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Some aspects of the change in modern memory chips, TVs
Data analysis repair consumer electronics show, which often cause loss of efficiency of equipment and, in particular, from the time of television receivers, is the failure of the memory chip (EEPROM). In practice, there is complete or partial loss of working capacity EEPROM, as well as the distortion of the information they keep. Depending on the fault, in some cases makes it impossible to use the TV, but in many cases there is no complete failure of equipment, and just lost some functionality. In TV lineup beginning of the last century 90_h microprocessor control TV replaced the previously used mechanical analog controllers, and EEPROM remember only the basic values of analog parameters (the values for brightness, contrast, saturation, audio channel settings, program settings, etc.). In a more recent TV development (the vast majority of the models made in the last 5 years) in my memory also contains information about the configuration of a particular TV model and the individual preferences of different functional units. If the chip EEPROM has failed, for recovery of the TV and you want to record the initial parameters of the newly installed chip certain information. It can be made in the general case with the programming EEPROM. With its help you can also read the contents of the dismantled chip and write the new chip data read and write in it the basic firmware for this TV model from the database, which does not take into account individual parameters specific instance of the TV. Management systems of many TV manufacturers have in the service menu option to log into the base firmware EEPROM averaged parameters of the ROM chip. This simplifies the process of replacing the memory chips. To customize parameters in any case, correction of the memory content using the service menu. In the absence of this control for many TVs can specify your EEPROM content by writing specific values for each byte of memory bank or control specific parameters in service mode. But for this you need to at least know the procedure of entering the service mode. Below is a brief description of the methodology change memory chips and correct their information in some models.
Replacing the memory chips in televisions ORION.
It should be noted that the mass of cheap TVs in my memory, as a rule, only the values stored analog settings. And in case of failure EEPROM, usually accompanied by the inability newly tuned channel memory, enough to replace a faulty chip on the new and to tune the TV as instructed. Very Chato such a failure occurs in TV ORION different models, such as the 20 MS and 14J. To replace, you can also use chips with more memory. For example, in this case, instead of chips can be used 24S01 24S02 ... 24S08. In this case, just all the memory will not be used. Apply a replacement option for the other TVs. Criterion for such repairs, usually, is the presence on the panel tube trimmer potentiometers (at least 3_h) to adjust its operating modes. This suggests that the main modes of the tube and, perhaps, the entire video will be installed without the use of a microprocessor and memory.
Replacing the memory chips in the JVC TVs
Recently, cases of failure of EEPROM in TV JVC models S_21ZE, AV_21TE, AV_G21T c running time 5 ... 8 years. In all of these models use a memory chip type 24S04. The author does not claim to be an exhaustive listing of the external manifestations of the abnormal operation of the TV, focusing on the most common situations. In most cases in the chips out of order data channel. Thus, as a rule, the TV keeps working with a previous settings. In some cases, the failure of the tire chips accompanied by blocking SCL and SDA, which leads to a complete failure of the system of management. Such a fault can be
and also due to a malfunction of the microcontroller or video processor, but in such cases can not be directly with the maximum reliability the defective chip. Troubleshooting in this situation it is advisable to start with health check and replace EEPROM, as the most expensive components that can cause such trouble. But the replacement of defective chips in the new TV models listed does not lead immediately to restore their health, and vice versa, at first glance, only complicates the situation. TV becomes a uncontrollable, almost immediately after the warm-up and it is off the tube protection circuit. The reason is that in these models TVs EEPROM information on all settings of the video processor, including about the setup mode the picture tube. Due to the fact that in all the memory cells of new chips recorded value FF in hex (or 255 decimal), all adjusting the TV's settings are in a position, causing the maximum current-ray tube. This is the cause of a fault trip. If you can move the dump (Content) dismantled faulty memory chip in the newly installed with the help of the programmer, after this operation, performance TV returns fully to the conservation of earlier settings. In the absence of programmer can set the parameters described below to conduct the procedure. All of the following applies to the TV «JVC C_21ZE», but the look of the menu and its use for other models differ slightly. By deliberately not giving the full designation of adjustable parameters and methods for additional TV controls. More details are described in , . 1. Prior to the removal of chip EEPROM should be rewritten from the service menu items set the values of all the parameters used.
● To enter the service mode at the same time press the DISPLAY button on the remote control and the PICTURE MODE.
In this case, you should see the first page of the service menu, from which the transition to other pages by pressing the number keys 1-3);
1. VSM PRESET
2. SUB VSM
3. IF I / C
● Pressing the 1 page displays the preset picture settings preferred BRIGHT, STANDART and SOFT (Fig. 2);
● button 2 page displays picture settings for each color system separately (Fig. 3);
● click the page is called three settings tract drive and GPU:
● by pressing the DISPLAY PICTURE MODE and set the page is called system constants (Fig. 5);
● Return of the selected page to the main menu page, and the output of the service mode is accomplished with the MUTE.
2. Before turning on the TV set with a new chip to reduce the stress on the accelerating electrode tube to a minimum to prevent the protection system.
3. Turn on the TV and set the TV to spend according to what was previously considered data. All parameters are displayed in decimal. Choice of adjustable parameter and change the value is key
E PICTURE ADJUST. Keep in mind that when you change many settings there is an abrupt change in brightness to a minimum, so you may need to increase the value of the accelerating voltage to produce a visual change control parameters. If you make the adjustment parameters, selecting the page in sequence 4_3_2, then with frequent adjustment of the accelerating voltage practically required.
4. Set the nominal value of the accelerating voltage, visually monitoring the image. Without being able to read the original firmware EEPROM chip must be entered in the average values of the parameters shown in the figures for all menu items.
Service menu - it's certainly a big deal in the repair business, but ... At this time, amateur radio repair business a bit, so to speak, behind the modern technology, which in turn is walking with great strides. Without a computer repairman BREA not do. Virtually all firms supply in its service centers service manual on CD-ROM, which is beneficial, convenient, and very quickly. Reports on repairs service centers sent using e-mail and the Internet. The questions that arise from the mechanics of service centers can be set directly from the agency, where in a couple of a couple of hours you can get the information without which the continued maintenance would be impossible for a number of reasons ... ... My ear hurts when I hear when buying a memory chip, a master or owner of ham sent these same "masters", contact the seller with a request to sell memory 24S02SV1. The seller, who in principle should not know such details, digging in their price lists, usually states that there is no such or there, but supposedly the other firmware. Is even worse is when the press gets information that should not go there because it is sabotage.
SOLON Publisher series: Library repair "by VV Nazarov page 91. The book is called "360 practical shooting, Zap TV technician", I quote: «GoldStar GF-29C10P. Malfunction: 1 to 20 channel TV does not remember the program. The defect is associated with memory and at least a manifestation of its very unusual, the first thing I change memory chip H2402R. Such a chip in my presence there, I try 24S01V1. It works. "Dear master, hams, electricians - explain. Memory chips are, for example, the standard 12C (ie, 24S01, 24S02, 24S04, 24S08, 24S16, etc..), MicroWire (93C06, 93S46, 93S56, 93S66, 93S86, etc..), SPI (25S010, 25S020, 25S040, 25S080 ) and others. Within each group, they differ in the size of the internal memory. 12C for 01 = 128 bytes, 02 bytes = 256, 04 = 512 bytes, 08 = 1 KB, etc., but not necessarily more corresponds to a larger volume.
All this EEPROM - volatile memory. That standard memory EEPROM is most common in radio to store settings and options. So we, Telemaster or repairmen, collect or acquire programming that supported as many species or types of EEPROM.
To replace the memory: the memory can only be changed by a greater volume. Just in this case, the memory is not fully utilized, but only that part which refers to the processor. For example, you can change to the 24S01 24S02 24S16 ... but the price of the chip increases with the amount of internal memory. This should take into account differences in the protocol exchange, for example, can be replaced by 24S08 24S16, but not on 24S32. 93S56 93S66 can be replaced, but not on the 93S76.
Chips of some firms may differ in timing, protocol, and the appointment and pinout - then available only direct replacement. Sometimes it happens that the previous master (or producers) have already put large volume chip. In this case, the truth (if you really want to), will only service manual.
Thus, the memory is less clear now about firmware. Many of you may have already heard this strange word - firmware. What is it? This is the information that is sutured (recorded) programmer at the very memory chip.
The central processor interrogates memory during start up, and can also refer to it during the TV every few seconds. It all depends on the program being built into the processor itself. Management processor knows that at 0001A in memory stores information about the size of a raster, and at 00,019, what should be the scope signal red. The memory contains information about the frequency of line scanning, for example, in TV SONY.
Curious what the processor reads the memory, and incidentally reveal some defects will help the device under
called a logic analyzer (monitor bus).
Some manufacturers, for example, ERISSON, MIYOTA, PREMIER stitch to free space in the memory of the advertising.
Example - the TV firmware ERISSON 2108. Processor LA863328A, memory 24S04. Instead of brand name ERISSON I usually insert their phone company. Without an antenna on a blue background, and when the TV is turned yellow letters highlights our phone. Owner explains that it is a proprietary firmware from our studio, and none of the owners never angry. When we enter into the service menu and change something in it, the processor changes the values respectively in the memory cells. But this is not always possible. There are times when the menu option is simply impossible because the TV does not turn on or fills one of the primary colors. It happens in TV JVC, and pours green. See anything in the service menu is not possible due to the fact that the information on the menu the same green color.
When you connect the AC adapter TV right away. Raster lights, no graphics, sound, control buttons do not work.
In recent years, Russia began to deliver small color LCD TVs. Approximately 80% of what I had to do, was associated with a faulty firmware in memory chip. The list goes on and on. Variety of defects is striking. Methods of modern repair shop stationary begins with Altering a memory chip. I've been thinking ... how the workshops, which are still in service with no computer programming and firmware from different models? Talked with the masters of the various workshops - and all became clear ... The equipment sent unconditionally to service centers or shops like ours. But then why should the service menu? The service menu is used only for fine adjustments: geometric distortion of the raster, white balance, etc. matrixing Service menu - is nice ... but this is not the way out of the situation. Information is not always available on the service menu. Not always know how it go, how to change the value, how to remember. And it is likely to change the value of ignorance in the menu so that the TV that once worked, no longer even included and only pomigivaet svotodiodom. It happens: SONY TV owner procured on the market a book on the service menu, where information was available, just on his TV model. I wanted to correct raster correction yourself. He climbed into the service menu and began to play. Team-TT he turned on the TV PIP module, which in fact he had not been set. After another turn processor to check the information in the chip stitched in 1C 24S32, and then compared it with what he has on the bus. "Strange" - thought processor "module PIP something neovechaet probably broken) - and began blinking LEDs on the front of the TV, requiring the owner to call TV technician for repair. In such a situation may be even a novice master. Imagine how bad you will look in this situation? Yes, the owner behind wheezing, waiting, finally, his television work. Very frustrating! Out there - it can not be. You can drive and flash memory chips for the money to those who have a programmer and firmware for your model. And if the firmware will not work or go bad again, then go again. You can buy quilted memory chips. Repeated trip to the store is provided. And remember that sellers usually have little to understand this, they are the main sell. Collect programmer yourself. Free programmer with schemes and programs on the internet a lot. One but ... torment provided ... Free same. But to collect and try very possible.
[ buy for the money ready. My advice is to stop the programmer Orange-2 for $ 50 (to date it is withdrawn from production), and the sale of a new version of Orange-4. This is the latest version of the programmer, the family "Orange". The programmer is made by SMD technology. Four-protection against forgery. Software Windows 95/98/Me/NT/2000/XP (RUS, ENG). . The programmer is designed for TV technician. Works with all types of external circuits, which are found in TVs, VCRs, cameras, radios, stereo, phone, washing machine, microwave ovens and other household appliances. This programmer is used in many service centers around the world! Announced loudly, but it's true. The list of countries where the already hard working laborer orange (Orange-2): Lithuania, Latvia, Poland, Estonia, Germany, Spain, Georgia, Russia, Ukraine, Israel, Czech Republic, Belarus, Slovakia, Moldova, Hungary, the Philippines, Japan, Canada , Bulgaria and so on.
Приобрести за деньги готовый. Я советую остановится на программаторе Orange-2 по цене 50 долларов (на сегодняшний день он снят с производства), а в продаже новая версия Orange-4. Это новейшая версия программатора, семейства "Orange". Программатор выполнен по SMD технологии. Четырехступенчатая защита от подделки. Программное обеспечение Windows 95/98/Me/NT/2000/XP (RUS, ENG). . Программатор специально разработан для телемастеров. Работает со всеми внешними типами микросхем, которые встречаются в телевизорах, видеомагнитофонах, видеокамерах, магнитолах, музыкальных центрах, телефонах, стиральных машинках, СВЧ печах и другой бытовой технике. Этот программатор используется во многих сервисных центрах по всему миру! Заявлено громко, но это правда. Список стран, где уже вовсю трудится трудяга апельсин (Orange-2): Литва, Латвия, Польша, Эстония, Германия, Испания, Грузия, Россия, Украина, Израиль, Чехия, Белоруссия, Словакия, Молдавия, Венгрия, Филиппины, Япония, Канада, Болгария и тд.
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