How to exit the bus of sharp lcd-60lx540a
Author:Wang Shoufeng Time:2021-09-09 15:46 Browse(454)
Sharp lcd-46lx430a power supply board was damaged due to LED driver. After repair, the backlight of the power supply was not on. After inspection, it was found that the power supply of backlight driver bd9211f was 12V, ofl had 3V starting voltage, led oscillation transformer t7001 had no AC voltage, and T7002 had no AC voltage.
Sharp lcd-46lx430a power supply board was damaged due to LED driver. After repair, the backlight of the power supply was not on. After inspection, it was found that the power supply of backlight driver bd9211f was 12V, ofl had 3V starting voltage, and led oscillation transformer t7001 had no AC voltage, T7002 also has no AC voltage.
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How to exit the bus of sharp lcd-60lx540a

at that time, it was judged that bd9211f might be damaged.
but if you think about it carefully, the damage of LED driving triode q7019 and q7020 is not related to the damage of bd9211f. Therefore, after careful analysis of the power board plug-in, it is found that the backlight start STB has no high level. When con7002stb is connected with of, the LED lights up for a few seconds, Finally, analyze the normal working state of con7002 plug-in voltage.
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in standby, 13V is 6v5v.
power on is 13V, PS-on is high, ofl3v is high, pnl-on is normal, STB is also high.
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then suspect the main board fault.
refer to the online statement, then power on and press the video key and volume down key.
sure enough, the TV can power on.
and everything is normal, However, the volume is only in three states, 0-30-maximum, which seems to be the motherboard. According to the statement, maybe the motherboard has been locked when the user starts the machine repeatedly.
now the only way is to ask the master to unlock it.
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ningwai's machine was repaired half a month ago, and it was also damaged q2019.
q2020, The previous user turned on the TV for many times, so it was not locked.
this power board seems to be a common fault of the board.
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sharp lcd-40lx620a is a 40 inch high-end LCD TV launched by sharp.
it has super crystal panel, LED backlight and uv2a technology,It plays an important role in improving the image quality.
nbsp; The body of sharp 40lx620a LCD TV is made of metal.
the screen frame is wrapped with silver gray frame, which is full of sense of the times; In the upper left corner is the aquos logo, which is made of silver metal; sharprdquo; The logo is in the center of the bottom border; The loudspeakers are set at the bottom, slightly bent inward, which makes the body stable and thick.
sharp 40lx620a LCD TV adds led.
it improves the brightness and contrast of the picture, and at the same time, it has a good energy-saving effect.
in addition, sharp's unique light transmission technology "is added to the 40lx620a LCD TV; uv2ardquo;.
precisely control the deflection direction of liquid crystal molecules, effectively improve the utilization rate of light and the opening rate of liquid crystal molecules, so that more light can pass through the liquid crystal panel, have higher peak brightness, and make the white more clear; uv2ardquo; The technology can accurately control the light passing.
effectively suppress the light leakage phenomenon of backlight, and make the black deep and rich.
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the technology can also accurately control the light passing.
the technology can effectively suppress the light leakage phenomenon of backlight
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