If you have a broken Chinese DVD player - do not rush to carry it in the trash if you are not married. If married, then, on the contrary, hurry to avoid long philosophical conversations on the topics "what are the right things" and "lie down a bit - how much?".
The Chinese player is a source of various nishtyakov. For example, a ready-made IR receiver (and if you managed not to sow the remote from the player, then the transmitter) to build remote control systems of astonishing meaninglessness:
Yes, here is this black little thing with three legs. I am happy to eat parcels from any console, giving a luxurious TTL / CMOS compatible pulse at the output. Inside itself, by the way, the black thing contains a rather complicated scheme, including AGC and a band-pass filter.
Or, for example, here is such a breathtaking vacuum-luminescent display, which simply asks to be embedded somewhere in the electro-bank crafts in the style of the 80s of the XX century:
With such displays, everything is fine, except that to control them you need to fence a vegetable garden from a pack of high-voltage transistors of unobvious polarity, and for power they need something around 24-27 volts. Well, let's say the second, you can somehow make with the help of PWM and IRF630 with a throttle ... and the first is not a problem if you look at the reverse side of the board:
The modest PT6312 chipset is the controller for such candy displays. Inside it contains everything you need, and even more:
- controlled by SPI
- supports 6x4 button matrix
- can do 8-step brightness control
- has 4 outputs for connecting LEDs (up to 20mA per channel)
- has 4 general purpose inputs
- interoperable with μpD16312 (FIG knows what it is, copied from datasheet)
- placed in a comfortable 44-pin LQFP package, quite suitable for LUT
A typical connection scheme is absolutely not scary, even for a graduate of an engineering and economics school:
The difficulty with all these treasures is exactly the same - to figure out what to adapt them to. Maybe it was really easier to throw it out right away.
If the DVD player is broken, it is not necessary to throw it away or carry it to the workshop and pay money for repairs. You can disassemble and even repair the device with your own hands.
The device and the principle of the DVD-player
The player consists of a case with a tray to load the disc. On the front panel of the case there are: a status display, player control buttons, on some models there may be connectors for connecting a microphone, headphones, flash drives. Inside the case is much more interesting.
Briefly about the main components of the device.
CPU
This is the main element of the player. It consumes electricity from a switching power supply.
Laser reading head
It is used to read information from media. A wide flexible cable connects the reading head to the main board. All disk media have an installation path necessary for proper operation. It is located in the center. When loading a disc, the laser shifts to the center in order to read this track. If the reading is successful, the presence of the disk is established, and only after that the rotation engine is turned on, and the disk starts to play.
Spindle drive motor
The motor communicates with the processor through the driver. The speed of rotation of the disk depends on the signals of the processor.
Driver
This is a microcircuit that receives commands from the processor and controls the operation of the spindle drive motor, the laser lens focusing coil, the laser reader displacement motor, the loading and unloading tray motor.
DVD player circuit
Is it possible to repair their own hands
“How many devices and wires! I'd rather take him to the workshop! ”- you will say with horror, clutching at his head. But! Do not rush to spend money. There are some breakdowns that can be easily identified and fixed with a conventional screwdriver.
If the player does not turn on
There can be many reasons. Consider the most elementary and common. Remove the cover of the player and diagnose internal damage to the power cord. To check the operation of the multimeter, we include it in the resistance measurement mode. Connect the probes together. If the device is working, then the display will show zeros. Open probes are attached to the cord. One probe to the contact of the cable at the junction with the board, the other one by one to one of the contacts of the plug. If the ohmmeter produces up to 3 Ohms, the vein is without damage. If more, then there is a breakthrough in the core, and the cord must be replaced. If the multimeter does not respond at all, then the contact on the plug and at the opposite end does not belong to one core of the electrical wire. It is not recommended to use the multimeter in dialing mode, as it operates in the range from 0 to several hundred Ohms. The next step is to inspect the presence of dust and swollen capacitors. We remove dust, we change condensers. If visual faults are not detected, and replacing the wire did not change the situation, take the player to the workshop.
The video below shows how a multimeter works.
How to ring the wire
If discs are not readable
Consider the main causes of failure and how to deal with them.
Head Fault
Causes: The laser head is dirty or the laser is out of order.
A contaminated head is blown with compressed air using an ordinary rubber bulb. The lens is wiped with a cotton swab moistened with alcohol. Do not use solvents. It is necessary to wipe very carefully with light movements. If cleaning is not enough, the head must be replaced.
Video cleaning
Laser head replacement
Malfunction of the connecting cable
The train often breaks on the folds. We disassemble the player in the same way as when servicing the laser head. Carefully pull out the cable from the plugs. Inspect. If there are visible breaks at the edges, and you do not want to change the cable completely, we do a preliminary repair. We cut off the place of damage with scissors. Remove the insulation layer with a knife or blade so as not to disturb the metal strips. If it does not work out neatly, then you can try to remove the insulation with a medical needle or zero sandpaper. The width of the removed layer should be the same as that of the cut piece of the plume. Remove the blue plastic end plate with a cut and similarly glue it onto the updated edge of the cable using super glue.
Recovery plume video
Now, when visually the train seems to be whole, we call its contacts. We connect one probe to the contact from one end, and the other in turn to all contacts from the other end. We do the same on the other side of the loop. Each contact must ring with one contact on the other side. If the contact calls with several, then there is a short circuit in the loop. If the contact does not ring with any other, then there is a break in the loop. And in fact, and in another case, the loop can not be used. It is necessary to replace it.
Engine malfunction
If the motor rotates irregularly or does not rotate, then it must be replaced along with the nozzle.
Replacing a DVD engine with video
passive dvd drive
Change belt and collect everything back. The video below shows a detailed replacement of the computer drive belt drive. We work in a DVD player in the same way.
Cleaning, lubrication, replacement passik
If the player does not see the flash drive
Most flash drives are initially NTFS. You need to insert the USB flash drive into your computer, copy the necessary information to the hard disk, right-click on the USB flash drive and select "Format". Next, select the format FAT 32, agree with the fact that all data will be lost and click ok. If the DVD still does not see the flash drive, then the problem is in the electronics: it is possible that the chips are damaged or the power supply in the wires or cables is broken. It is worth turning to professionals.
Can I flash a DVD player
Updating the device does not save you from all the problems. Firmware can Russify player. It will produce larger films, errors in reading supported formats will be eliminated. But the player will not be able to read formats that were not previously supported. Therefore, if the device works without lags, do not update it.
In order to find out whether it is possible to flash your DVD player, you need to carefully read the device model on the back cover. Go to the official website of the manufacturer and see the firmware for this model. If they exist, then download the latest version to a computer, write it to a CD. Run the disc in the player. When the update is complete, a splash screen appears on the TV or player, and the disc tray comes out automatically.
Difficult breakage
In addition to problems that can be corrected by any user who can work with a screwdriver and pliers, there are equally common, but more complex problems:
- display backlight does not work;
- sound distortion;
- no picture and sound;
- no picture or sound;
- karaoke mode does not work;
- color image missing;
- complex mechanical damage, including water ingress;
- power controller failure;
- failure of the chip.
There are many manufacturers of DVD players. The principle of operation and the basic elements of the device are the same. Therefore, the repair of players from different manufacturers is similar. If you want to try to repair the player yourself, go ahead. Perhaps you will succeed, and you will be able to help your friends another time. Or maybe you will like it so much that you will be engaged in radio engineering and open your business.
So, you decided to purchase a DVD player. Now there are a lot of varieties of DVD players and the problem of choice is acute.
When the store asks the manager of the council, he begins to litter obscure technical terms and try to sell the model more expensive.
Of course, you can take an expensive model from a famous manufacturer (Sony, Philips, Panasonic, JVC, LG, Toshiba, Sharp), but this is not the best way to solve the problem. It is possible in five minutes after reading this article to understand new technologies and make a conscious choice.
What is a DVD?
A DVD is an optical disc that is almost indistinguishable from a regular CD, but it holds 7 times more information. What it gives you: better sound and higher image quality.
A DVD player is a device that allows you to read DVD discs. In addition, it can read regular discs, MP3, DivX, VideoCD, JPEG, etc.
Well, and I began to pour in unintelligible terms. Let's try to understand the terms.
Technology.
Under ordinaryCD CDs were meant from the music center. They are also called AudioCD.
MP3 - music format. Perhaps you have come across CDs marked with MP3. This format allows you to hold up to 12 hours of music on one CD, which is its advantage.
Wma the same as MP3.
Divx - the format in which the video is recorded on a CD. Up to 1.5 hours of video on one disc. This is the format that came from the world of computers. What will it give you? If your friends have a computer, then you can borrow discs from them and watch them on your DVD (if the player supports this format). In addition, such discs are cheaper than DVD, although the quality is lower.
VideoCD - old video format. One film fits even on two discs with a quality comparable to VHS.
Jpeg - This is the format for photos and drawings that can be burned onto a CD. If your DVD player will support this format, then you can view photos in digital format, obtained from digital cameras, cameras, phones. Particularly advanced models are equipped with devices for taking photos directly from cameras and other devices, but this is a topic for a separate article.
Karaoke- well, everything is clear here. There is support, it means that you and your friends will be able to sing your favorite songs.
DD 5.1 - so this technology is abbreviated as called in the price lists. Full title DolbyDigital. This is the sound format used to create the effect of presence. In the cinema were? Here DolbyDigital will allow you to create your home theater. The prefix 5.1 means that you can connect a 5.1 speaker system consisting of five small speakers (satellites) and one big speaker (subwoofer). Why even six columns, you ask? Five satellites create a spatial effect, and the subwoofer reproduces realistic bass.
Home cinema - This term is often used to call a DVD player with Dolby Digital support and Dolby Digital speaker system. The conclusion is: if you do not have enough money for a full set, you can first take a DVD player, and then buy a speaker system.
Varieties of DVD players
Dvd changer- about the same as an ordinary CD changer. Say, if you want, without getting up from the couch, view all the series of your favorite series.
DVD + VHS VCR- DVD player and VCR in one package. The main advantage is compactness. When choosing this unit, please note that both devices are controlled from a single remote control, which leads to complication of control. Also, when recording from a DVD to a video tape, you will lose 2-7 seconds, despite the synchronous start function.
DVD receiver -a device that combines a DVD player, an AV decoder, a multi-channel power amplifier and a radio receiver in a single package. Complete such a device with passive speakers, connect to the TV, and get a ready-made home theater. The disadvantage is the inability to improve the system for sound power. A clear advantage - the cheapness of a turnkey solution.
DVD recorders - with the ability to record. You can program to record an interesting film or program. You can also rewrite home video collection on compact and durable DVD discs.
Tips for the buyer.
Now you have enough information not to be confused in terms. Before you run to the store, pay attention to a few more things.
DVD player is chosen for TV.
If you have a simple TV with a diagonal of 21``, then you shouldn’t buy a super DVD player. The joy of high-quality images you will not feel.
Pay attention to the connectors that your TV is equipped with (if necessary, see the instructions). The quality of the image will greatly depend on which connector the DVD player is connected to. I will list from the highest quality to the lower: component signal input, S-video, SCART, composite signal input.
Well, if your TV is equipped with a SCART connector. In this case, the DVD player must have a SCART. SCART is a universal connector, it transmits video, sound and control signals. In this case, all you need to connect is just one SCART-SCART cable, which will save you from confusion from different wires.
Audio system
You can take a ready-made home theater solution, or buy a DVD player and speakers separately. This issue also needs to be resolved before purchasing a DVD player.
If you are expensive with support DD 5.1then the acoustics should be chosen appropriate. Do not overdo the power of your speaker system. If the room in which the home theater will be installed is small, then a total power of 140 watts is sufficient. Connecting the AV receiver (amplifier) to the DVD player is an optical cable, it will give a higher sound quality.
For an inexpensive DVD player, the acoustics built into the television will be enough at first. Not everyone can afford to immediately throw away $ 200-500 to a home theater.
Functionality.
Decide what features you want to see in the DVD player.
- Do I need a recording function?
- Do I need a CD changer?
- Do I need to read data from digital devices (Bloototh, memory cards of digital cameras, etc.)?
- Do I need a karaoke function (cheap models may not support this format)?
Now shopping:
Have you already decided what you need? The approximate image of your future purchase has already drawn.
Feel free to go to the store. Questions and terms of managers now download you.
Today, when the cassette video players have already been thoroughly forgotten, and moviegoers, music lovers and karaoke parties have only increased, the choice of a good CD player is an important issue for many people. A CD player, also known as a DVD player, is a device for reading laser discs with image and sound output to one or several external devices. Even 15 years ago, any such disc player began to be called an SD-player. The name is still used. Now we will examine in detail how to choose a reliable DVD-player for a pleasant pastime.
How to choose a good DVD player
Any choice, including the choice of a good CD player, is associated with a clear awareness of its capabilities and needs. What is important to you? Exceptional picture and sound quality, the ability to play any video format, design, size, reliability, ease of use and customization. But if you do not know where to start, start with the TV. There are many options for where to start thinking through your choices. The starting point can be a manufacturer or functionality, it can be personal preferences. But if you remember where any DVD player pulls its wires, the answer becomes obvious. Most buyers already have a TV and you need to start choosing exactly with its capabilities. If you are a happy owner of a TV with a diagonal of more than 30 inches, then you should take a responsible approach to choosing a future CD player. Those shortcomings of the image, which the owner of a small screen will not notice, will be clearly visible for you, and can significantly spoil your mood. However, if the diagonal of the screen of your TV does not exceed 25 inches, then “budget” models of any decent brand, such as Pioneer and LG, are quite suitable for you. They are available ranging from 2000 to 5000 rubles. Separately, it is worth mentioning the sound. You can buy the best DVD player and bring the sound to the TV, but then you pay for what you don’t hear. Modern players allow you to transmit sound, divided by channel, creating surround sound. Even the ultramodern TV is not capable of it.
The main characteristics of DVD players
It doesn’t matter whether you are looking for the best CD player or inexpensive but good, it is always a good idea to first go through all the characteristics of CD players. They differ in:
- Characteristics of DACs: Quality directly depends on them. The important parameters are: sampling frequency - BH and bit depth - bit depth. It depends on the BH how fast the DVD player chip digitizes the signal and converts it to analog. Digit is responsible for the quality of the signal. The higher the BH and bit depth the better sound or video. The following D / A parameters are considered to be good: video - 12 bits, sampling frequency 108 MHz; audio - 24-bit resolution, 192 kHz sampling rate.
- Supported image enhancement technologies. Each CD player manufacturer boasts its own functions, but often they have just a different name and implementation. This aspect should be paid attention to especially picky film-lovers, as well as owners of huge modern TVs. In the specifications of each device, these technologies are spelled out, but trying to clarify this point with the seller is useless, it is better to look for information on the Internet itself.
- Supported formats: almost all devices on the market support audio formats: AAC, Audio CD, CD Text, MP3, WMA, DVD-Audio, Super Audio CD; video formats: MPEG4, DivX, MPEG1 and MPEG2; image formats: JPEG and PNG. Supporting such standards is a kind of standard, however, when you buy a DVD player, you should pay attention to them in the specifications, all of a sudden there will be no one you need.
Video Out
DVD player connectors are divided into two types: audio and video. Each of them is divided into two types: digital and analog. Analog video connectors have four varieties:
- Video 1RCA (composite) - analog composite input or output for direct connection to a TV. It is executed in the form of one wire and one connector. Weak in quality. The components of brightness and chromaticity in it are mixed (and therefore composite). Rarely found on the enclosures of CD players.
- S-Video (Separate Video) - analog component (components of brightness and chromaticity are separated) input / output. Direct connection to an external visualization device (TV, projector). It has one wire and one connector. Can be found on the body of almost any DVD player.
- SCART or Y / Pb / Pr - analog component audio / video input / output for direct connection to a visualization device. It is made as a single wire with a flat and wide connector.
- Video 3RCA or Y / Cb / Cr– analog component input or output. Direct connection to the visualization device. It has the cleanest and clearest signal of all analog. It can be made in the form of a cable with three wires and three connectors.
You can not get around and side digital connectors. On a DVD player, they are usually represented by DVI and HDMI interfaces. These are two relatively young types of digital connections that can only be connected to a compatible technology with a corresponding connection. Connection speed through such connectors is very high. They are designed to ensure interaction with computer equipment, therefore, have full compatibility with it. The HDMI interface also supports piracy copy protection. Without this standard now can not do any high-quality DVD-player.
What about audio?
Now remember what we talked about connecting audio. It is not necessary to output it from the DVD player to the TV, due to the weakness of the speaker system of the latter. Specially developed for DVD technologies are Dolby Digital and Digital Theater, which, in the presence of a good acoustic system, realize surround sound. So, the sound in the DVD is divided into 6 channels - they correspond to 6 analog output cables, and 6 speakers to which the cables lead. These are five columns: 2 front (right and left), 2 rear (right and left), center and subwoofer. A subwoofer is needed to reproduce the lowest frequencies, the rest are distributed in columns. The subwoofer is as if separated from all the others. Therefore, the systems are called six-channel and are denoted as 5.1. Now anyone, even a budget DVD player, supports this technology, and has on its back 6 holes for RCA cables, for each corresponding speaker. But the best sound quality is obtained with digital audio output to the amplifier. Of course, both the audio system and the CD player must have the necessary sockets for this.
