Technical description and composition of the SUPRA STV-LC32T820WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32T820WL
Chassis / Version: V2L06
Panel: TP315BT01-B
LED backlight: 42LED 355mm X 2 MD315-5620TML-0607 (L / R)
T-CON: DUNTK5003ZZ PN; NT71168MFG, MAX17126, TP144
LED driver (backlight): integrated into PSU
PWM LED driver: BIT3251 // OB3350CP
MOSFET LED driver: D452, MDD1501, D478
Power Supply (PSU): MP123T-24TL
PWM Power: PWM SOT23-6 LD7535 // LD7750RGR
MainBoard: T.MSD309.BA1B
IC MainBoard: SPI FLASH GD25Q32
Tuner: CDT-9NT352-10
Control: Login to the service: MENU 1147 RC13b
STV-LC32T820WL Specifications
SUPRA STV-LC32T820WL
General recommendations for TV LCD LED repair
Repair of the SUPRA STV-LC32T820WL TV should begin with a careful external examination of all its components and modules. Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for searching for a defect before taking the necessary measurements at control points. If ring cracks are found in the soldering of the element terminals or broken connecting paths, swollen capacitors or charred resistors - all this may be characteristic signs of the causes or consequences of an already known typical malfunction.
In cases when the SUPRA STV-LC32T820WL TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operation when turned on, - most likely the power module is faulty or there is no power processor on the motherboard (typical defect of some SUPRA TV models). In the absence of swollen capacitors of the secondary rectifier filter, diagnostics of the power supply should begin with checking the fuse and, if it breaks, it is necessary first of all to check all power semiconductor elements of the primary circuit - diodes and transistors for the likelihood of an avalanche or thermal breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (SMPS) it does not fail by itself without reasons that should be looked for by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
In cases where the SUPRA STV-LC32T820WL TV has lost the image, but there is sound and all other functions are operational, there is a possibility of a malfunction of the LED driver (the converter for powering the backlight LEDs of the TP315BT01-B panel). When you turn on the TV, the image may appear briefly and immediately disappear. It should be borne in mind that with such manifestations, the LEDs themselves fail.
Often, in the absence of backlighting, disassembly of the panel is required. It is necessary to check the serviceability of the LED transitions, as well as the reliability of the contact connections in the lines and connectors.
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.
On the motherboard T.MSD309.BA1B, in case of a malfunction, you should first check the operability of all stabilizers or power converters of microcircuits and, if necessary, update the software (software).
If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - SPI FLASH GD25Q32. Defective components must be replaced.
Attention! Users and owners of STV-LC32T820WL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
In cases where the SPI FLASH software fails and a Winbond chip is installed, we recommend replacing it with a new one. Sometimes faulty SPI Winbond microcircuits can be temporarily restored after warming up with a hairdryer or a lighter, which makes it possible to read the installed software.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis MSD309B Schematic diagram
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32T820WL (V2L06), MAIN T.MSD309.BA1B, PANEL TP315BT01-B
The appearance of the MainBoard T.MSD309.BA1B is shown in the figure below:The MainBoard T.MSD309.BA1B 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.BA1B can be used in TVs:
SUPRA STV-LC32T820WL (Panel TP315BT01-B), SUPRA STV-LC32T810WL (Panel TP315BT01-A).
External view of the power supply
Main features of SUPRA STV-LC32T820WL device:
Installed matrix (LED panel) TP315BT01-B.
The matrix is controlled using the DUNTK5003ZZ Timing Controller (T-CON).
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the PWM controller BIT3251 // OB3350CP. D452, MDD1501, D478 keys are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC32T820WL TV is carried out by the MP123T-24TL power module, or its analogs using PWM SOT23-6 LD7535 or LD7750RGR microcircuits.
MainBoard - the main board (motherboard) is a T.MSD309.BA1B module, using SPI FLASH GD25Q32 chips and others.
The CDT-9NT352-10 tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32T820WL with LCD TP315BT01-B, 32 "(81 cm) 16: 9 diagonal. The required screen brightness of 350 cd / m² is provided by LED backlighting. 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.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) .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 20 W (2x10 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, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. 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 network is 50 watts.
Dimensions: With stand 400x320x150 mm, Without stand 400x275x40 mm.
Attention! The panel TP315BT01-B of the SUPRA STV-LC32T820WL 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.