Skyworth LCD TV 37L05HR boot light red, immediately turned blue, the screen has no light, measuring power supply high voltage two-in-one board, 5V, 12V, 24V are all normal, but the backlight control terminal has no voltage, short-circuit 5V with tweezers and The backlight control terminal pin is found to be able to illuminate the backlight, so it is judged that the power supply high voltage board is normal and the fault is on the main board. In view of the fact that the density of the motherboard parts is too small, it is not easy to repair, and the customer can take away the motherboard, and it can be repaired and repaired. The customer agreed, so take the motherboard back to the store and repair it slowly. Connect the motherboard to 5V, 12V voltage check, found that a three-terminal regulator AS1117L-18 is not normal, replace it, measure the backlight control terminal with 5V voltage, and the indicator light can be controlled, with the remote control switch machine Turns red and blue. The repair was successful. The picture is a bit messy, and I don’t know how to organize it. I will watch it. Semiconductor Fuse And Ferrite
Fuse refers to an electric appliance that, when the current exceeds the specified value, melts the fuse and disconnects the circuit with the heat generated by itself.When the current exceeds the specified value for a period of time, the fuse melts and disconnects the circuit with the heat generated by the fuse itself.A current protector made from this principle.The fuse is widely used in high and low voltage power distribution system and control system as well as power equipment.
Ferrite is a metal oxide with ferrous magnetism.As far as electrical properties are concerned, the resistivity of ferrite is much larger than that of single metal or alloy magnetic materials, and it has higher dielectric properties.Ferrite magnetic energy also shows high permeability at high frequencies.As a result, ferrite has become a non-metallic magnetic material widely used in the field of high frequency and weak current.Due to the low ferrite magnetic energy stored in the unit volume, saturated magnetic induction strength (Bs) and low (usually only pure iron 1/3 ~ 1/5), and thus limits its higher requirements in the low-frequency magnetic energy density in the field of high voltage and high power applications.
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