Responding to a 46-inch Samsung LCD TV with a black screen failure. After disassembling, the PFC voltage on the IP board BN44-00341A is 389V, and the IP board outputs 12V to the main board, and 5V is normal. The main board outputs to the IP board's lighting control INVERTERON/OFF and PWM are high. Explain the fault in the backlight circuit and its load. Test the backlight ICLX6503AID 1 pin 12V normal, 16 pin VREF no voltage, and then test 7 pin EN enable is actually 0V! After the power is turned off, the test 7 feet are not short-circuited to the ground. Followed by the 7-foot print trace cleaning, found that 7 feet through the RI814 silk screen 01D resistors connected to the optic coupler PC803S 3 feet, and the motherboard issued the lighting control INVERTER connected to the PC803S 4 feet, obviously the fault should be the optocoupler PC803S 4 feet and 3 The foot is not connected. Float level gauge is a liquid level measuring instrument which works based on the principle of constant buoyancy in buoyancy (Archimedes theorem).In the gravity field, the vertical upward force on the object in the fluid due to the density difference with the surrounding fluid is buoyancy. Float Level Gauge,Marine Magnetic Float Level Gauge,Liquid Level Float Gauge,Float Type Level Gauge,Magnetic Float Type Level Transmitter Taizhou Jiabo Instrument Technology Co., Ltd. , https://www.taizhoujiabo.com
The 1.2-pin of the optocoupler PC803S is printed and cleaned. It is found that the 2-pin of the optocoupler PC803S is connected to the K-pole of the UB801 patch 431, and the R-pole of the UB801 is detected whether the PFC voltage reaches 380V, and the PC803S has 1 pin. Through two resistors RI875 silk screen 30B.RI873 silk screen 30B connected to PFC drive power +14V. It was found that RI87530B=2K became more than 200K. After the replacement of the RI875, the test machine was successfully repaired. Thanks for watching!
In a liquid, an object whose overall density is lower than the liquid density will eventually float on the liquid surface. This object can be called a float. Under constant conditions, the buoyancy of the float is constant (constant buoyancy).
When the float is subjected to an upward force less than its own weight or a downward force less than the weight of the liquid equivalent to its own volume, the characteristic that the float will eventually float on the liquid surface will not be changed.
In the steady state, the buoyancy of the float is constant.
When the position of the liquid surface changes vertically, the vertical position of the float will change synchronously with the position of the liquid surface under the action of constant buoyancy.
The float level gauge is a device that displays the vertical position of the float in the form that people can read directly through various mechanical, electromagnetic, optical and other physical means.