[/attachimg][attachimg][size=5][color=Red] Skyworth cool TV, when the user pulls the image full screen fine drawing, and the image flashes up and down, like the old TV field is not synchronized.
Open the thick side power board and the digital board small signal voltage is basically normal, {this is my habit of repairing TV, no matter what the problem, we must measure the voltage of each key point}, did not find the problem, measure the voltage of the logic board, found The voltage of the logic board keeps fluctuating with the screen. It seems that there is a problem with the logic board. Therefore, the upper screen line on the right side of the logic board is removed experimentally. The black screen on the right side is turned on, and the left side is still flashing. The left side of the cable is restored, and the left side is pulled out. Cable, the screen appears dim blue screen, faintly visible fine vertical line, but the VGH voltage on the logic board has not been measured, the two upper screen lines are pulled out or there is no VGH voltage, just a repaired 40 in the store Miscellaneous LCD, experimentally pulled the upper screen cable, the measurement still has 15 volts, all kinds of signs indicate that the logic board is hung up.
Ordering immediately, after a few days, the goods are loaded into the machine experiment, suddenly the heart is cold, the sound of the waves is still, is the screen hanging? But with the feeling that it is not like, again carefully measure the logic board voltage, in addition to the 12 volt power supply stability, there is no stable voltage on the board, remove the upper screen cable, the logic board is not even a decent voltage, it is strange, according to The result of another logic board measurement, the board must have a stable 15 volt screen at the very least, although the board is not the same, but the logic board should work basically the same, it seems that this TV is really bad, decided to give up .
It’s okay to catch up with the rain and rain, and think of this TV. I feel that this TV is not like the screen itself, and I think about the whole repair process. Suddenly a bold idea emerged. Is this logic board not directly forming VGL and VGH? Voltage? After unplugging the two flexible cables on the screen, the main chip of the logic board has no basic power supply. According to his own assumptions, there should be a chip and a logic board on the screen. The working principle should be that the motherboard is sent. The 12 volt voltage is directly on the screen through the logic board to supply power to the circuit on the screen. After the chip is working, the output voltage is sent back to the logic board to supply power to the logic board chip. After the chip works, it is possible to form various voltages and send them to the screen.
The idea is certain. I decided to remove the screen and carefully remove the outer casing and the bezel. I saw that there is a chip-centered circuit on the left circuit board. The boot measurement found that the chip directly formed VGL and VGH voltages, but they were all fluctuating and measuring. The triode diode capacitance was not obviously damaged. It was suspected that the chip was broken. Suddenly, I remembered that the upper screen cable had not been checked. The copper foil at the buckle of the screen line was removed and a circular pit appeared in the middle due to the pressure of the bayonet. Adjacent copper foils are similar to non-connected, so the two flat-wire heads are subtracted by two millimeters with scissors to install the machine, and the fault is eliminated.
After the repair, the voltage of the logic board has a voltage of 15 volts, and the second step of the screen is boosted to 25 volts. This also means that the idea is correct. The logic board chip is controlled by the on-screen chip. [/color][/size]
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