So, you have decided to purchase a DVD player. Now there are a lot of varieties of DVD players and the problem of choice is acute.
When you ask the manager for advice in the store, he begins to litter with obscure technical terms and try to sell the model more expensive.
You can of course take an expensive model from a well-known manufacturer (Sony, Philips, Panasonic, JVC, LG, Toshiba, Sharp), but this is not a good solution to the problem. In five minutes, after reading this article, you can understand new technologies and consciously make a choice.
What is a DVD?
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.
DVD player is a device that allows you to read DVD discs. In addition, he can read regular drives, MP3, DivX, VideoCD, JPEG, etc.
Well, and I began to pour in obscure terms. Let's try to understand the terms.
Technologies.
Under ordinaryCD meant discs from the music center. They are also called AudioCD.
MP3 - music format. You may have seen CDs marked MP3. This format allows you to hold up to 12 hours of music on one CD, which is its advantage.
Wma same as MP3.
Divx - the format in which the video is recorded on a CD. Up to 1.5 hours of video per disk. 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 take discs from them and watch on your DVD (if the player supports this format). In addition, such discs are cheaper than DVDs, although the quality is lower.
Videocd - old video format. One film fits on two discs at a quality comparable to VHS.
Jpeg is a format for photographs and drawings that can be recorded on 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, so you and your friends can sing your favorite songs.
DD 5.1 - so this technology is abbreviated as price list. Full name DolbyDigital. This is the sound format used to create the effect of presence. Have you been to the cinemas? Here DolbyDigital will allow you to create your home theater. The 5.1 prefix means that you can connect a 5.1 speaker system consisting of five small speakers (satellites) and one large speaker (subwoofer). Why already six columns, you ask? Five satellites create a spatial effect, and a subwoofer reproduces realistic bass.
Home cinema - This term is often used to name a DVD player with DolbyDigital support and DolbyDigital speaker system. The conclusion suggests itself: if there is not enough money for a complete set, you can first take a DVD player, and then buy an speaker system.
Varieties of DVD Players
Dvd changer- about the same as the original CD changer. Say, if you want, without getting up off the couch to watch all the episodes of your favorite series.
DVD + VHS VCR- DVD player and VCR in one housing. The main advantage is compactness. When choosing this unit, please note that both devices are controlled from one remote control, which complicates the management. Also, when recording from DVD disc You lose 2-7 seconds on a videotape, 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 in one case. Complete such a device with passive speakers, connect to a TV, and get a ready-made home theater. The disadvantage is the inability to improve the system in terms of sound power. The obvious advantage is the cheapness of the finished solution.
DVD recorders - with the ability to record. You can program the recording of an interesting movie or program. You can also transfer your home video collection to compact and durable DVD discs.
Buyer Tips.
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 selectable for TV.
If you have a simple TV with a diagonal of 21``, then you should not buy a super-designed DVD player for it. You will not feel the joy of high image quality.
Pay attention to the connectors that your TV is equipped with (if necessary, see the instructions). From which connector the DVD player will be connected, the image quality will greatly depend. I will list from the highest quality to the lowest: component signal input, S-video, SCART, composite signal input.
It’s good if your TV is equipped with a SCART connector. In this case, the DVD player must also have SCART. SCART is a universal connector; video, sound and control signals are transmitted through it. In this case, just one SCART-SCART cord is enough to connect, which will save you from confusion from various wires.
Audio system.
You can take a turnkey home theater solution, or buy a DVD player and speakers separately. This issue also needs to be resolved before purchase. DVD player.
If you have a dear with support DD 5.1, then the acoustics should choose the appropriate. Do not overdo it with the power of the speaker system. If the room in which the home theater will be installed is small, then a total power of 140 watts is enough. Connect the AV receiver (amplifier) \u200b\u200bto the DVD player is an optical cord, this will give a higher sound quality.
For an inexpensive DVD player, at first, the acoustics built into the TV will be enough. Not everyone can afford to immediately throw $ 200-500 at 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, digital camera memory cards, etc.)?
- Do you need a karaoke function (cheap models may not support this format)?
Now for shopping:
Have you decided what you need? An approximate image of your future purchase has already been drawn.
Feel free to go to the store. Questions and terms of managers now download you.
Instruction manual
Determine the nature of the malfunction by its symptoms. For example, if the player does not turn on at all, the power supply is faulty; if it turns on, but does not show “signs of life” (the tray does not extend, there is no video signal, etc.) - the signal processing board is “to blame”; and if everything works, but data from disks is not read, the problem lies in the mechanical part.
Disconnect the player from the network, TV and all other devices. Keep it off for an hour to discharge all capacitors. After that, remove the cover from the player. First of all, pay attention to electrolytic capacitors. If some of them are swollen, replace them with exactly the same ones (both in capacitance and voltage), observing the polarity. Close the player and check the device. If nothing has changed, turn it off again and wait one hour before the next autopsy.
If the replacement of the capacitors did not resolve the problem, find on the online auctions a faulty player of the same model, which is sold “for parts”. It must be spoiled, not the component to be replaced, but any other. Get the device, and then install in your player a working unit, taken from the "donor". Carefully check that after replacing all connectors are correctly connected and all screws are installed.
If the power supply fails, but the same could not be found, use the most low-power computer unit that can be found. It will not fit inside the player, so place it outside. Between the green and black wires, install a regular switch - with them you will turn the player on and off. On the signal processing board it is usually signed which voltages are to be supplied to where. The power supply has a black wire - common, on red there is +5 V voltage, on yellow +12 V, and on orange +3.3 V. Do not allow short circuits, especially at the last of these outputs - it is not equipped with protection.
Assemble the player in the reverse order and start using it.
DVD players today are still very popular, despite the fact that more and more people prefer to watch movies online on computers. But like any technique, DVD players tend to break. Users often encounter such a situation when the player cannot detect the disk and cannot read information from it with, it would seem, its full health. Any owner of a DVD player can handle this problem.
DVD players are an integral attribute of modern life. Like any other technique DVD players requires careful handling and care. Regular care will help extend the life of your DVD player and avoid premature repair. DVD care includes periodic cleaning of the lenses with a special cleaning disc. Also need regular clean the case DVD player from dust and dirt, since one of the reasons that record player ceases read discsare dust accumulations. It is not recommended to use the player near a radiator. Install DVD players it is necessary so that air access to ventilation openings is provided. In must be used, recommended by the manufacturer.When trying to watch a movie or listen to music dVD drive does not see the disk and writes insert disc. Maybe, dvd drive do not support reading some disk formats. To more accurately determine the problem, you need to know the drive model and disk format, which dvd drive does not see.
When reading data from a disk, the servo system of the laser head is initially turned on at full power (the maximum current flows through the laser diode). Further, the power is reduced to the level necessary for the normal functioning of the servo system of the laser head. When using low-quality or defective disks, the servo system always works at maximum, as a result, maximum currents flow through the focusing and tracking coils, causing them to overheat. When using low-quality discs, the DVD player often "freezes", the operation of the laser head becomes uncontrolled. If the DVD player “freezes”, it is not recommended to keep it in this state for a long time, you need to turn off the power or click on “reset”. To extend the life of the laser head of a DVD player, it is recommended to use only high-quality discs.
Workshop by repair dvd players is in center Moscowon the street Gilyarovskogo, has a convenient location in the immediate vicinity of the metro station Peace Avenue.
In our workshop can execute repair dvd players such brands as: Jvc, Sony, Panasonic, Philips, lg, bbk, elenberg, pioneer, toshiba.
Masters repair most malfunctioning DVD players: engine repair (replacement), power supply repair, laser optics cleaning.
Repair DVD player without spare parts
Main DVD issues and troubleshooting
Before moving on to the main topic, we will familiarize ourselves with the main malfunctions, signs and methods for their elimination.
The main causes of DVD / CD player malfunctions include:
- failure of the laser head;
- failure of the spindle motor;
- in rare cases, the decoder board;
As a rule, the device stops reading discs of any of the supported player formats, or stops reading MP3 and DVD formats, starts to play some moments with a slowdown, or displays a message: “NO DISK”, after pressing the “OPEN” key the carriage leaves and the disk continues to rotate .
Basically, these faults are eliminated by replacing the faulty component or module. In rare cases, you can do with cleaning the laser head.
You can repair the DVD player yourself using only the following accessories and devices:
- standard screwdriver set;
- simplest ohmmeter;
- cotton wool and alcohol;
- machine oil;
DVD player repair algorithm
Without a service manual, I developed the following repair algorithm.
Checking the resistance of motor windings. A working motor must have a resistance of 12 ohms. If the resistance is below 4-6 Ohms, remove the engine, disassemble it, clean the brushes and collector contacts. Then grease the motor shaft. If it doesn’t help, go to the next item.
Head cleaning. We wrap a piece of cotton wool on a match, moisten it with alcohol and carefully clean it. We make sure that no cotton wool fibers remain on the head.
Laser current adjustment. We will consider this item in more detail. At first glance, this may seem ridiculous to you, and someone will say how it is possible without special measuring equipment, but believe that 80% of the faults are eliminated by this particular adjustment. And so on in more detail.
On the board of the laser head, most often in the vicinity of the loop mount connector there is a variable resistor, the same one that adjusts the laser current. In most cases, you can get to it without disassembling the CD mechanism. sometimes it’s more convenient to do this by setting the laser head in the extreme position. In some cases, disassembly is required. We find a suitable screwdriver. We remember in what position is the resistor slider.
- 3.1. Slowly carefully rotate the resistor slider about 1-2 degrees clockwise;
- 3.2. Then we connect all the cables and wires (if they were disconnected);
- 3.3. We install a disk with a format that was not read in this unit or was read intermittently. Press “PLAY”. If the device did not read discs at all, it is recommended to install an Audio CD format disc;
- 3.4.Wait for 20-30 seconds (let the laser focus);
- 3.5. If it does not help, repeat paragraph 3.1-3.4.
- 3.6.If repeating paragraphs 3.1-3.4 several times (usually from 2 to 5) does not lead to any results, it is advisable to return the resistor slider to the position in which it was before adjustment and perform the same operations only by turning it counterclockwise.
After several such settings, you can quickly configure the laser in 1-2 minutes without any problems, without special measuring equipment and without a service manual-service manual.
If all else fails, your laser head is probably completely out of order. But as a rule, this happens very rarely. Any laser that has become very hardened can be made to read at least Audio CDs.
Article author: Anymanuals Project Manager
If you have a broken Chinese DVD player - do not rush to carry it in the trash if you are not married. If you are married, then, on the contrary, hurry up to avoid long philosophical conversations on the topics “what are the necessary things” and “lie down a bit - how much is this?”
The Chinese player is a source of various nishtyakov. For example, a ready-made IR receiver (and if you managed to not sow the remote control from the player, then a transmitter) to build remote control systems of startling meaninglessness:
Yes, this black little thing with three legs. With pleasure he eats parcels from any remote control, giving out a luxurious TTL / CMOS compatible pulse at the output. Inside, by the way, the black little thing contains a rather complicated circuit, including AGC and a band-pass filter.
Or, for example, here’s such a breathtaking vacuum-luminescent display that just asks to be embedded somewhere in an electro-punk craft 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 the garden from a pack of high-voltage transistors of non-obvious polarity, and for power they need something about 24-27 volts. Well, the second, suppose, you can somehow make it using PWM and IRF630 with a throttle ... and the first does not present a problem if you look at the back of the board:
The modest microcircuit PT6312 is the controller for such candy displays. Inside itself contains everything you need, and even more than that:
- controlled by SPI
- supports 6x4 button matrix
- able to do 8-step brightness control
- has 4 outputs for connecting LEDs (up to 20mA per channel)
- has 4 general purpose inputs
- It is functionally compatible with μpD16312 (FIG knows what it is, copied from a datasheet)
- placed in a convenient 44-pin LQFP case, quite suitable for LUT
A typical connection scheme does not look completely scary even for a graduate of an engineering and economic school:
The difficulty with all these treasures is exactly the same - to come up with what to adapt them to. Maybe it was really easier to throw right away.
If the DVD player is broken, it is not at all necessary to throw it away or carry it to the workshop and pay money for repairs. You can disassemble and even repair the device yourself.
The device and principle of operation of the DVD-player
The player consists of a housing with a tray for loading a disc. On the front panel of the case are: status display, player control buttons, on some models there may be connectors for connecting a microphone, headphones, flash drives. Inside the case, everything 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 the medium. A wide flexible loop connects the reading head to the base of the board. All disk media have the installation track necessary for proper operation. It is located in the center. When loading a disc, the laser shifts to the center to read this track. If the reading was successful, the presence of the disc is established, and only after that the rotation motor turns on and the disc starts to play.
Spindle drive motor
The motor interacts with the processor through the driver. The disk rotation speed depends on the processor signals.
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, and the tray loading and unloading engine.
DVD player circuit
Do-it-yourself repairs possible
“How many devices and wires! I’d better take him to the workshop! ”You say with horror, clutching your head. But! Do not rush to spend money. There are 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 basic and common. Remove the player cover and diagnose the power cord for internal damage. To check the operation of the multimeter, turn it on in the resistance measurement mode. We connect the probes to each other. If the device is OK, zeros will appear on the display. Open probes connect to the cord. One probe to the cable contact at the junction with the board, the other in turn to one of the plug contacts. If an ohmmeter outputs up to 3 Ohms, it lived without damage. If more, then there is a breakthrough in the vein, and the cord must be replaced. If the multimeter does not react in any way, then the contact on the plug and on the opposite end does not belong to one core of the electric wire. It is not recommended to use the multimeter in the 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 capacitors. If no visual problems are found and replacing the wire does not change the situation, take the player to a workshop.
The video below shows how the multimeter works.
How to ring a wire
If discs cannot be read
Consider the main causes of failure and how to deal with them.
Head malfunction
Reasons: the laser head is dirty or the laser is out of order.
A contaminated head is purged with compressed air using a conventional rubber bulb. The lens is wiped with a cotton swab dipped in alcohol. Do not use solvents. Wipe very carefully with light movements. If cleaning is not enough, the head must be replaced.
Video Cleanup
Laser head replacement
Malfunction of a connecting loop
The train often breaks at 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, do a preliminary repair. We cut the place of damage with scissors. We remove the insulation layer with a knife or blade so as not to disturb the metal strips. If it does not work out accurately, 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 loop. We remove the blue plastic end plate from the trim and likewise glue it to the updated edge of the loop with super glue.
Video loopback recovery
Now that visually the loop seems to be intact, 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 call with one contact on the other side. If the contact rings with several, then there is a short circuit in the loop. If the contact does not ring with any other, then there is an open circuit in the loop. And in that, and in another case, the loop is not subject to use. It is necessary to replace it.
Engine malfunction
If the engine rotates unevenly or does not rotate, then it must be replaced with the nozzle.
Replacing a DVD engine with video
drive dvd drive
Change the belt and collect everything back. The video below shows a detailed replacement of the drive's computer drive. In a DVD player, we work similarly.
Cleaning, lubricating, changing the belt
If the player does not see the flash drive
Most flash drives are initially in NTFS format. You need to insert a USB flash drive into the computer, copy the necessary information to hDD, click on the USB flash drive with the right mouse button and select "Format". Next, we select the FAT 32 format, we agree that all data will be lost and click ok. If the DVD still does not see the USB flash drive, then the problem is in the electronics: the microcircuit may be 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 your device will not save you all the trouble. Firmware can Russify the 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 model of the device on the back cover. Go to the manufacturer’s official website and see the firmware for this model. If they exist, then download latest version to a computer, write it to a CD. Run the disc in the player. When the update is completed, an initial splash screen appears on the TV or player screen, and the disc tray automatically pops out.
Complex damage
In addition to the problems that can be fixed by any user who knows how to work with a screwdriver and pliers, there are no less common, but more complex problems:
- display backlight does not work;
- sound distortion;
- no image and sound;
- no image or sound;
- the karaoke mode does not work;
- missing color image;
- complex mechanical damage, including water ingress;
- power controller failure;
- chip failure.
There are many manufacturers of DVD players. The principle of operation and the main elements of the devices are the same. Therefore, the repair of players different manufacturers is similar. If you want to try to repair the player yourself, go for it. 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 engage in radio technology and open your own business.
