The TV can t turn on, the power supply is on, the TV can t be turned on but the power light is on, w

The first thing to check is the power supply part to see if the power output is normal.

You have to see if you are using a black and white or color TV,If it's black and white, you can directly measure the output voltage,But if it's a color TV,It's not ordinary。

First of all, connect the negative pole of a bulb to the ground at the high voltage output foot of the switching power supply, and open the load section behind to see if the voltage is normal.

If you don't do that, you won't be able to measure the normal voltage, and you may even burn out the whole machine. If the measured voltage is normal, it should be good, indicating that the switching power supply part is good, and the other parts can be checked.

The next thing is to check the CPU, the CPU is the place to control the TV switch, if the CPU is not controlled, then it is naturally impossible to turn it on.

Test the voltage of the three shutdown points of the CPU, whether it is normal, if not, find the relevant power supply circuit, whether it is caused by the power supply circuit.

If the three-point voltage is normal, then check the triode controlled by the switch control foot to see if it is short-circuited or broken.

If this is also normal, then check the power supply foot of the memory, if the power supply foot of the memory has no voltage, it will also cause it to be unable to turn on, if these are normal, check the load part, the first check is the line output tube, to see if there is a breakdown or a short circuit, if a breakdown then it depends on whether it is caused by the front or the breakdown caused by the back, and the same method of connecting the light bulb is used to detect.

Or replace the high-voltage package to try, and then the place that may appear is caused by the three-color reduction circuit.

See if the indicator light is on.

Bright: The power supply is generally fine, it should be the line circuit and other circuits.

Not lit: The fuse is broken or the power supply does not vibrate.

Turn on and off: the power supply is normal, and the circuit is faulty.

Flash: Generally high voltage.

This phenomenon may be due to the failure of the secondary power supply of the TV or the damage of the components of the load circuit. First of all, disassemble the TV to check whether the components are obviously damaged,Measure the output of the secondary power supply,The secondary power supply of the general TV is very easy to damage。

As long as the power supply is replaced in time, the same is true when the components are damaged.

When the TV can't be turned on, you try to gently pat the TV to see if the TV can be lit, if the TV can be turned on, it means that the wiring board of the TV has a place to be welded. At this time, as long as the wiring board of the TV is re-welded, the fault that the TV cannot be turned on will be eliminated.

It may be that the protection circuit of the TV is faulty,At this time, as long as the fuse tube of the TV is replaced,But if the screen of the TV does not respond,It may be that the phenomenon of the TV is broken,This is to find a professional to repair the TV。

The TV has a power indicator that is the general reason and treatment method for not being able to turn on:

1. Check whether you have pressed the [Power] button of the TV remote control to turn off the screen display of the TV, so that the TV is in [standby state], you can press the [Power] button of the remote control again to start the screen and return to normal;

2. Check whether there is a problem with the signal source input of the TV, such as whether the connection between the TV and the cable TV signal, digital TV signal or *** machine is normal, after the normal connection, switch the TV to the corresponding signal source mode to return to normal;

3. After the above methods are checked, the TV still does not respond, and it is generally judged that the hardware failure of the TV causes the TV to be unresponsive, including the failure of the motherboard switch circuit, the failure of the screen wiring, the failure of the screen, the failure of other components, etc.; It is recommended to contact the after-sales service of the TV for a comprehensive inspection and warranty of the TV.

2.The power supply circuit of the TV is abnormal. Solution: Inspect and repair the power circuit part of the TV.

The set-top box does not turn on, resulting in no image and sound output for the TV. Solution: Turn on the set-top box.

5.The backlight plate of the TV screen is broken or other special circumstances.

6.The screen driver circuit inside the TV has a fault caused by virtual welding.

7.The AD board in the TV controls the high-voltage board switch part of the circuit is burned out.

Question: The remote control does not respond.

Question: I just changed the battery, the light of the remote control flashed, I was watching TV before, it seems that I accidentally pressed the key of the remote control, and I unplugged the power when I couldn't turn it off, and I couldn't turn it on again.

Question: When the TV is plugged in, the light is on.

The red button at the top of the center.

The question is right, that is, the boot button is not easy to press.

The TV power light is on and you can't turn it on, check the remote control first,If the remote control is normal, the motherboard is faulty。 If there is a bright light on the screen after turning on and you can't watch the program, it is a system problem, and you have to reinstall the system.

In this case, there is a high probability that there is a problem with the power supply of the TV. Try to restart the machine, if the fault persists, it means that there is indeed a problem with the power supply of the TV, which will cause the power indicator of the TV to turn on, but it cannot be turned on.

The power light can only indicate that the standby power supply is normal, and the main circuit is not necessarily normal.

The power light of the TV is on, but it can't be turned on.

Hello, glad to be able to your question. The reasons and solutions for the TV power light to be on are as follows:The general reasons and solutions for the TV to have a power indicator light are not turned on:

1. Check whether you have pressed the [Power] button of the TV remote control to turn off the screen display of the TV, so that the TV is in [standby state], you can press the [Power] button of the remote control again to start the screen and return to normal; 2. Check whether there is a problem with the signal source input of the TV, such as whether the connection between the TV and the cable TV signal, digital TV signal or *** machine is normal, after the normal connection, switch the TV to the corresponding signal source mode to return to normal; 3. After the above methods are checked, the TV still does not respond, and it is generally judged that the hardware failure of the TV causes the TV to be unresponsive, including the failure of the motherboard switch circuit, the failure of the screen wiring, the failure of the screen, the failure of other components, etc.; It is recommended to contact the after-sales service of the TV for a comprehensive inspection and warranty of the TV.

The TV won't turn on, and the power light won't turn on.

1. The power adapter of the TV is broken. Solution: Replace the TV's power adapter.

2. The power supply circuit of the TV is abnormal. Solution: Inspect and repair the power circuit part of the TV.

3. The TV is switched to other signal sources that are inconsistent with the ** signal output by the set-top box. Solution: Press the "Input Signal" button of the TV remote control and switch to the ** source that is consistent with the set-top box.

4. The set-top box is not turned on, resulting in no image and sound output on the TV. Solution: Turn on the set-top box.

5. The backlight plate of the TV screen is broken or other special circumstances. 6. The screen drive circuit inside the TV has a fault caused by virtual welding. 7. The switch circuit of the AD board in the TV is burned out.

1. The TV has turned on the child lock. In order to prevent children from turning on at will, some TVs are designed with a child lock function. 2. Power failure.

The power light is on, which only means that the electricity has been sent to the machine, but the power supply to the whole machine may be faulty. 3. The protection circuit of the TV is started. If the circuit has a short circuit or leakage fault, in order to protect the safety, protect the start of the circuit.

4. Other circuit faults.

Solution: 1. Find the manual and press the unlock button to unlock the child lock.

2. You can use a multimeter to check whether the switching power supply has an output and whether the voltage is normal, if the output voltage is abnormal, it means that the main power supply is faulty and reconnected.

3. If the protection circuit is started, the fault may be the fault of the main circuit board of the TV, or it may be the fault of the power supply itself, carefully identify and deal with it.

4. Usually, the probability of multiple faults occurring at the same time is very small, and it is analyzed and found one by one in the order of electricity, light, pictures and sounds.

Expansion: The role of the power supply: The power supply is a device that provides electrical energy, which can convert other forms of energy into electrical energy.

An electrical appliance is a device that consumes electrical energy and converts it into other forms of energy. The working principle of the power supply is to convert the 220V alternating current into the pure and low-voltage direct current required by the equipment, the process is very complicated, behind the key to the opening of the base, there is the existence of the voltage resistor, the principle is exactly the same as the principle of the fuse used at home, when the output terminal is too short-circuited current, there is a self-fusing way to cut off the current to avoid damage to other equipment.

The TV can't be turned on + the power is on.

1. Remote destruction of the closed control problem The TV remote control fails or the power is insufficient, first use the remote control to turn on, if it is invalid, try to press the channel button of the TV to verify whether the remote control is a problem. 2. TV hardware failure If it still can't be turned on, it means that it is caused by the hardware failure of the TV, including: 1. The power supply system failure of the TV is abnormal, or due to the short-circuit fault of a device in the main circuit on the motherboard, the power protection action causes the machine to not be turned on.

2. The failure of the high-voltage package of the TV causes the screen to be displayed without delay, and it does not disturb the machine. 3. The internal circuit of the TV is short-circuited. 4. The TV picture tube is faulty, the TV cannot be turned on, and the display image fails.

If it is caused by the failure of the TV hardware, it is not recommended that the user repair it by himself, but should contact the TV after-sales maintenance personnel to check.