Technical description and composition of the SUPRA STV-LC32LT0013W TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32LT0013W
Chassis / Version: V1T05
Panel: ST3151A05-8
T-CON: MT3151A05-5-XC-5
LED driver (backlight): integrated into MainBoard
PWM LED driver: SOT23-6
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: JUC7.820.00203490 HLS80JS
IC MainBoard: CPU: MSD3663LSA, SPI Flash: 25Q64
Tuner: ST18WM-2K-E
STV-LC32LT0013W Specifications
SUPRA STV-LC32LT0013W
General recommendations for TV LCD LED repair
Possible manifestations of defects
- SUPRA STV-LC32LT0013W TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
A malfunction in such cases should be looked for primarily in the circuit of a switching power supply (SMPS) - a converter (AC / DC) of the mains voltage, which is combined with the MainBoard JUC7.820.00203490 in this model. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches (TO-252) of the converters and rectifier diodes for the probability of a short circuit.
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, 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.
In such cases, the most likely malfunction of the LED panel backlighting elements. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or breakage), sometimes in the violation of the contact connections of the LED strips.
When trying to detect 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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the JUC7.820.00203490 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). If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU: MSD3663LSA, SPI Flash: 25Q64. Defective components must be replaced.
Before changing the ST18WM-2K-E tuner, if it is not possible to tune to television channels, you should make sure that there are supply voltages, which must be measured at the corresponding tuner terminals and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Attention! Users and owners of STV-LC32LT0013W TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32LT0013W V1T05, Main: JUC7.820.00203490 HLS80JS, Panel: ST3151A05-8
The appearance of the MainBoard JUC7.820.00203490 is shown in the figure below:JUC7.820.00203490
Main features of SUPRA STV-LC32LT0013W device:
Installed matrix (LED panel) ST3151A05-8.
Matrix control uses Timing Controller (T-CON) MT3151A05-5-XC-5.
To power the backlight LEDs, a converter combined with the JUC7.820.00203490 main board is used, controlled by the SOT23-6 PWM controller. TO-252 switches 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 SOT23-6 PWM microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a JUC7.820.00203490 module, using CPU chips: MSD3663LSA, SPI Flash: 25Q64 and others.
The ST18WM-2K-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CSOT
Model: ST3151A05-8
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: HVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 7.16% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 62%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LED TV SUPRA STV-LC32LT0013W with LCD ST3151A05-8, diagonal size 31.5 "(80 cm) 16: 9 format. The required screen brightness of 260 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 100,000: 1 is achieved by special control operation of LEDs depending on the illumination of areas in the scene.The model's display technology uses LED LED backlighting.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the 720p graphic resolution standard (HD Ready) .Supported media file formats: MP3, MPEG4, HEVC (H.265), 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, VGA, HDMI x3, USB. A headphone output is provided. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: with stand 731x482x195 mm, without stand 731x438x86 mm.
Attention! The ST3151A05-8 panel of the SUPRA STV-LC32LT0013W 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.