Technical description and composition of the SUPRA STV-LC40T440FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40T440FL
Chassis / Version: V1R07
Panel: C400F15-E2-S (G01)
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP4012
MOSFET LED driver: MMD14N25
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 NCP1251
MainBoard: JUC7.820.00123957 (HLT57EJ)
IC MainBoard: CPU: 9206B, SPI Flash: GD25Q64
Tuner: CH DM121 C816RH
STV-LC40T440FL Specifications
SUPRA STV-LC40T440FL
General recommendations for TV LCD LED repair
Possible malfunctions
- SUPRA STV-LC40T440FL TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up or blink, the TV does not respond to the remote control and control buttons.
In such cases, the main power source, the AC / DC converter of the mains voltage, which is combined with the MainBoard JUC7.820.00123957, may be faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for possible partial or complete breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers PWM SOT23-6 NCP1251, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlighting. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the JUC7.820.00123957 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its CPU: 9206B, SPI Flash: GD25Q64 chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
If the TV operates normally from external devices, but does not tune to TV channels, the CH DM121 C816RH tuner may be faulty. In such cases, first of all, you should make sure that the supply voltage is present at its corresponding terminals. It is also necessary to make sure that the data exchange between the tuner and the processor is possible via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Once again, we remind TV users: do not attempt to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40T440FL V1R07, Main: JUC7.820.00123957 (HLT57EJ), Panel: C400F15-E2-S (G01)
The appearance of the MainBoard JUC7.820.00123957 is shown in the figure below:JUC7.820.00123957
JUC7.820.00123957 can be used in TVs:
DEXP F40B7200C (Panel C400F14-E6-C (G5)), SUPRA STV-LC40T440FL (Panel C400F15-E2-S (G01)), SUPRA STV-LC40T800FL (Panel C400F14-E8-C).
Main features of the SUPRA STV-LC40T440FL device:
Installed matrix (LED panel) C400F15-E2-S (G01).
To power the backlight LEDs, a converter combined with the JUC7.820.00123957 main board is used, controlled by the MP4012 PWM controller. The keys of the MMD14N25 type are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 NCP1251 chips.
MainBoard - the main board (motherboard) is a JUC7.820.00123957 module using CPU: 9206B chips, SPI Flash: GD25Q64 and others.
Tuner CH DM121 C816RH provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC40T440FL with LCD C400F15-E2-S, diagonal 40 "(102 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 100,000: 1 is achieved special control of the LEDs depending on the illumination of areas in the scene. The display technology of the model uses LED LED backlight. The TV's capabilities provide for viewing programs and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Supported formats multimedia files: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power of 16 W (2x8 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI x3, USB. A headphone output is provided. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 1235x758x284 mm, Without stand 713x435x86 mm.
Attention! Panel C400F15-E2-S (G01) SUPRA STV-LC40T440FL LED TV is an expensive and unreliable element.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV non-repairable.