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This phenomenon is commonly known as TV white screen failure, most of the reasons for this failure is the line problem, the data can not be normally transmitted, resulting in the image screen can not be displayed, repair the white screen with no sound image should contact the customer for repair.
Maintenance one: Kai Haier LCD TV screen power supply is 5V, measuring LVDS signal voltage is about 1.1V! Suspected screen logic board is bad, carefully open the screen logic board plastic protective film, found F1 damage, continue to check and found C45 short circuit, Remove it and test F1 end resistance to ground is more than 1K, normal. Put on the fuse for troubleshooting!
Overhaul 2: There is no image on the white screen of the TV. Suspect the fault on the decoder board and replace the decoder circuit board. Boot test machine, the sound remains. I looked back and thought and thought, there was no image and the backlight driver circuit was normal. The decoder board also changed. At this time, it was diagnosed as bad logic board, because there was no logic board replacement at that time.
Carefully open the screen because there is no data on the logic board, can only measure the insurance on the next board, all normal, then I do not know where to start, try to power under the amount of voltage, measured to insurance F01 found that two Swiss differential pressure, Short-circuit the wire for shutdown. Connected to the signal shows a clear image. 
First open the Haier TV, carefully observed that the width of the vertical black line is one-fourth of the entire TV screen. At the same time it was also found that there was a red line and two green lines inside the black line. The address drive of the Haier TV has 14 COF lines. According to the display principle of the PDP, it is initially judged that a logic board or an address-driven COF line has failed.
For further experiments, disconnect the LVDS cable. The fault phenomenon is that the entire screen turns black, but there is still a red line and two green lines corresponding to the original black line. It is now certain that the logic board or address-driven COF line has failed.
Carefully dismantle the COF plug corresponding to the black strip. No abnormality is found. Replace the COF cable and the fault disappears. In order to ensure the availability of the repair, one day after another, the same failure occurred. The replacement of the logic board is invalid. After the replacement of the entire LCD screen, the fault is rectified. 
3, Haier LCD TV does not show the image after boot
If there is no sound on the TV screen, the cause of this failure may be the following:
1) Circuit tube current is too large to cause circuit protection.
2) The backlight or the logic board did not work causing the TV to have no picture with sound failure.
3) The power supply circuit of the kinescope is faulty, the receiving circuit of the high-frequency head fails, and the signal fails.
4) Insufficient welding of the internal parts of the machine results in the failure of sounds and images.
5) There are problems with Haier's TV sockets.
If there is no sound on the TV screen, the cause of this failure is different from the above reasons. The specific content can be seen from the following details provided by Beijing Haier TV service personnel.
1) There is a poor contact between the high-frequency head and the intermediate circuit.
2) The circuit of the high-frequency head and the mid-range power supply has the phenomenon of desoldering or poor contact. 
The main reasons for this phenomenon are the following points. The maintenance process can be used as a reference.
1) Haier TV power plug is loose and can be replaced to ensure normal power supply.
2) The fault of the transformer in the TV machine needs to be contacted by a TV maintenance person to repair or replace the transformer.
3) The electronic instability is caused by voltage instability. If the power environment is not bright or the components in the TV are aging, the circuit load will be too high, causing the TV to turn on and off automatically.
4) The rear projection of Haier's TV is damaged. If the bulb thermistor or the color wheel does not turn on, it will turn on automatically.
Xiao Bian concludes:
These are the common Haier TV troubleshooting methods summarized by Xiao Bian. If this article fails to solve your problem, please visit the TV home Haier TV. We have prepared detailed assessments, tutorials and troubleshooting information for you. You can also log in to the TvHome forum, where a large number of users join in discussions with you to get your satisfactory answer.
For ordinary home TVs, for a long time, it is inevitable that there will be some minor problems. The appearance of television problems will often affect the user's experience of television functionality. When the problem arises, how should we solve it? The following small series summarizes the troubleshooting of common problems of Haier TVs. Friends who have encountered similar problems can be handled according to the tutorial. 1, Haier LCD TV boot image does not display 2, Haier TV screen left vertical black line 4, Haier LCD TV automatic switch machine