When televisions are used for a long time, there will always be a variety of breakdowns, of which the most common ones cannot be counted. Today, Xiao Bian has provided welfare for everyone: Solutions for various brands of TVs cannot be opened. You can look at them by yourself.
Skyworth TV can not be opened
Phenomenon 1:
Skyworth TV restarts itself when watching, but it cannot be turned on after rebooting, and the color of the power button is always red.
Solution:
The appearance of such a phenomenon may be a failure of the secondary power supply of the television or damage of the components of the load circuit. First open the TV to check whether the component is obviously damaged. Measure the output of the secondary power supply. Generally, the secondary power supply of the TV is very easy to be damaged. Just replace the power supply in time, and the components will be damaged. This is also the case.
Phenomenon 2:
Skyworth TV can not be turned on for the first time when it is turned on, but it can be repeated for the second time.
Solution:
When Skyworth TV cannot start, you can try to tap the TV lightly to see if the TV can be turned on. If the TV can be switched on, it means that there is a place where the TV's wiring board is open. At this time, we only need to re-weld the TV's wiring board. Skyworth's TV cannot be turned off.
Phenomenon three:
Skyworth TV did not use the display of the power supply when it was turned on. This situation has caused Skyworth TV to fail.
Solution:
It may be that the protection circuit of the TV has malfunctioned. At this time, it is sufficient to replace the fuse of the TV. However, if the screen of the TV does not respond, it may be that the television phenomenon is broken. This requires a professional to find out. Your TV is repaired.
Phenomenon 4:
Skyworth TV can't drive, but the TV's power light is bright.
Solution:
First, check if your remote control is normal and the remote control has failed. You can press and hold the TV's control button to debug. Second, hold down the TV's TV/AV button to see if you can call up another mode. The TV has no image or standby pattern.
AOC TV can not be opened
Phenomenon 1:
The TV can't turn on when the machine is turned on.
Solution:
Too much moisture and too much dust inside. The sound is the sound of the electrode sparking long time can damage the internal components of the TV. It is not recommended. This is the high-voltage package of high-pressure caps produced by the leakage of arcs and sparking sounds first to change the high-pressure cap to drop off the high-pressure cap around the clean and clean on it.
Phenomenon 2:
Three no lights are not lit (no sound, light, no picture and no light)
Solution:
The premise that the CPU issues a standby command is that it must have a working voltage of 5V or 3V. This set of voltages is required by the power supply. The first step is to ensure that the CPU operating voltage is available. Most protection circuits use the standby circuit of the CPU. To achieve protection, we can first clear the standby and protection circuit terminals from the circuit diagram, and also ensure that these circuits can work in a normal state.
Sharp TV can not be opened
Phenomenon 1:
Randomly failed to boot normally.
Solution:
Can not boot normally first suspect that the switching power supply circuit and remote control system control to open. Shut down the corresponding circuit. So when the fault occurs, check the capacitor C834, found that its leakage, capacity reduction, so that the standby power supply voltage is too low, the microprocessor startup circuit V810 can not provide a normal reset voltage to the N701 pin 27, so the microprocessor can not Normal operation, causing the aforementioned failure phenomenon, replaces a new component of the same type.
Phenomenon 2:
Just started the moment there is a "click" sound, then there is no light silent.
Solution:
Check the thyristor V819 protection circuit components. It was found that the voltage regulator diode V820 (6.2 V) on the V819 (SFORIlM2) G pin has broken down. After switching on, the output voltages of 130V, 24V and 25V are all restored to normal. Remove the dummy load and weld the R411 tester. Both the image and sound are normal.
Phenomenon three:
The indicator light is on, but the power cannot be turned on, no light and no sound.
Solution:
Because it is "three nos", the output voltage of each group is first tested to be normal, indicating that the fault is in the load circuit. No response after power on. Further measured IC501 8 and 9 pin voltage is about 2.2V (normal is 7.7 V), determine the fault in the IC501 and its peripheral circuits. Check the IC5017, 8 and 9-pin external components, and replace the current C707 (2200pF) capacitor tester.
Samsung TV can not be opened
Phenomenon 1:
Three no boot, can not boot the next time.
Solution:
The voltage of pin 4 of microprocessor N801 (LC8645J6V -5C18) is detected to be 0.6V. Indicates that the aircraft is in standby protection. Disconnect the N801's 41-pin external jumper wire W071, which will disconnect the protection circuit. The boot raster is normal, but the image appears as a treadmill. This indicates that there is a fault in the AFT circuit of the aircraft. Check the amplifier power supply circuit and find that the current limiting resistor R645 is open circuit. Acoustic amplifier block N001 internal breakdown of the 8 and 10 feet, replace R645, N001 troubleshooting.
Phenomenon 2:
Sometimes the boot fails; there is a "click" at the moment of boot.
Solution:
Check that the 36, 37, and 38 pins of the CPU IC101 (CTV2225) on the mainboard are all grounded, but the 36-pin voltage is measured on the road test. Normally, it is 0V, and when it fails, it is 1.5V. Welding 36 feet, boot failure is ruled out, there are pictures and sound. Apply a 680Ω/5W resistor to the 59-pin C337 (1000μF/25V) of the amplifier LA444 to relieve boot-up “clickâ€.
Panasonic TV can not be opened
Phenomenon 1:
The TV will not turn on, the indicator will flash, and the keys will not work.
Solution:
The measured +B output voltage is 30V, and the +5V output voltage swings around 4.2V. It is apparent that the microprocessor does not work and the buttons do not work. The TV is in the standby state. No problem was found in the circuit to detect the reset circuit component. The reset circuit component was re-welded again. The power-on condition was normal. After the V824 was tested, the power was normal.
Phenomenon 2:
When the power is turned on, it sometimes fails to start, and sometimes it can start work. However, the screen image appears as a “screen†and sometimes it will shut down automatically.
solution:
Looking at the circuit structure of this machine, the preliminary judgment problem may be in the circuit between IC401 (SAA7117A) and IC105 (MST5151A). It should focus on checking this part of the circuit first. IC401 integrated circuit model SAA7117A, with a model of integrated circuit replaced, troubleshooting.
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