[ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]SERVICE MENU
Hello dear visitors!
Once you're here, so either you - technician in search of entry into the service menu TV
or the overly curious Internet users.
If this is the second case, I would not advise you to seize control with the intention of
fix all the better for your favorite box. Most likely, you'll spoil
and then just ditch the TV and on some modern TV you
can choose the type of control so that more of your TV remote controlled
will not. Therefore, calm yourself with the thought that an experienced technician accesses
with the service menu for you, and better is not.
* * *
And now:What is the service menu
At present all the main TV control, both operational and
factory, are made by remote control
central control processor. Electrical Circuitry
Management consists of a central microcontroller (CPU), a device
remote control (remote control receiver infrared remote control), the keyboard control unit
display unit and an external memory chip.
The main control unit serves as a central microcontroller, whose task
is the receive signals and data, process them and send to the slave
manageable blocks. Subordinate units may be different
dedicated LSI (controller scan, sound, video controller, etc.).
The relationship between the main processor and subordinate units
done through a single digital bus control.
External commands go to a central controller with remote
remote control, and they first deciphered in
receiver-decoder control, or with the television (TV keyboard).
Display unit is used to indicate different modes of operation
system, providing control of these modes in its regulation. System
Display is a digital indicator or goes directly to the
display device (OSD - On Screen Display, the display is on screen).
In a memory chip to record some adjusting constants
(Data). In addition, some data are unchanged and fixed atsetting up the factory. These data are needed for normal operation
TV and they are not visible to the consumer, because the loss of the data
lead to loss of control of the machine. Access to these memory cells
data is possible only in the so-called factory or service operation.
An example of such data may be data on the geometric
screen size, white balance, the frequency of rejection, status, and duration
gating pulses, etc. Other data capture the various functions
device (the choice of standard, hotel mode, teletext language, a "lock" for
children, etc.) and stored in the memory cell, called the optional bytes.
Access to the same memory locations where data on the frequencies are set at
channels, analog level adjustment (brightness, contrast, color
saturation, volume, etc) are available to the consumer and can be adjusted
at the request of the consumer. As memory is used
non-volatile reprogrammable ROM (EEPROM). Communication Products
memory with the main controller is also carried by digitalbus.
If you need to replace a memory chip with a new, run
initialization of the memory, ie, introduce some identification data,
help ensure the efficiency of the device. These
setting data are in the ROM of the CPU and move to
a new memory chip special command from the remote control in the service
menu. After initialization, the memory must perform the desired
adjust the main parameters of the machine. Process of setting up TV service
menu is largely similar to the usual setting in user mode
but requires little skill to master.
Returning previously described can find out the general principle of the unit
management. When you turn on TV in the operating mode is to reset all the
chips connected together digital bus. Master reset
is the signal RESET, which begins after the programming
these chips. The options from the main processor draws
non-volatile memory and transfers the appropriate circuits. After
desired programming controller will handle the externalcommands from the remote, including command control mode, for example,
service menu. As stated above, the relationship between the main
microcontroller with slave devices is carried out through
digital bus. There are many different digital tire, but
the most common of these is the so-called two-wire
Bus PC (Inter IC, ie, between the chips), created by PHILIPS.
Briefly clarify the procedure for interaction chips connected together
the digital bus. For example, consider the structural diagram of the device
control apparatus CK3373TR firm SAMSUNG.
In this model, the system configuration and management is applied
microcontroller type SZM-137 company ZILOG (or SPM-151/153/161RV firm
PHILIPS). microcontroller controls the SZM-137 video processor M52309SP,
adjusting the values such as delay in the AGC, Contrast, Brightness,
saturation, image size in the vertical alignment of the image
horizontally and vertically on a vertical slope, etc.
Chip non-volatile memory (EEPROM) type H24S04R has inside