After Skyworth TV turned on, it suddenly turned black and did not respond after the operation of the TV. What should I do? What caused it? Skyworth's black screen after turning on the TV may be caused by improper operation, or it may be a failure of the TV itself. The specific solution for Xiaobian will give you a detailed introduction.
Skyworth TV screen after booting how to do four troubleshooting programs
Black screen phenomenon caused by improper operation
1, poor power contact
Normally we don't pay too much attention to the TV's power supply, but perhaps it is for this reason that the TV suddenly turns black. If the Skyview LCD TV's power plug is loosened, then touching the power source while watching TV or just turning on the TV will likely result in a black screen.
2, the voltage instability
In general, the electricity used in our lives is generally 220 volts, but due to circuit problems, sometimes the voltage used by households may become unstable and fluctuate. Once this happens, TV Your protection device will run, cutting off the power and protecting the TV. This is one of the reasons for the black screen. Of course, there is a final case where there is a problem with the TV's display screen. This situation is generally less likely to occur.
Which faults cause Skyworth LCD TV black screen, how to repair
1. Symptoms: Skyworth TV turned on after the blue screen and then black screen, remote control button operation does not work
Troubleshooting: Open the case, first measure the power supply circuit is normal, suspect the main chip is working abnormally, first replace the peripheral crystal oscillator failure. The main chip is considered to be abnormal inside. After the replacement, the fault persists. DDR abnormality can also cause the main chip to work abnormally. Replace the U14 (HY5DV56) DDR, power on the test machine, the LCD TV is working properly, troubleshooting
2. Symptoms: Skyworth LCD TV is turned on and the display is on, then “black screenâ€, the indicator light is on
Troubleshooting: According to the fault phenomenon, the inverter protection circuit starts. Disassemble the machine to observe the light-emitting status of the lamp at the moment of power-on, and find that half of the IC603 tube is light and half dark, with a "black screen" of about 15 s. Power-on measurement IC501's 6-pin voltage rises to 2.8V (with a normal value of 0.5V, the lamp goes out to 0V), apparently the overvoltage protection circuit starts.
The rectification and filtering circuits D511, D505, D520, and D521 of the 6-pin external over-voltage protection circuit of the IC501 are disconnected one by one, and the startup test is performed each time the circuit is disconnected. When the D520 is disconnected, the power-on circuit can normally light the lamp. Checking the D603's associated T603 “secondary†side overvoltage detection circuit, it was found that the resistance value of R564 becomes larger, so that the lamp feedback voltage is too high, causing the IC501 protection to stop working.
3, failure phenomenon: Skyworth TV boot only after the brand name of Skyworth on a black screen, which is a common problem Skyworth backlight, the general occurrence of this problem is when the backlight high-voltage inverter and control transistor are empty welding .
Troubleshooting: Add back-plate high-voltage inverters and control triodes to tin-weld.
4, the phenomenon of failure: Skyworth TV black screen when there is a sound with a character on the situation that the circuit is basically normal, the CRT's lighting conditions are available, and its failure is mainly a failure of the brightness channel or loss of brightness signal Defective decoding circuit.
Troubleshooting: When the brightness of the TV channel or when the brightness of the signal is lost, this problem is not our own hands-on solution, this problem will not cause the brightness of the channel will not be completely transmitted screen required Bright, at this time we must ask the special staff to come to the maintenance. Defective decoding circuit can only replace the decoding circuit.
Skyworth TV screen after booting how to do four troubleshooting programs
Black screen phenomenon caused by improper operation
1, poor power contact
Normally we don't pay too much attention to the TV's power supply, but perhaps it is for this reason that the TV suddenly turns black. If the Skyview LCD TV's power plug is loosened, then touching the power source while watching TV or just turning on the TV will likely result in a black screen.
2, the voltage instability
In general, the electricity used in our lives is generally 220 volts, but due to circuit problems, sometimes the voltage used by households may become unstable and fluctuate. Once this happens, TV Your protection device will run, cutting off the power and protecting the TV. This is one of the reasons for the black screen. Of course, there is a final case where there is a problem with the TV's display screen. This situation is generally less likely to occur.
Which faults cause Skyworth LCD TV black screen, how to repair
1. Symptoms: Skyworth TV turned on after the blue screen and then black screen, remote control button operation does not work
Troubleshooting: Open the case, first measure the power supply circuit is normal, suspect the main chip is working abnormally, first replace the peripheral crystal oscillator failure. The main chip is considered to be abnormal inside. After the replacement, the fault persists. DDR abnormality can also cause the main chip to work abnormally. Replace the U14 (HY5DV56) DDR, power on the test machine, the LCD TV is working properly, troubleshooting
2. Symptoms: Skyworth LCD TV is turned on and the display is on, then “black screenâ€, the indicator light is on
Troubleshooting: According to the fault phenomenon, the inverter protection circuit starts. Disassemble the machine to observe the light-emitting status of the lamp at the moment of power-on, and find that half of the IC603 tube is light and half dark, with a "black screen" of about 15 s. Power-on measurement IC501's 6-pin voltage rises to 2.8V (with a normal value of 0.5V, the lamp goes out to 0V), apparently the overvoltage protection circuit starts.
The rectification and filtering circuits D511, D505, D520, and D521 of the 6-pin external over-voltage protection circuit of the IC501 are disconnected one by one, and the startup test is performed each time the circuit is disconnected. When the D520 is disconnected, the power-on circuit can normally light the lamp. Checking the D603's associated T603 “secondary†side overvoltage detection circuit, it was found that the resistance value of R564 becomes larger, so that the lamp feedback voltage is too high, causing the IC501 protection to stop working.
3, failure phenomenon: Skyworth TV boot only after the brand name of Skyworth on a black screen, which is a common problem Skyworth backlight, the general occurrence of this problem is when the backlight high-voltage inverter and control transistor are empty welding .
Troubleshooting: Add back-plate high-voltage inverters and control triodes to tin-weld.
4, the phenomenon of failure: Skyworth TV black screen when there is a sound with a character on the situation that the circuit is basically normal, the CRT's lighting conditions are available, and its failure is mainly a failure of the brightness channel or loss of brightness signal Defective decoding circuit.
Troubleshooting: When the brightness of the TV channel or when the brightness of the signal is lost, this problem is not our own hands-on solution, this problem will not cause the brightness of the channel will not be completely transmitted screen required Bright, at this time we must ask the special staff to come to the maintenance. Defective decoding circuit can only replace the decoding circuit.
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