Modify 15-inch square positive computer monitor into a TV ----- Display This TV method

Author: Xue Xiangyang Be After checking, this monitor is quite good, it is recommended to change a new outer casing, which is convenient to use and beautiful. Buy a 15-inch kit (including the motherboard and the shell with it), the manufacturer has installed the speaker, panel button, remote receiver head, power switch, and the antenna corresponding to the motherboard on this kit, and the back shell and the antenna corresponding to the motherboard and The position of the AV jack is quite convenient. Motherboard model RY-1417-C-01. PCBVER6.0, using Sanyo super single La76931k, field block UTC78040, sound amplifier UTC2003, etc. Step 1: Install the image tube on the new housing. The measurement of the deflection coil resistance is about 0.5 Ω, too small (can also be an impedance matching to correct). Carefully observed, it was found that in order to adapt to the needs of multi-frequency display; the two sets of coils of this machine deflecting coil used a 11-wire and wrapped in parallel, and two impedance matching coils were formed, and the resistance per line in the 11 line was 4.4Ω. When modified, cut the 6 lines in each set of coils, that is, the left left, and will be connected to the series, and the two matching coils are removed. At this time, the line deflection resistance is 1.8 Ω, basically meet the requirements (note : The phase is in line in series, otherwise an X grating may occur. The output resistance value of the measurement site is 6.5Ω, which is small, and regardless of. Step 2: Confed for the new old moving plate, just plug in the image tube ground cable. Step 3: Connect the antenna, the test machine, the sound is normal, the image is very large, and the field is only half of the normal, but the field linearity is good. Firstly, the big problem is handled. On the S correction capacitor and the capacitance of the capacity of 824, the total capacity is about 1.2μF (the magnitude of this capacitor is increased, the decrease is reduced), boot, found that the line is basically normal, just blue screen The word "joy" is left left. The inductance of the "happy" word is normal in the line deflected by one end of the string. Then the processing field portion. Because the field linearity is good, only the field level is taken. After the R459 is changed from 1.5Ω to 1Ω, the field is basically normal. Finally, enter the bus to adjust the parameters of the center, the field center, field linearity, field amplitude, until the image is optimal.

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