A Skyworth 29-inch HDTV, faulty three, opened the inspection and found that the circuit board has been burned a large hole, the digital version has been judged to be bad, because the local can not buy a digital version and can not be repaired.é‚ Consider replacing with a common universal motherboard. Because it is a double-focus tube, the tube holder is first replaced with a double-focus tube holder. However, the normal version of the high-voltage package is single-focus, which is not enough to stump the person. The two focus poles are connected together. Connect the various plug-in parts to start up, the line output squeak, pull out the deflection normal, and use another deflection for the load to be normal. From this, it seems that the problem is on the line deflection because the line load is too heavy due to the low deflection resistance. How to do? So I found an impedance matching transformer tied to the high voltage package and connected with the modified machine. The grating finally appeared, but no matter how it was adjusted, the grating could not be satisfactory, so the idea of ​​the deflection coil was played. Remove the deflection yoke and carefully observe that the two windings of the row deflection are in parallel relationship, so the series connection method is changed. The specific method is: firstly, the two end ends of the row deflection coil are soldered with a soldering iron, and then they are Divided into four heads [this step should be noted, this deflection coil is wound by three strands and wound, and each strand is stranded with multiple fine enameled wires, and must not be scattered.] Then use a multimeter to group the coils, mark the two heads of the same coil and then connect the two heads of the different set together. The other two heads are connected to the deflection line to change the parallel connection. Try again to find that the grating is small and X-shaped, so take it off again and change the head and tail of one of the coils. This is good! The grating is finally normal! After carefully adjusting various parameters, I have been very satisfied. After a long test, I finally succeeded. High-definition TV change board success, this is a bold attempt I made, such as everyone who needs high-definition machine to change the board for repair, can also be used as a reference, but also do not have to fear HD TV, do not be stumped due to scarcity of HD TV accessories In the case of a last resort, HDTV can also be replaced with a common universal motherboard. If you feel good, support it.
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