What's going on with rainbow tv?
1. Power issues。
Visual black screens may also be power circuit problems, and if black screens appear, television panels buttons do not react and television lights do not turn on. In the maintenance process, you can first check whether the power voltage is too low, then test the voltage with a universal meter, check the input level of the power circuit, check if the 12v voltage is converted to 5v voltage, and suddenly blackscreen the power。
2. The issue of voltage。
If there is a problem with television voltage, the pressure stabilizers can be installed to ensure the stability of the tv voltage and to avoid voltage anomalies. In the case of the input level of the power circuit, adjust the input level of the power circuit to ensure that the input pressure is normal。
3. Components connected to empty welds。
If the television starts normal, black screens appear suddenly in operation, text is displayed without image, and the sound of television is normal, possibly due to backlight high voltage reversers and control of the air welding of the 3rd level tube. This is due to the fact that the manufacturer did not wear cassiterite on the copper skin during the production process, resulting in a direct pasting of the original foot position with the copper skin and no effective welding. Re-encumbering is required for maintenance。
The solution for the black screen of long rainbow television:
1. As a result of abnormal power circuits, the 12v voltage is checked first for normality and then for 5v voltage. If no 5v voltage or 5v voltage becomes low, the input level of the power circuit becomes problematic. Such failures are common, usually in the form of fire insurance or pressure chip failure, and replacement of related components。
2. There is a problem with the circuit driving backlight. Connects the monitor to the host and starts the check. Watch closely near the screen. Common malfunctions of the pressure plate include insurance combustion of the pressure plate itself, switch chip failure, etc., and replacement of related components。
