LG service manuals

How to determine the typical faults and carry out the TV repair?

If the TV is broken - it is almost always possible to repair. Often breakdowns causes lie "on the surface", and the TV repair with the right approach is not particularly difficult. I still do not recommend poking around on their own, but the typical faults and repair methods will describe - just to let you know what awaits you in the repair and did not let the master cheat yourself. So, I present a list of the most common problems.

Service manual
Service manual

The TV does not turn on or off


If the "box" is not included, and even the indicator does not light, the source of the problem is mainly the power supply. Often he will burn with voltage drops. The same reason causes spontaneous shutdown equipment. If the model provides protection against unstable voltage, at critical moments it will work and turn off equipment. We are confident that the differences were not? Then, the cause must be sought not only the power supply unit, but in the motherboard - it could appear microcracks. Read more: LG TV TROUBLESHOOTING

TV does not take remote control


Often there is a problem, which has two sources. The first and most common - remote fault. Suffice it fails to drop it or spill liquid on the keys, and it will cease to function. The reason may be more banal - just sat batteries (you will not believe how many times this factor people took for the "damage"). Quite possible that the remote to do with it, and causing the problem becomes a failed control receiver. If everything is in order - to blame, most likely the processor.

Disappeared memory


You are trying to save a list of preset channels, but nothing comes out. The probable cause of the problem can be memory devices. A similar problem: you save certain settings (for example, sound), but after the restart saving technology disappear. In any case, the TV should be aimed at diagnostic memory chip study. If the violation is confirmed - it must be easy to replace.

"Zero reaction" on the buttons


The TV does not respond when you press buttons on the control panel? Rather, the point of contact is broken between the button and the control of its job microcontroller. So first of all you need to check the contacts, and if everything is in order - look for the cause in the failure of the microcontroller CPU.

Poor quality sound


In most cases, the source of the problems with the sound becomes a speaker malfunction. So first of all you need to make sure they are properly connected and all contacts are in good condition. If the diagnosis showed excellent condition and speaker connections, but the problem remains - the reason should be sought in the functioning of the radio channel.

Image not available or the quality of the "limping"


It often happens: the TV is on, sound can be heard, but the "picture" is missing. The reasons for this failure are many: TV repairman in the diagnostic process to determine the true factor that caused the problem. By the way, almost the entire list of problems to solve real:

  1. Image not available, but the sound is - the reason for failure of the matrix or video amplifier.
  2. No image and sound periodically lost - this is likely to indicate a problem with the scan.
  3. The sound is present, the screen lights up, but nothing else happens - probably out of order video processor. There are also more banal reason - the noise in the tuner.
  4. Image not maximized to full screen - "symptom" damage surplus staffing matrix. Breakdown of personnel surplus module can be connected to the voltage instability or poor-quality operation of the power supply.
  5. The appearance of a narrow strip of the vertical position on the screen may indicate damage to the transformer urgent scan. Horizontal bars indicate the problem directly with the personnel scan.
  6. Missing color or monochrome image is turned into - performance breakdowns video amplifier or the video.

Issues matrix


It is in view of not cinematic, but a real matrix, set in modern TVs. The fault of this element is becoming a serious problem, since it can not be repaired, and will need to carry out the replacement. In essence, the matrix - a display element on which the image is built. Matrix can be broken for the following reasons:

● TV screen dropped or hit with a blunt object;

● Liquid has been spilled on the contacts of the matrix;

● installed the defective item;

● item worn as a result of long operation,

Personal injury matrix show multicolored stripes on the screen, the appearance of black circles, hang pictures or his disappearance. Diagnose and replace the matrix element must be an experienced master, since the process involves a lot of nuances (especially connections and settings).

Scan problem


On the vertical deflection problems Several factors point to the TV. In particular, this reduction or vertically offset image misalignment, the appearance of lines, the total lack of vertical deflection. In the latter case, only one horizontally arranged luminous bar is displayed on the screen.


The cause of all cases of failure can be malfunction vertical deflection generator block. The frequency sweep generator adjusts the set of electronic components. Therefore, to fix problems need to attract a person perfectly versed in design patterns.