Technical description and composition of the TV SUPRA STV-LC24T820FL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC24T820FL
Chassis / Version: V2L12
Panel: TC236F101-A
LED driver (backlight): HTX-LP22020250
PWM LED driver: TL494G
Power Supply (PSU): Adapter 12V
MainBoard: T.MSD309.B61B
IC MainBoard: CPU: MSD309BT-Z1, FLASH: 25Q32BS, RAM: HSTQ1G630FR, SOUND: 1517P
Tuner: CD-9NT352-10
Control: RC13b
Technical Specifications STV-LC24T820FL
SUPRA STV-LC24T820FL
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs SUPRA STV-LC24T820FL, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
If the power supply module malfunctions, the external manifestations may be different, for example, the SUPRA STV-LC24T820FL does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be malfunctioning. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip or broken resistors in its bundle.
If there is no image when you turn on the SUPRA STV-LC24T820FL, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the TC236F101-A panel, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
When trying to identify a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
The motherboard T.MSD309.B61B should be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power stabilizers of the microcircuit are working, a software update may be necessary.
If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: MSD309BT-Z1, FLASH: 25Q32BS, RAM: HSTQ1G630FR, SOUND: 1517P. Defective components should be replaced.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the supply voltage of the varicaps of the tuner CD-9NT352-10, which is usually within 30-33V, as well as other supply voltages on the tuner terminals.
Once again, we remind users of TV: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC24T820FL V2L12, Main: T.MSD309.B61B, Panel: TC236F101-A
In case of failures in the software of SPI FLASH microcircuits made by Winbond, they can for some time restore their working capacity after temperature exposure - heating by a hairdryer of a soldering station or even a lighter. Usually this is enough to read the regular contents of the software. In such cases, the chip must be replaced with a new one.
Repair MainBoardThe appearance of MainBoard T.MSD309.B61B is shown in the figure below:
MainBoard T.MSD309.B61B uses the MSD309B processor, DDRAM in BGA memory and SPI Flash ROM of type 25Q32 (4Mb).
It is advisable to start the repair of the motherboard by checking the voltage converters and linear stabilizers necessary to provide power to the nodes in the operating and standby modes. The processor core is powered by a voltage of + 1.5V. Also, the processor requires voltage + 2.5V and + 3.3V.
If the display backlight is working properly and there is no image, it is necessary to check the panel power (depending on the type, + 5V or + 12V), which is more convenient to measure directly on the LVDS connector. If, in the presence of all the supply voltages, the TV does not enter the operating mode, does not respond to the Remote Control and control buttons, update the SPI Flash firmware.
T.MSD309.B61B can be used in TVs:
SUPRA STV-LC24T810FL (Panel TB236F101-A), SUPRA STV-LC24T820FL (Panel TC236F101-A).
Main features of the SUPRA STV-LC24T820FL device:
Installed matrix (LED panel) TC236F101-A.
The LED driver HTX-LP22020250 is used to power the backlight LEDs, it is controlled by the TL494G PWM controller.
To power all the internal nodes of the SUPRA STV-LC24T820FL TV, an external adapter 12V type source is used.
MainBoard - the main board (motherboard) is a module T.MSD309.B61B, using CPU chips: MSD309BT-Z1, FLASH: 25Q32BS, RAM: HSTQ1G630FR, SOUND: 1517P and others.
The tuner CD-9NT352-10 provides the reception of television programs and tuning to channels.
Information from an alternative source:
SUPRA STV-LC24T820FL Version V2L12
Panel Type (Matrix): TB236F101-A
Motherboard: T.MSD309.B61B, 25Q32BS, H5TQ1G630FR, AIC2565, YD1507P, Tuner: CDT-9NT352-10
T-con: HM236WU1-100 X0.0, MST7336F1-LF, 24C16, INVERTER: HTX-LP220103, TL494G, 9453, POWER: DC 12V; 3A
Remote control: RC13b
LED TV SUPRA STV-LC24T820FL with LCD display TC236F101-A, diagonal size 24 "(61 cm) 16: 9 format. The required brightness of the screen 250 cd / m² is provided by LED backlight LED. Dynamic contrast ratio of 20,000: 1 is achieved by special control LEDs work depending on the illuminated areas in the plot.In this model, an LED panel with an end arrangement of backlight LEDs is used - Edge LED.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD ). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, VGA, HDMI x2, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 36 watts.
Overall dimensions: 635x430x115 mm.
TV Weight: 6.8 kg.
Attention! The panel of the TC236F101-A SUPRA STV-LC24T820FL LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.