Skyworth LCD TV 42L02RF boot instant black screen fault repair - android - Phones Developers

MOS power IC full range

Probe high current needle 120 needle head diameter is 3.0 threaded needle high current needle total length is

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

inductance

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

The first LCD repair: Skyworth LCD TV 42L02RF, the boot image is normal, the black screen is instantaneous, the sound is normal! There is a kind of charred taste inside the machine. When the machine is turned off, see the power board, motherboard, high voltage board without abnormalities and odors. The screen body has 18 pencil-thin tubes, and it is found that there is a burnt mark at the lamp holder on the upper left side. It is scraped with a saw blade and found that the size of the soybeans has been communicated with the backlight iron cover. There is also a The screw hole of the installation screen has also been boiled! Look for a small piece of the cut piece. The lamp holder plate is not far away with a fixing screw. Use a screw on the small plate to make the same size hole and put 704 silicone on the lamp holder. Insert the hole piece on the bottom of the board to adjust the hole and the same hole as the base plate screw, and screw on the screw. Put 704 on the burning surface of the lamp holder plate, stick a small piece of high-pressure cap rubber leather to separate the iron piece from the lamp holder. There is no screw hole distance, and the screw hole is also filled with 704. Cover the lamp holder cover... Install the machine here. The repair is over.
Summarize the cause of the machine failure: At the beginning of the assembly, the lamp holder iron plate is too close to the fixed screen screw to cause irregular high-voltage ignition, discharge the screen backlight cover, burn the screw hole and the lamp holder plate for a long time, and protect the circuit by high-voltage discharge. Black screen.