Repair LG TVs
- When turned on, the STANDBY LED601 first turns off and then lights up again.
- The device turns on, but after a while the image becomes distorted
- The TV does not turn on while in standby mode
- The appearance of a narrow horizontal strip on the screen
- Compressed image - violation of vertical linearity at the top of the screen
- No green in the image
- TV does not work
- Unable to adjust sound volume
- Image size increased vertically
- Spontaneous shutdown of the TV receiver
- Lack of color image
- White raster on the screen, shifted to the right, and on the left side - a strip of black
- No image, raster
- There is no switching of the TV to the operating mode from the standby
- Impaired color rendering in various color systems
- Reception and storage of programs only on the first channel
- Stock footage
This article provides an overview of typical failures for a foreign-made TV tube. Most failures can be repaired by a service center technician. Repair of LG TVs requires special equipment and certain skills. However, the owner of the TV device does not interfere with knowing at least the main malfunctions and their causes.
There are a lot of reasons why it may be necessary to repair LJI TVs. At the same time, we can distinguish those that users have to face most often. We will consider them below.
to contents ↑When turned on, the STANDBY LED601 first turns off and then lights up again.
The television receiver does not exit standby mode. The causes of damage can be:
- short circuit on the zener diode;
- bursting of the burst resistor.
You can fix the damage by replacing these elements.
to contents ↑Important! It should be noted that in most cases, breakdowns occur due to power surges. For expensive equipment it is better to use voltage stabilizers or line filters. Find out more on our helpful tips portal in a separate review. “Surge protectors for household appliances - rating”.
The device turns on, but after a while the image becomes distorted
In this case, the TV does not respond to commands from the remote control and front panel. There is also a spontaneous transition of the television receiver into standby mode.
The cause of the damage is a malfunction of the controller chip. In its replacement lies the repair of the LJI TV.
The TV does not turn on while in standby mode
In this case, the output voltages of the +115 and 18 V channels are approximately halved. The problem is the breakdown of the filter capacitor.
Repair LG TVs is to replace failed parts.
to contents ↑The appearance of a narrow horizontal strip on the screen
The cause of this failure is the failure of the capacitor in the power source.
To fix the problem is simple - replace the capacitor, and the repair of the LJI TV will be completed.
to contents ↑Compressed image - violation of vertical linearity at the top of the screen
If this is the situation you are observing with your equipment, the C406 capacitor has failed. It remains to replace the part with a working one.
No green in the image
To find out the cause of this phenomenon, check the device with an oscilloscope. Most likely, the microcircuit has failed.
to contents ↑TV does not work
IP switches to overcurrent protection mode - breakdown of the transistor of the output stage CP Q702.
You can fix the problem by replacing the transistor.
to contents ↑Unable to adjust sound volume
If you can’t change the sound settings in any way, or after the response the device gives incorrect values, the I121 chip is faulty, which needs to be replaced.
Image size increased vertically
In this case, you may notice too much image brightness. All this signals a malfunction of the capacitor C419.
to contents ↑Spontaneous shutdown of the TV receiver
Usually this is manifested by turning off the device after 5-10 minutes of operation, with switching to standby mode
In this case, problems with the Zener diode D651.
to contents ↑Lack of color image
There may still be a spontaneous increase in brightness with the same spontaneous switching to standby mode. Malfunction of the power supply stabilizer on the IC982 chip. The problem is solved by local repair of the LG TV by replacing the microcircuit.
White raster on the screen, shifted to the right, and on the left side - a strip of black
This phenomenon on your household appliance indicates a breakdown of the IC702 memory chip.
to contents ↑No image, raster
As a rule, on the right side of the screen is a vertically located black stripe of 100 mm. There is no OSD image. All this is a malfunction of the IC701 controller chip. A repair of the LJI TV will be to replace such a part.
to contents ↑There is no switching of the TV to the operating mode from the standby
If you observe just such a picture, a short circuit occurred on the transistor Q981 protection circuit.
Impaired color rendering in various color systems
The reason is the strong magnetization of the aperture grating of the picture tube. LG TV repair is as follows: fix the problem using an external demagnetizing loop.
to contents ↑Reception and storage of programs only on the first channel
If there is a delay when choosing any other channel - a memory chip malfunction, which must be replaced with a working one.
to contents ↑Stock footage
You can’t try to repair the TV without having any idea about its structure. Do not take risks, call the wizard. The information in the article will allow you to explain to the specialist what exactly happened to your television device, and he will correctly figure out the reasons and restore the performance of your equipment.
(No ratings yet)
Loading...