After the sofa butler maintenance, we will encounter a variety of problems LCD TV, but we do not know how to solve. Today, Xiao Bian brought everyone several common breakdowns of AOC LCD TVs and how they are resolved. I hope to help everyone.
First, there is no image with sound
A black screen sounds to indicate that the machine is in a protected state. The reason is that the current in the tube is too large to cause the protection circuit to operate.
Open the back cover and boot
1, listen to whether there is a high pressure sound of the boot.
If there is a description, the circuit works normally (note that it is basically normal). If not, the circuit can not be considered as starting.
2. Observe whether the picture tube filament emits light
Glow, at this time slowly adjust the knob on the high voltage package while watching the screen changes, there will be roughly three cases:
AOC LCD TV
A. No change, indicating that the cathode voltage of the cathode of the kinescope is abnormal; check whether the 200v visual discharge power supply is normal.
B. A vertical bright line is due to the open circuit of the line deflection coil or the phenomenon of false welding in the solder joint.
C, a horizontal bright line, for many reasons, in addition to the field deflection coil open circuit or solder joints have a virtual weld or field output block solder joints have a virtual weld, the field oscillation, the output signal transmission circuit may have caused failure.
When the output power of the field output block and the peripheral circuit have no abnormalities, adopt the human body induction signal injection method (take the tweezers touch the input end of the field output block) to observe whether the horizontal bright line has a phenomenon of jumping or broadening; if there is a description of the field output The block works normally, the fault is in the field oscillation, and the signal output circuit of the field output, otherwise the fault is in the field output block itself.
AOC LCD TV
Second, Huaping
1, measure the motherboard clock is normal.
2, check the main board signal RGB from the input to the main chip part of the line (with or without welding, short circuit, capacitor resistance with or without error)
3, check the main board signal output to the screen leveling scorpion seat whether there is no welding, short circuit (IC foot, exclusion and seat, double row pin, pay special attention to the flat socket)
4. Replace the screen or replace the universal driver board if necessary.
AOC LCD TV
Third, the color is not normal
1. The user has a clear preference for display colors.
2. There are major defects in the color display of the monitor itself.
3, graphics card or video card driver failure, or software incompatibility issues.
Solution: In the "color" option of the system menu, there are four options "warm," "normal," "cool," and "user-defined." I suggest you think that the color of the monitor is not correct, first of all to see if this part of the choice is correct.
In general, using the default "normal" mode is sufficient. If you have customized and the changes are more complicated, please directly select the "Restore default settings (restore factory settings)" option in the system menu, you can restore the monitor's default factory settings.
AOC LCD TV
Fourth, the monitor is not bright
The lack of display is also caused by a variety of reasons. For example, the monitor is not connected to a power source; the computer host is not properly opened; the signal line between the monitor and the host computer is not properly connected, or the signal line is faulty; the monitor is blank and so on.
Solution: After turning on the monitor power switch, if the monitor's power indicator is green, then there is signal access. If it is orange, no signal is connected. Checking whether the monitor is powered on is the primary solution to checking why the monitor is not lit.
First, there is no image with sound
A black screen sounds to indicate that the machine is in a protected state. The reason is that the current in the tube is too large to cause the protection circuit to operate.
Open the back cover and boot
1, listen to whether there is a high pressure sound of the boot.
If there is a description, the circuit works normally (note that it is basically normal). If not, the circuit can not be considered as starting.
2. Observe whether the picture tube filament emits light
Glow, at this time slowly adjust the knob on the high voltage package while watching the screen changes, there will be roughly three cases:
AOC LCD TV
A. No change, indicating that the cathode voltage of the cathode of the kinescope is abnormal; check whether the 200v visual discharge power supply is normal.
B. A vertical bright line is due to the open circuit of the line deflection coil or the phenomenon of false welding in the solder joint.
C, a horizontal bright line, for many reasons, in addition to the field deflection coil open circuit or solder joints have a virtual weld or field output block solder joints have a virtual weld, the field oscillation, the output signal transmission circuit may have caused failure.
When the output power of the field output block and the peripheral circuit have no abnormalities, adopt the human body induction signal injection method (take the tweezers touch the input end of the field output block) to observe whether the horizontal bright line has a phenomenon of jumping or broadening; if there is a description of the field output The block works normally, the fault is in the field oscillation, and the signal output circuit of the field output, otherwise the fault is in the field output block itself.
AOC LCD TV
Second, Huaping
1, measure the motherboard clock is normal.
2, check the main board signal RGB from the input to the main chip part of the line (with or without welding, short circuit, capacitor resistance with or without error)
3, check the main board signal output to the screen leveling scorpion seat whether there is no welding, short circuit (IC foot, exclusion and seat, double row pin, pay special attention to the flat socket)
4. Replace the screen or replace the universal driver board if necessary.
AOC LCD TV
Third, the color is not normal
1. The user has a clear preference for display colors.
2. There are major defects in the color display of the monitor itself.
3, graphics card or video card driver failure, or software incompatibility issues.
Solution: In the "color" option of the system menu, there are four options "warm," "normal," "cool," and "user-defined." I suggest you think that the color of the monitor is not correct, first of all to see if this part of the choice is correct.
In general, using the default "normal" mode is sufficient. If you have customized and the changes are more complicated, please directly select the "Restore default settings (restore factory settings)" option in the system menu, you can restore the monitor's default factory settings.
AOC LCD TV
Fourth, the monitor is not bright
The lack of display is also caused by a variety of reasons. For example, the monitor is not connected to a power source; the computer host is not properly opened; the signal line between the monitor and the host computer is not properly connected, or the signal line is faulty; the monitor is blank and so on.
Solution: After turning on the monitor power switch, if the monitor's power indicator is green, then there is signal access. If it is orange, no signal is connected. Checking whether the monitor is powered on is the primary solution to checking why the monitor is not lit.
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