Changhong LCD TVs that have just been bought for less than a year have even appeared in Huaping. What is the reason for this? Can it be guaranteed? How to calculate the maintenance price? Below, the author and everyone to share the reasons for the Changhong LCD TV Huaping, while analyzing how to repair it, and interested friends worthy of attention.
In general, there are five major factors for LCD TV screens: first, signal source transmission; second, logic board failure; third, poor connection of the connection lines (mainly the connection lines from the logic board to the display screen); Screen parameter error; fifth, the display is damaged. Knowing the reasons of Changhong TV Huaping, the next step can be targeted maintenance.
Problem I. Source
Solution: Move the TV to a place where the signal is relatively better. If the TV screen is still not good, it is a TV failure. If the picture becomes clear, it is the problem of the cable signal. Now.
Problem two, logic board failure
solution:
(1) Whether the input video signal waveform sent from the digital image processing circuit is normal on the detection logic board. If there is a normal waveform input, it means that the preceding digital image processing circuit is working properly.
(2) Check if the voltage input from the power supply on the logic board is normal. If the input voltage is normal, the power supply circuit is working properly.
(3) Whether the waveform of the driving signal of the LCD screen output by the screen line interface on the logic board is normal or not, if there is no normal LCD signal driving wave type output, there may be a fault in the logic board circuit.
Problem three, connection line (screen line)
Solution: It may be the cause of moisture, resulting in leakage of the screen line. Check whether the circuit of the disassembler screen is unobstructed. Connect the logic board with the screen circuit and touch the chip on the logic board with hands to see if the image changes.
Problem four, screen parameter error
Solution: Images and characters appear on the screen, which may be an error in the screen parameters. Into the bus mode: In the TV mode, the volume is reduced to 0, press the mute button 3S on the remote control and then press and hold the local menu button, you can enter the factory mode menu. Adjustment method and data: The number following the Index represents the current adjusted index number, and can be switched to a different index number by pressing the “P+/P-†key under this page. During operation, directly press the number keys or press “P+/P-†key to select the adjustment item, and press “V+/V-†key to adjust the parameters of the item.
Changhong LCD TV software version is too low, the screen parameter data is prone to change, use USB to upgrade the machine, first decompress the software into the U disk's root directory, the U disk inserted in the machine's USB1, the whole machine boot After that, in the TV state, press the "menu" button on the remote control and press 6 - 1 - 6 - 9 consecutively. Then the machine automatically detects the U disk, indicating whether it needs to be upgraded.
Problem 5: The display is broken
Solution: If it is determined that the display is broken, it is only to find CHANGHONG after-sales service department to change the screen, but the author should remind one, the LCD screen is more than 60 percent of the total price of the TV, change the cost of a display is not Easy to change a TV.
In general, there are five major factors for LCD TV screens: first, signal source transmission; second, logic board failure; third, poor connection of the connection lines (mainly the connection lines from the logic board to the display screen); Screen parameter error; fifth, the display is damaged. Knowing the reasons of Changhong TV Huaping, the next step can be targeted maintenance.
Problem I. Source
Solution: Move the TV to a place where the signal is relatively better. If the TV screen is still not good, it is a TV failure. If the picture becomes clear, it is the problem of the cable signal. Now.
Problem two, logic board failure
solution:
(1) Whether the input video signal waveform sent from the digital image processing circuit is normal on the detection logic board. If there is a normal waveform input, it means that the preceding digital image processing circuit is working properly.
(2) Check if the voltage input from the power supply on the logic board is normal. If the input voltage is normal, the power supply circuit is working properly.
(3) Whether the waveform of the driving signal of the LCD screen output by the screen line interface on the logic board is normal or not, if there is no normal LCD signal driving wave type output, there may be a fault in the logic board circuit.
Problem three, connection line (screen line)
Solution: It may be the cause of moisture, resulting in leakage of the screen line. Check whether the circuit of the disassembler screen is unobstructed. Connect the logic board with the screen circuit and touch the chip on the logic board with hands to see if the image changes.
Problem four, screen parameter error
Solution: Images and characters appear on the screen, which may be an error in the screen parameters. Into the bus mode: In the TV mode, the volume is reduced to 0, press the mute button 3S on the remote control and then press and hold the local menu button, you can enter the factory mode menu. Adjustment method and data: The number following the Index represents the current adjusted index number, and can be switched to a different index number by pressing the “P+/P-†key under this page. During operation, directly press the number keys or press “P+/P-†key to select the adjustment item, and press “V+/V-†key to adjust the parameters of the item.
Changhong LCD TV software version is too low, the screen parameter data is prone to change, use USB to upgrade the machine, first decompress the software into the U disk's root directory, the U disk inserted in the machine's USB1, the whole machine boot After that, in the TV state, press the "menu" button on the remote control and press 6 - 1 - 6 - 9 consecutively. Then the machine automatically detects the U disk, indicating whether it needs to be upgraded.
Problem 5: The display is broken
Solution: If it is determined that the display is broken, it is only to find CHANGHONG after-sales service department to change the screen, but the author should remind one, the LCD screen is more than 60 percent of the total price of the TV, change the cost of a display is not Easy to change a TV.