Technical description and composition of the SUPRA STV-LC32T850WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32T850WL
Chassis / Version: V1N11
Panel: LVW320CSOT E45 V1
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 (RT7738)
MainBoard: 40-MT31BP-MAA2LG
IC MainBoard: CPU: MT5531NDNT; SPI Flash: 25Q64F; SOUND: RT9108NB
Tuner: 07-600C13-SA2G ST34WN-2T-E
STV-LC32T850WL Specifications
SUPRA STV-LC32T850WL
General recommendations for TV LCD LED repair
Repair of the SUPRA STV-LC32T850WL TV should start with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Sometimes, based on the visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements begin. Elements with visible damage, for example, capacitors swollen after electrolyte boiling, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master to guess the causes and possible consequences of the malfunction.
Malfunctions of a power supply module can be expressed in different ways, for example, SUPRA STV-LC32T850WL does not turn on at all and the control lamps on its front panel do not light up or blink, all signs of operability are absent. It should be noted that the processor power regulator (converter) may be faulty with the same external manifestations. Diagnostics and repair of the common power supply should always begin with checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the mains rectifier, as well as the large electrolytic capacitor of the mains rectifier filter.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM regulator microcircuit are subject to verification, which it is desirable to check by replacement.
If SUPRA STV-LC32T850WL has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the LED circuit of the backlight of the LVW320CSOT E45 V1 panel, 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.
It is often necessary to disassemble the panel to check the health of the LEDs, as well as the contact connections in the connectors and solders.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source.
The 40-MT31BP-MAA2LG motherboard should be checked if there is no response to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing SPI Flash elements: The GD25Q64 requires the necessary training and professional skills to repair modules at the component level. Problems associated with BGA soldering technologies can be diagnosed by the warm-up method.
If you suspect a malfunction of the 07-600C13-SA2G ST34WN-2T-E tuner, first of all, you need to make sure that there is a supply voltage at the corresponding output of the tuner.
Remember! Attempts to repair the SUPRA STV-LC32T850WL 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 FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32T850WL V1N11, Main: 40-MT31BP-MAA2LG, Panel: LVW320CSOT E45 V1
The appearance of the MainBoard 40-MT31BP-MAA2LG is shown in the figure below:40-MT31BP-MAA2LG
40-MT31BP-MAA2LG can be used in TVs:
ERISSON 32LET82 (Panel LVW320CSOT E145 V2), ERISSON 32LET42T2 (Panel LVW320CSOT E274 V2), ERISSON 32LET41T2 (Panel LVW320CS0T E274 V2), FUSION FLTV-32T21 (Panel LVW320CZOT), SUPRA STV-LC32T420WL (Panel LVW320CSOT E155 V2), SUPRA STV-LC32T850WL (Panel LVW320CSOT E45 V1), SUPRA STV-LC28T662WL (Panel T8-28T3520-LPM20), SUPRA STV-LC24T850WL (Panel 720p HD 1366x768), TELEFUNKEN TF-LED32S29T2 (Panel LVW320CS0T E198 V4), TELEFUNKEN TF-LED24S29T2 (Panel V236BJ1-LE2 Rev.C1), THOMSON T24E12DHU-01B T24E12DHU (Panel LVW240AUDX E2 V6).
Main features of SUPRA STV-LC32T850WL device:
Installed matrix (LED-panel) LVW320CSOT E45 V1.
To power the backlight LEDs, a converter combined with the 40-MT31BP-MAA2LG main board is used, controlled by the MP3398A PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using PWM SOT23-6 (RT7738) microcircuits.
MainBoard - the main board (motherboard) is a 40-MT31BP-MAA2LG module, using CPU chips: MT5531NDNT; SPI Flash: 25Q64F; SOUND: RT9108NB and others.
Tuner 07-600C13-SA2G ST34WN-2T-E provides reception of TV programs and tuning to channels.
SUPRA LED TV STV-LC32T850WL with LCD LVW320CSOT, 32 "(81 cm) 16: 9 diagonal. The required screen brightness of 280 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 80000: 1 is achieved by special LED control depending on the illumination of the areas in the scene.The model's display technology uses 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 (HD Ready) .Input high-frequency or video signal is decoded in analog PAL, SECAM, NTSC systems Graphic processing and digital signal formation is performed in 480i, 480p, 576i, 576p, 720p, 1080i standards Supported multimedia file formats: MP3, MPEG4, Xvid, DivX, MKV, JPEG.
Speaker power 10 W (2x5 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, audio x2, component, SCART, RGB, VGA, HDMI x2, MHL. 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 the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 732x492x190 mm, Without stand 732x442x59 mm.
TV weight: 6.7 kg.
Attention! The panel LVW320CSOT E45 V1 of the SUPRA STV-LC32T850WL LED TV is an expensive and unreliable element.
Avoid 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.