After the shelves of electronics stores were flooded with cheap Chinese-made DVD players, these wonderful devices immediately appeared on the repair table.
As practice shows, malfunctions of DVD players are mostly of the same type.
If the malfunction of the DVD player is “No disk"(No disc),"Error”(Error), random freezes during playback, the disc does not load the first time (only after several attempts), the disc does not spin up, then you need to pay attention to the following details of the player.
One of the most common processors used in the manufacture of DVD players is the processor MT1389 or its analogues.
If it gets very hot during operation, then, most likely, the 1.8V and 3.3V power stabilizers, which power the processor itself, are faulty.
In practice, there was a case that the MT1389 processor heats up, but the DVD player regularly plays music from CD / MP3 discs. I refused to read DVD discs. It turned out that the 1.8V and 3.3V stabilizers were assembled according to a simplified scheme on transistors, which did not ensure proper stabilization of the processor supply voltage.
Video (click to play).
As a result of a short-term surge in the voltage of the 220V supply network, the overvoltage passed to the processor, and it began to work with glitches and heat up like a kettle. On the board of the switching power supply, a burned out (but serviceable!) Low-power resistor was found in the voltage stabilization circuit. This is how simplified circuitry shortens the life of an ordinary DVD player.
A defective processor makes it difficult to diagnose a breakdown and, therefore, repair the device. In most cases, if the processor malfunctions, the DVD player cannot be repaired, as the repair costs can be very significant. In addition to the financial costs of buying a new processor, the problem of replacing a faulty one arises, since special equipment is required for dismantling / mounting.
Laser reader
The laser reader is the Achilles heel of DVD players. Laser service life is 3 - 5 years... But this period is declared by the manufacturer.
Usually, with prolonged and frequent use of DVD, rapid degradation (aging) of the laser diode and contamination of the optical elements of the reader occur.
As a rule, a malfunction associated with the inoperability of the laser reader is eliminated by replacing it. Replacing the laser is simple but not cheap.
Here is a list of interchangeable DVD laser readers:
It is worth noting that one of the most common and fairly easy to eliminate malfunctions is the contamination of the lens of the laser reader. Sometimes it is enough just to clean the lens and the device starts working properly. I have already talked in more detail about typical malfunctions of laser drives on the pages of the site.
Spindle motor
If the rotation speed of the DVD disc is not constant, with frequent jerks and slowdowns, then the problem may be related to the motor or driver.
Spindle drive faults are sometimes difficult to detect.The fact is that the engine is in good working order, but due to wear it gives out understated revs. In disc players disk rotation speed is linear, it is constantly monitored by the processor, which sends commands to the driver. But the engine is so worn out that no speed control system can handle it. Usually, in this case, DVDs are not loaded the first time, random freezes occur during playback, the disc does not spin at all.
With such defects, it is advisable to replace spindle motor... The one that turns the disc.
Spindle motor is better replace with the table on which to install the disc. If only the motor is replaced, then the height of the table installation on the motor shaft should be measured.
This is due to the fact that distance from laser disc to laser reader must be within some acceptable range otherwise, the focusing system will not be able to focus the laser beam on the surface of the disc.
If you install the table on the motor shaft "from the bulldozer", then freezes or even impossibility of playback are possible. Sometimes, after an incorrect table setting, the player reads CD / MP3 discs perfectly, but difficulties arise with DVD playback. The disk may load every other time, freeze or not be detected at all.
Therefore, before replacing the motor, we measure the installation height of the table, and after repair, we check the DVD-player for correct reading of discs of various formats (DVD, CD Audio, CD / MP3, DVD-R / RW, etc.). This recommendation also applies to the repair of car CDs / MP3 players and videol.
Motors with the following markings are very often used in DVD players:
MORF300CA287 RF-300F-12350 D / V 5.9 (D / V 5.9 - stands for 5.9 Volt DC motor - infa for the curious
)
The driver is a microcircuit that controls the spindle drive, the positioning motor (the one that rolls the laser head), the laser lens focusing coil, the disk loading / unloading motor, in general, all the mechanics. The driver receives commands from the processor.
Usually, if the driver is faulty, then it gets very hot. In this case, malfunctions of mechanical components appear (problems of loading / unloading the disc tray, the disc does not spin up, there is no positioning of the laser reader)
It should be noted that during operation the driver heats up (after all, it is an amplifying element), but if the temperature of the case is clearly too high (the finger is already burning!), Then the driver itself is more likely to be faulty. Also, excessive heating can be associated with a malfunction of any engine. If the drive consumes excessive current, then this can lead to strong heating of the driver microcircuit.
The most common driver chips are:
BA5954FP (can be labeled as AZ5954M, C5954, CD5954 - all these are analogs);
SA9259 (full analogue of the microcircuit - IP4001).
Replacing a faulty driver is quite troublesome, since these microcircuits have a planar case, which makes it difficult to dismantle them with conventional soldering equipment. To dismantle the driver chip, it is best to use a hot air soldering station (hot air gun) and Rose alloy to reduce the melting temperature of the solder.
For mounting a new driver microcircuit on a board, a soldering station with a tip of a suitable profile is quite suitable.
“Your DVD Doesn't Read Discs, Has It Stopped Being Included At All? What to do? Throw Out and Buy New? Take it to the Service Center and Pay for the Repair More than Half of Its Cost? I Offer An Alternative: Master DVD Repair Your Own Hands! ”
"To learn not just" how "or the method of the so-called" butt ", but to study everything at a professional level, and in an understandable language both for an experienced electronics repairman and for a beginner!" “Is it worth it to“ sweat ”over one DVD-player? Study something there, and what if it won't come in handy at all? Well, first of all, it will definitely come in handy! We live now in an era where knowledge of electronics is simply necessary, if not for you, then for your children and grandchildren for sure! ” “Secondly, who said that the knowledge and personal experience that I offer you will only be needed to repair one or two DVD-players?”
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After completing the course, you will be able to apply the acquired knowledge not only for personal purposes, but also organize a repair business.
The answer to this question lies on the surface. We are all surrounded by technology and it is difficult not to notice how from time to time something breaks down.
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After you insert any of the discs into the DVD drive of your computer, you will see the main navigation menu of the video course:
In this video, we outline a training plan for repairing DVD players. Let's talk about the necessary tools at hand, soldering accessories.
A digital multimeter is one of the main tools for an electronics engineer. He is the second hands, eyes, ears of the master. The fate of the repaired equipment depends on the ability to use a multimeter correctly.
The electronic components of modern household appliances are not what they were a couple of decades ago. The key point of any repair is the ability to distinguish elements by marking, to know the purpose and parameters.
In the first theoretical lesson, we will look at the general structure and layout of modern DVD players. Let's do an initial overview of what we'll be learning.
Most of all the malfunctions of DVD-players are caused by the mechanical part of the device. Here we will analyze the main functions and breakdowns of vehicles.
Engines, motors, motors, engines. Whatever you call them, this does not add to their reliability and durability. The role of the engine attachment and the pressure plate.
A flexible cable is an important element of any modern electronic device. In this lesson, we will look at the cables that are used in DVD players.
An optical converter is an essential element of any CD, DVD, BD disc player. 5 theoretical lessons are devoted specifically to the heads and how they work.
UPS is an integral part of any modern household and electronic equipment. Power supplies provide various devices with all the voltages necessary for their operation. Let's study their work.
In this tutorial series, we'll walk you through the essential part of any DVD player - the MPEG board. A module in which digital data is converted into analog signals.
Sometimes, when repairing a DVD with your own hands, you cannot do without a schematic diagram. It is necessary to be able to read diagrams even if you have already gained practical experience.
In the first practical lessons, we will change the DVD cables, as well as focus on some important points for replacing them, and in some cases for repairing them.
Optical converter is the most important element of CD, DVD-players. It is important to be able to properly clean the optics, because there are many nuances in this matter.
Several lessons are devoted to replacing the spindle motor. Using specific examples, we will learn how to defect engines, make replacements, including alternative ones.
Repairing DVD with “video freezes” malfunction. What is this problem, and how to solve it, we will consider with illustrative practical examples.
The device reads a CD, but does not read a DVD. and vice versa. What is the problem? Let's get acquainted with these malfunctions during the repair of several turntables.
Again, a lot of nuances and subtleties, which are very important to know. And nothing, except as a visual video with specific examples, will show you how to do it correctly.
Precise adjustment of the position of the laser head relative to the plane of the disc. For some examples, we will make adjustments using simple DVDs.
in 5 practical lessons we will analyze other minor breakdowns. Such as: problems with limit switches, "buggy" tray, height and runout of the spindle nozzle.
Consider the many DVD player power supply repairs and more. In the first lessons, we will focus on the breakdowns of the primary part of the switching power supply.
In the following video tutorials, we will look at power supplies with faults and problems associated with the output circuits of a switching power supply.
Also, using specific examples, we will analyze what other malfunctions there are in switching power supplies. Diagnostics of output voltages and some important points.
Some DVD breakdowns, and perhaps other equipment, can cleverly disguise themselves as some other malfunction. Which you can't guess! You just need to know.
The lesson on repairing the LCD-display of a portable "clamshell" clearly shows how to find faults that are complex at first glance by the method of elimination.
What is “cold soldering” or, as they say now, disconnect. For what reason it is formed and where it is most often hidden, you will learn from this lesson.
An oscilloscope, or as it is affectionately called a donkey, is an important tool on the desktop of any electronics engineer. Let's study the main points of using this device.
Let's analyze the malfunctions of the decoder board. Replacing and cleaning the EEPROM, replacing the bootloader driver, Replacing the stabilizers and setting the laser diode currents.
What "Progressive Scan" means How can this scan be confusing for the average user and what a wizard should know about it.
Like any modern technology, DVD players have their own software - software, or in simpler terms - firmware. The software sometimes crashes or needs updating.
In this lesson, we will order with you all the necessary spare parts from the online store. You will learn what to buy first and in what quantity.
Additional materials are not included in the course price and are a free application from the author's personal collection!
More than a thousand schemes, more than 90% of all DVD players. Despite the fact that all the equipment is built according to the same principle, Service manuals can be useful to you in any case.
This section of reference materials contains a large number of necessary links to various sites, forums, catalogs of datasheets, references on the encoding of SMD elements.
How to properly organize your business, what business model to choose and what pitfalls to beware of, you will learn from this lesson.
Despite the fact that the remote control is a fairly simple device, there are important points in its repair and maintenance, which cannot be neglected.
The mini-course consists of 5 lessons on the device, repair, cleaning and testing of remote controls.
First of all, you will receive knowledge that can bring you profit for many years!
You will learn how to use a digital multimeter, oscilloscope, and other instruments.
Each lesson contains the necessary first-hand advice.
After studying the material, you can make the most of it in the practice of repairing DVD players, gaining your own baggage of experience.
By purchasing a video course, you automatically acquire a membership of the "Virtual Workshop" club and will have discounts on subsequent products.
You will receive free author support in resolving your questions.
Service manuals for more than 1000 of the most common models of CD and DVD players.
You will have 2 excellent customer and technology accounting software.
You will receive a bonus mini-course "Repair the remote control yourself!" Who will teach you how to repair the remote control.
And of course, instructions for starting your own business in the service sector.
And remember that the investments made today will stay with you in the form of the knowledge gained forever!
I assume all responsibilities for the delivery of the disc, which will be packed in special protective packaging and sent to you within 24-48 hours. Even if in this case the disc arrives damaged or does not arrive at all, I will send you a copy again, and completely at my own expense.
Of course, the video course "Repair of DVD-players" is not the cheapest product on the network that you bought, but not the most expensive, it is the only one of its kind. Applying all the information that it contains in practice, you can master not only DVD player repair, but also repair of music centers, portable clamshells, as well as satellite receivers. The investment in the acquisition of this huge video course will seem like a trifle to you and will pay off with the first two or three clients.
