Machinery

Why does the TV not turn on and off?, if the red indicator light is on or flashing

August 13, 2020

Breakdowns of television receivers, like any electronics, can be caused by various reasons, which are sometimes difficult to get to. Devices prone to failures are like new, and the former have been in operation for a long time. For example, trying to turn on the TV, you see the lights flashing, you hear a click, but the TV still does not turn on and does not work. Different device models may have their own "symptoms". The reasons for this, why doesn't the tv work, in fact there may be many.

Blinking indicators

Many modern models of television receivers have a self-diagnosis function. Before starting the device, the CPU checks all nodes and modules of the device for serviceability. When a breakdown is detected, the processor blocks activation and sends a signal with a fault code to the LED (the indicator blinks a certain number of times). If you notice, that is on the body of a Sony or Philips TV, Rubin television receiver, as well as Supra or Thompson flashing LEDs, this means, that he is self-diagnosing, and after some time will give the reason for the breakdown. The red indicator flashes a certain number of times, and these signals can be decoded, after looking at the instructions for the device, where all fault codes are listed, and what they mean.

Similar symptoms also appear when an LCD TV is connected to a computer as a monitor. If the PC turns off or is in sleep mode, then when trying to press the "ON" button on the MPC, the LCD TV will blink several times.

Blinking LEDs in a Sony TV can be caused by a failure in the software of the device or a problem in the system board. But first it is recommended to try flashing the unit. If that didn't help, and the TV continues to not respond to pressing the power button, then the problem is in the motherboard. If the Sharp TV does not turn on, at the same time, the sensors may light up alternately (red - 2 times, then green - 3 times), then this indicates the need to replace the backlight inverter.

Constant light of the indicator

When the indicator is on without blinking, this means, that the power supply is receiving voltage. But when the TV does not turn off from the remote control, try to turn it on with the button, located on the device body. Perhaps the reason lies in the remote control itself.

  1. First of all, when the TV stopped turning on from the remote control, it needs to change the batteries, and if oxidation of the contacts was noticed, clean them.
  2. After that check, the infrared emitter of the remote control is not broken, as it may cause that, that the TV does not turn on.
  3. It is also recommended to check the buttons for sticking. Specialists advise from time to time to disassemble the remote control and clean it of dirt. Dust can collect under the keys, and this is often the reason why, that the TV does not turn on with the remote control.
  4. If, if the unit is not turned on after that, as the remote control was filled with some kind of liquid - the latter is easier to replace with a new one.

When the Samsung TV, sharp, or philips could not be turned on from the panel, but at the same time the indicator lights up evenly, then this may indicate a failure in the software of the TV or in electronics - there is a malfunction in the motherboard. This requires diagnostics of the unit at the service center. Supra TV with a constantly burning red light, but lack of inclusion, the cause is most often faulty electrolytes in the BP.

The TV beeps

There are cases, when the TV beeps when turned on. When the whistle appears for a short time after switching on, then this indicates a faulty BZ (Power Supply). Condensers can cause such a sound, that have lost capacity. After some time of operation, the sound may become constant, which is a sign of rapid breakdown of the BZ.

If the LG TV does not turn on and at the same time starts to beep, then a more serious repair of the unit is required. BBK TV can also suffer such trouble, Sharp, Bravia, as well as Toshiba. The whistle may in this case be caused by the load in the secondary circuits due to:

  • burnt-out line transistor;
  • closed the capacitors;
  • the microcircuit of the lineman has failed.

In the case of a kinescope, example, TV Vityaz or Rubin, the TDKS often beeps due to cracks in the housing. This can happen during long-term operation of the unit. The sound is caused by the flow of a high-voltage discharge on neighboring elements. If replacing TDKS is problematic, then you can try to fill the problem area with epoxy-based glue.

In the Horizon TV, the kinescope can make a whistle when the suction cup is not properly attached, because of the dust accumulated under it.

Sharp 54CS transistor-03S

The TV does not turn on for a long time

After some time of use, the Philips TV may not turn on the first time. The TV is about to be turned on 3-4 minutes, and attempts can be from 10 and more. With, as soon as the image starts to appear on the screen, it clicks and turns off. Such symptoms are characteristic of Sharp devices as well, Thomson, Rubin and Deu. When the TV clicks and does not turn on, this indicates malfunctions of the capacitors of the power supply unit. After turning on the power, due to insufficient electrolyte capacity, BJ Phillips goes on defense.

The device is blocked after switching on

The blocking pattern can often be observed in Toshiba TV, and it doesn't matter if it's LCD or plasma TV. This happens as follows: included unit after completion 3-4 seconds goes to shutdown and is blocked, and a circle starts to burn in the upper left corner, and the TV does not show. To solve the problem, why the TV does not turn on, you must first measure the voltage on the system board. If the indicators are normal, it remains only to flash.