical as long as it happens between the end of the flyback and zero crossing of the summed current. Before repairing, assure that the volume is on and the state of set is in Yes Hear if there is the voice liking Ka Chip Source Electronic co.
Regulator is based on the above theory. Failures – usually shorted diodes-are common. Select a work area which is wide open, well dataheet and where dropped parts can be located – not on a deep pile shag rug.