Technical description and composition of the SUPRA STV-LC39T820FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC39T820FL
Panel: TC390FP01-B
MainBoard: T.MSD309.9B 10345
IC MainBoard: CPU: MSD309BT-Z1, FLASH: GD25Q32
Tuner: XDTT-6F1C / T1146
STV-LC39T820FL Specifications
SUPRA STV-LC39T820FL
General recommendations for TV LCD LED repair
It is advisable to start repairing the SUPRA STV-LC39T820FL TV with a careful external examination of both internal and external elements. Based on visible external changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of a defect before taking the necessary measurements. Charred paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering on the leads of heating elements or transformers can often suggest the causes of the defect and possible consequences.
If the TV does not turn on, none of the indicators on its front panel are on or blinking. Also, if the TV does not respond to the remote control and buttons, does not emit any sounds or any signs of operability when turned on, there is a certain probability that the power module is faulty and needs repair. Sometimes a problem with similar manifestations can occur only in the absence of processor power, which is typical for certain SUPRA models. In general, first of all, it is necessary to check the electrolytic capacitors of the filters of the secondary rectifiers and the fuse at the mains input. If it is cut off, then the diodes of the rectifier bridge and the key transistor of the converter, which can be located either on a separate radiator or integrated with a PWM controller into a common microcircuit, should be checked for PN-transition breakdown. Options are possible.
It should be remembered that in the practice of repair, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dry electrolytic capacitors or broken resistors in the primary circuit, or the PWM controller microcircuit itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If SUPRA STV-LC39T820FL does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the LED circuit of the TC390FP01-B panel backlight or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power supply filter of the LED driver itself, including in the secondary rectifier of the main power supply unit.
In most cases when there is no backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or more LEDs do not work in one line, therefore, they are punctured and should be replaced.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes.
If the motherboard T.MSD309.9B 10345 is faulty, first of all it is necessary to check all linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes it is possible to check the health of the MB only by replacing it.
Repair of the board and replacement of CPU: MSD309BT-Z1, FLASH: GD25Q32 microcircuits are made with the necessary equipment and the corresponding element base. Malfunctions associated with the use of BGA soldering technologies can be localized by warming up.
If there is no tuning to local TV channels, you should make sure that the supply voltage of the varicaps (30-33V) and other supply voltages are present at the XDTT-6F1C / T1146 tuner terminals.
Remember! Attempts to repair the SUPRA STV-LC39T820FL TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC39T820FL, Main: T.MSD309.9B 10345, Panel: TC390FP01-B
The appearance of the MainBoard T.MSD309.9B is shown in the figure below:
T.MSD309.9B
The MainBoard T.MSD309.9B uses the MSD309B processor, DDRAM random access memory (RAM) in BGA design and SPI Flash ROM of 25Q32 type (4Mb).
It is advisable to start repairing the motherboard with checking the voltage converters and linear stabilizers necessary to provide power to the nodes in the operating and standby mode. The processor core is powered by + 1.5V. Also, the processor requires + 2.5V and + 3.3V voltages.
If the display backlight is working properly and there is no image, it is necessary to check the panel power supply (depending on the type, + 5V or + 12V), which is more convenient to measure directly at the LVDS connector. If, with all the supply voltages present, the TV does not go into operation, does not respond to the Remote Control and control buttons, you should update the SPI Flash firmware.
T.MSD309.9B can be used in TVs:
BBK LEM3242DT (Panel LC320EXN SDA1), BBK LEM3241FDT (Panel 32 "), BBK LEM2687FDT (Panel V260H1-LE1), IZUMI TLE32D400B (Panel V315H3-LE4), SUPRA STV-LC3245LF (Panel TC-315F1H2), SUPRA STV-LC39T820FL (Panel TC390FP01-B), SUPRA STV-LC46T810FL (Panel 1080p Full HD 1920x1080), SUPRA STV-LC39T810FL (Panel TC390FP01-A).
Main features of SUPRA STV-LC39T820FL device:
Installed matrix (LED panel) TC390FP01-B.
The necessary supply voltages for all nodes of the SUPRA STV-LC39T820FL TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a T.MSD309.9B module, using CPU chips: MSD309BT-Z1, FLASH: GD25Q32 and others.
Tuner XDTT-6F1C / T1146 provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC39T820FL with LCD TC390FP01-B, 39 "(99 cm) diagonal, 16: 9. The required brightness of the screen 350 cd / m² is provided by LED backlight. Dynamic contrast ratio of 60,000: 1 is achieved by special control operation of LEDs depending on the illumination of areas in the scene.This model uses an LED-panel with an edge arrangement of backlighting LEDs - Edge LED.The TV capabilities provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution in the standard 1080p (Full HD ) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG.
Speaker power 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, SCART, RGB, VGA, HDMI x4, USB. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768, 1920x1080. The digital tuner is capable of receiving TV channels in DVB-T MPEG4 standards.
The power consumed by the TV in operating mode from the mains is 100 watts.
Overall dimensions: 888x608x277 mm.
TV weight: 13 kg.
Attention! The panel TC390FP01-B LED TV SUPRA STV-LC39T820FL 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.