Technical description and composition of the SUPRA STV-LC32LT0012W TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC32LT0012W
Chassis / Version: V1T06
Panel: VVH32L147G22LTY
LED driver (backlight): integrated into MainBoard
PWM LED driver: 8pin
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: CV512H-U42
IC MainBoard: SPI Flash: W25Q64
Tuner: CDT-9NT372-RD60
STV-LC32LT0012W Specifications
SUPRA STV-LC32LT0012W
General recommendations for TV LCD LED repair
Possible manifestations of defects
- SUPRA STV-LC32LT0012W does not turn on, does not respond to buttons and the remote control, indicators on the front panel do not light or flash.
A malfunction in such cases should be primarily looked for in the power elements of a switching power supply (SMPS) - a mains voltage converter (AC / DC), which in this TV model is combined with the MainBoard CV512H-U42 main board. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches (TO-252) and the rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) PWM SOT23-6, if they have no visible damage to the case and an open short circuit between the pins, are usually checked by replacing.
- No picture, sound, all other TV functions work. When turned on, the image may sometimes appear for a second.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. Most often the reason for this is a break in the LEDs, or poor contact in the connectors of the brackets, less often the LED driver may be faulty.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light a single 3V LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off, or pierced in the K / Z.
- The indicator on the front panel blinks, the TV does not turn on in operating mode, does not respond to the remote control.
Repair or diagnostics of the CV512H-U42 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). When repairing an MB board, you need to check its SPI Flash components: W25Q64. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as that the supply voltages on the outputs of the CDT-9NT372-RD60 tuner match. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
We remind users again! Attempts to repair the SUPRA STV-LC32LT0012W TV on your own without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC32LT0012W V1T06, Main: CV512H-U42, Panel: VVH32L147G22LTY
The appearance of the MainBoard CV512H-U42 is shown in the figure below:CV512H-U42
CV512H-U42 can be used in TVs:
DEXP H39D7000Q (Panel LC390TA2A), SUPRA STV-LC32LT0010W (Panel KM0320LDRH0037).
Main features of SUPRA STV-LC32LT0012W device:
Installed matrix (LED panel) VVH32L147G22LTY.
To power the backlight LEDs, a converter combined with the CV512H-U42 main board is used, controlled by an 8pin 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 CV512H-U42 module, using SPI Flash chips: W25Q64 and others.
The CDT-9NT372-RD60 tuner provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC32LT0012W with LCD VVH32L147G22LTY, 32 "(81 cm) 16: 9. depending on the illumination of the areas in the scene.The display technology of the model 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 standard of graphic decomposition 720p (HD Ready) .Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), 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, VGA, HDMI x3, MHL, USB x2. 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: without stand 735x433x74 mm.
Attention! The VVH32L147G22LTY panel of the SUPRA STV-LC32LT0012W 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.