Why Samsung Galaxy A30 display does not work?
First steps and theory
The development of the mobile industry has taken the direction of increasing display size and minimizing the number of mechanical keys. The screen is the main way to control the device, and damage to it can turn your phone into a useless pile of metal. There are many options for disrupting the inoperability of the screen: from the appearance of small spots and defects, to its complete inoperability.
Each breakdown is unique and needs separate consideration. You must be sure of the reason for the inoperability, otherwise dishonest service workers can cash in on you. First of all, you need to make sure that everything is in order with the software part of your device. This requires:
Connect the charger to the device, let the battery charge a little
- Turn on the device. Connect mobile phone to computer
If the sync is successful and there are no changes on the screen. The problem is in the components. Let’s figure out the main causes of malfunctions in the operation of the mobile phone screen and explain them.
Broken screen control chip
Failure of microcircuits in the device is not uncommon. The screen does not receive the necessary information from the device and does not display an image. It is impossible to identify this problem with regular means, it will be determined at the service center. Breakage is corrected solely by replacing components.
Why the screen does not work on the phone. Reasons and explanations
In this article I will tell you about the reasons why the screen / display does not work on your phone, but what to do in this situation.
Let’s start in order.
- Moisture and liquid penetration into the phone case
- Broken screen control chip
- Loop worn or disconnected
- Broken pixels and spots on the screen
The phone screen does not work due to mechanical / physical damage
Every smartphone drop. A kind of lottery, everyone is lucky in different ways. One mobile phone may remain without a single scratch when dropped from a great height, and the other can fail if it unsuccessfully collides with a hard surface.
Mechanical damage is easily diagnosed with the naked eye. A growing crack appears on the phone screen, and often a “spider web”. There can be several outcomes in such a situation:
Damage to the protective glass and stable performance of the device
- Image display but sensor damage
- Complete screen breakage
Replacing a damaged protective glass depends on the device. Modern models are equipped with combined screens with a sensor and protective glass, which allows you to achieve a minimum thickness. Replacing such components is expensive and requires replacing not only the protective glass, but also other components. The same principle applies to a damaged sensor.
If the protective glass is damaged, but the screen works. This is not a reason to continue using this device. It is recommended to urgently contact the service center, because your phone becomes vulnerable to moisture and liquid, which can cause more serious damage.
Loop worn or disconnected
The flex cable connects the mobile phone screen to the device and is replaceable. This solution allows you to quickly replace the screen without interfering with the device board, but adds the ability to detach on impact. Connecting a loop will not take long and will not hit your pocket.
The wear of the cable is typical for clamshell phones and sliders. In such devices, constant physical contact is created when opening and closing, which eventually leads to a malfunctioning loop. In such cases, the replacement of the loop is performed at the service center and does not require the purchase of a screen module.
Moisture and liquid penetration into the phone case
Everyone knows from an early age that there is no place for water in electronics. If moisture or liquid gets into the phone, it will destroy the contact board, short circuits and other critical phenomena that disrupt the device’s performance.
Destruction of contacts on the board may require both routine cleaning and replacement of many components. If water gets into the device, it is recommended to immediately contact the service center for assistance. Water entering the mobile phone screen can cause characteristic streaks and stains, which can be corrected by replacing the screen or modules.
Why does a black screen appear on TV and sound works
Try to find out if your TV has a mute function. This is true for newer LCD / LED TVs such as:
Certain TVs have the ability to turn off the picture: this function allows you to listen to the sound of the TV or DVD player when the picture is turned off. Make sure not to enable this function.
But if we exclude all factors from the outside, then only the problem remains at the hardware level. Let’s see what’s the matter.
A common cause of malfunction of new TVs, due to which the image disappears when there is sound, is the failure of lamps or screen backlight LEDs.
The easiest way to determine whether the problem is in the backlight or not is: take any light source (lamp, hand-held flashlight or even a flashlight on your phone) and, with the TV turned on, bring the light source to the screen.
If you see that there is an image, but it is very difficult to see it, then your lamps or LED strip are out of order. Of course, there is a possibility that the color module, power supply, frame and line scan unit, tuner or matrix are out of order.
If you are not an expert in this matter, it is rather difficult to replace or repair the listed parts, therefore, this work should be carried out only by a TV repair specialist.
Proper handling of the TV is a guarantee of its long-term service!
Often equipment fails due to improper operation.
Unscrupulous attitude to the appearance of minor malfunctions, mechanical stress, penetration of moisture into the body, all this leads to wear of components, as a result of which malfunctions appear.
One of the most vulnerable spots in modern TVs is the inverter. This part fails quite often. The inverter is an expensive part, so a specialist will most often recommend repairing it rather than changing it. This problem, for which the picture is missing, is typical for TVs of LG and Samsung models.
Why is there a black screen on the TV, but the sound remains?
You faced this problem on TV: the TV screen is black, but there is sound. Naturally, due to this malfunction, viewing the programs is not possible. In this article, we’ll show you what to do about this problem. What caused the picture to disappear? Let’s look at the internal and external causes of the problem.
- To understand what is out of order, first: we look at the equipment. If the equipment is completely new, this malfunction may appear due to the manufacturer’s defect.
- If the device has served you for several years, there is a possibility that the batteries or backlights are out of order.
It follows from practice that the technology itself most often has absolutely nothing to do with it: this malfunction is not always the result of equipment failure. Uninterrupted image reproduction depends not only on internal elements (boards, circuits, blocks), but also on external ones (antenna cable, distribution box, etc.)
Don’t be discouraged if you just see a black screen when you turn on the TV.
There is a chance that the solution to the problem is very close:
- Antenna cable (cord);
- Distribution board;
- An external antenna located on the roof is the most vulnerable element in this problem.
Inspect these items, especially the plug. Basically, it is connected from the back to a special connector (socket).
First you need to pull it out of the connector and insert it back. There is a possibility that due to poor contact, the signal coming through the plug is weak. This could be one of the sources of image fading.
Next, you need to connect a second TV (of course, a working one) to the antenna wire in order to check the signal quality.
If, after connecting, a poor-quality signal began to arrive or there is simply no image, then most likely the problem is either in the external antenna or in the antenna cable.
If there is a problem with the external antenna, then it remains only to call the organization responsible for its maintenance.
What is the reason for the missing image on the TV screen connected via HDMI?
Let’s just superficially touch on the connection via HDMI of a computer to a TV. In rare cases, with this connection, the image may disappear quite often. The first thing to do is check the HDMI cable itself. Also check if hibernation is running on your computer.
The sound can also be played, but the picture will never be. Basically, everyone can cope with the connection via HDMI cable, and this is not a serious problem with a whole and working HDMI cable. But this issue has its own pitfalls that the user may encounter.
So what to do. If you do not have an image when connecting, check the cable for kinks, bends, breaks, if there is such damage, you need to replace the HDMI cable.
You also need to check the settings and make sure that the computer has not entered sleep mode. Another option is connector failure. In this case, you need to refer the technician for repair to specialists.
These are the main reasons due to which, when the TV is connected via HDMI, the image is not displayed.
Don’t forget to say “Thank you”, “Like” or repost to the author: