1. The TV has no sound and no image. The current of the tube bundle is too large to cause circuit protection.
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2. The TV has no sound, no image, and the backlight or logic board is not working.
3. The TV has no sound, no image, the power supply circuit of the picture tube is faulty, the receiving circuit of the high frequency head is faulty, and the signal is faulty.
4, the TV has no sound, no image, the virtual welding caused a fault without sound.
5, the TV has no sound, no problems, the tube seat has problems.
6. There is no image on the computer watching TV sound, and the Overlay display mode is enabled in the receiving program.
The working principle of the TV: the composite image of the image and sound accompanying the TV station is selected by the high frequency head to obtain the composite intermediate frequency signal. After amplification, the sound signal is separated from the sound, and the sound is amplified by the low frequency to the speaker output sound; the image signal is amplified. The picture is displayed for the picture tube, and at the same time the "synchronization signal" is separated from the picture signal for the picture tube to stabilize the picture (synchronized with the picture transmission). After the external power supply is connected to the TV set, a stable DC voltage is supplied through the so-called "switching power supply circuit" for "row output" operation, and the working output power of each part of the television is provided through the transformer and the rectifier circuit in the line output circuit.
Fault 1: After the boot, there is only sound, but the noise, no image, this may be a problem with the high frequency head and the middle; in general, the picture tube should be able to display the machine setting menu, with audio and video input interfaces, Play external audio and video signals. Fault 2: There is a normal TV program sound, indicating that the high frequency, intermediate frequency, and sound circuits are working normally, and the line output circuit has no short circuit fault. If the screen can display the TV settings menu, the fault may be separated from the audio drop.
Fault 3: The sound is normal, the screen menu is not available, the external video signal should be gone, the brightness and contrast are turned on (the remote control can not be used normally, if the machine is also equipped with adjustment), pay attention to the screen performance, shut down, such as Can see the shutdown for a moment, there is a flash of light on the screen, and there is a slight discharge sound, the picture tube is generally no big problem.
Fault 4: Turn on the back cover of the TV, power on to see if the filament of the picture tube is bright (the fault of the filament burnt is not common) Check the working voltage of each leg of the picture tube, especially the cathode voltage, the voltage should change with the brightness adjustment, if the brightness The adjustment is extremely dark, the electron tube of the kinescope emits almost no electrons, and the image is not.
Fault 5: Most TV sets now have remote control and electronic adjustment. If the CPU chip fails, the brightness will be out of control. No image is possible.
Fault 6: The motherboard uses almost single-chip integrated circuits, centralized playback, audio and video processing, etc. in a circuit. If there is no corresponding information, checking is a troublesome thing. Color TVs generally have amplification circuits corresponding to three primary colors (mostly in the tube). On the tail) all the way to failure will form an abnormal color, and there are few opportunities for all three roads. There is a sound to explain that the power supply, output and line circuit work is basically normal, the screen is not bright, please check the high voltage, picture tube, brightness, middle and other circuits, focus on the line output circuit. Whether the filament is bright to determine whether the line starts to oscillate. If the filament is not bright, the tail plate is generally not well contacted.
The shipboard medium voltage power cables are intended for shipboard and off-shore building to transmit power.
Standards applied: IEC60092-350, IEC60092-354, IEC60092-360, IEC60228, IEC60332-1-2, IEC60332-3-22, IEC61034, IEC60754 and IEC60684-2.
Product making: factory name, type, rated voltage core.
Making: colour tape.
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