Technical description and composition of the SUPRA STV-LC32T662WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32T662WL
Chassis / Version: MT31BP
Panel: LVW320CSOT
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
Power Supply (PSU): integrated into MainBoard
PWM Power: RT7738F (PWM SOT23-6)
MainBoard: 40-MT31BP-MAA2LG MT31BP MIPE07R41 REV1.5
IC MainBoard: CPU: MT5531NDNT 1429-BCAH, SPI Flash: 25Q64F, SOUND: RT9108NB
Tuner: ST34WN-2T-E
STV-LC32T662WL Specifications
SUPRA STV-LC32T662WL
General recommendations for TV LCD LED repair
Possible manifestations of defects
- SUPRA STV-LC32T662WL TV does not turn on. There are no signs of operability. The indicators on the front panel do not light up or blink, the TV does not respond to the control buttons.
First of all, in such cases, you should make sure that the common switching power supply (SMPS) - the AC / DC voltage converter of the mains voltage - is working. All source elements in this TV model are located on the MainBoard 40-MT31BP-MAA2LG. Its output voltages should be measured and, in their absence, the power switches and rectifier diodes should be checked for the probability of a short circuit in the converters.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency in the short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) RT7738F (PWM SOT23-6), in the absence of external damage and short circuit between the terminals, are checked by replacing them with a known good one.
- No picture, sound, all other TV functions work. When turned on, the image may sometimes appear for a second.
As a rule, in such cases there is no display backlight. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power supply (LED driver).
To check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- 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 40-MT31BP-MAA2LG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board needs to be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MT5531NDNT 1429-BCAH, SPI Flash: 25Q64F, SOUND: MP3398A and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If the TV operates normally from external devices, but does not tune into TV channels, the ST34WN-2T-E tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the data exchange between the tuner and the processor is possible via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Attention to users! Self-repair of the SUPRA STV-LC32T662WL TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
SUPRA version STV-LC32T662WL V1N06, Main Board: 40-T31T0T-MAB2HG, Power: SHG3206A-101H
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32T662WL, Main: 40-T31TOT-MAB2HG, Panel: LWV320CSOT E45 V16 (T8-32T3520-LPM10)
Enter the service menu: the "menu" button on the control panel, image, contrast and enter the code 1950 or 9735.SUPRA STV-LC32T662WL V1N06 Chassis (Main Board): 40-T31T0T-MAB2HG
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-LC32T662WL device:
Installed matrix (LED-panel) LVW320CSOT.
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 RT7738F microcircuits (PWM SOT23-6).
MainBoard - the main board (motherboard) is a 40-MT31BP-MAA2LG module, using CPU chips: MT5531NDNT 1429-BCAH, SPI Flash: 25Q64F, SOUND: RT9108NB and others.
The ST34WN-2T-E tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32T662WL with LCD LWV320CSOT, 32 "(81 cm) 16: 9. The required brightness of the screen of 280 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 80000: 1 is achieved by a special control of the LEDs depending on the illumination of the 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). high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC.Graphic processing and digital signal shaping occurs in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards.Supported multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG ...
Speaker power of 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, VGA, HDMI x2, 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 television channels in the DVB-T, DVB-C, DVB-T2 standards.
Overall dimensions: 880x553x153 mm.
Attention! Panel LWV320CSOT E45 V16 (T8-32T3520-LPM10) SUPRA LED TV STV-LC32T662WL 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.