Technical description and composition of the SUPRA STV-LC40T400FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40T400FL
Chassis / Version: V1N11
Panel: 14Y_40VNBSR2LV0.1
LED backlight: 480 mA. - 3.3 Ohm = 400 mA
T-CON: 14Y_EF11_TA2C2LV0.1
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: HK-T.SP9202R53
IC MainBoard: CD25Q32B, NC5CB64M16FP-DH, MN88472 PS331, AD52580, FR9889
Tuner: NoName
Control: IR: 58-18B (S) -R
STV-LC40T400FL Specifications
SUPRA STV-LC40T400FL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV SUPRA STV-LC40T400FL does not turn on and does not show any signs of turning on, does not respond to control buttons and to the remote control.
In such cases, the AC / DC converter of the mains voltage, which is combined with the main board HK-T.SP9202R53, is often faulty. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
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) PWM SOT23-6, in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and disappears immediately
In some of these cases, the malfunction is caused by the lack of display backlighting. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then you need to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction, or dual LEds are used, then the PN transition of the emergency zener diode can indirectly serve as an indicator of serviceability. In the event of a malfunction of the LED-a, the PN-transition of the zener diode will either be cut off or broken through in the SC.
- 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 HK-T.SP9202R53 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 - CD25Q32B, NC5CB64M16FP-DH, MN88472 PS331, AD52580, FR9889. Defective components must be replaced.
If there is no tuning to channels of terrestrial or cable television, you should make sure that the software is correct, as well as in accordance with the nominal supply voltages at the NoName tuner terminals. 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 self-repair the SUPRA STV-LC40T400FL TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40T400FL V1N11, Main: HK-T.SP9202R53, Panel: 14Y_40VNBSR2LV0.1
The appearance of the MainBoard HK-T.SP9202R53 is shown in the figure below:HK-T.SP9202R53
Main features of SUPRA STV-LC40T400FL device:
Installed matrix (LED panel) 14Y_40VNBSR2LV0.1.
Matrix management uses the Timing Controller (T-CON) 14Y_EF11_TA2C2LV0.1.
To power the backlight LEDs, a converter is used, combined with the main board HK-T.SP9202R53, controlled by the OB3350CP 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 microcircuits.
MainBoard - the main board (motherboard) is an HK-T.SP9202R53 module using CD25Q32B, NC5CB64M16FP-DH, MN88472 PS331, AD52580, FR9889 and others.
Tuner NoName provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC40T400FL with LCD 14Y_40VNBSR2LV0.1, diagonal size 40 "(102 cm) 16: 9 format. The required screen brightness of 300 cd / m2 is provided by LED backlighting. Dynamic contrast ratio of 100000: 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.The TV capabilities provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution in the standard 1080p (Full HD ) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, MKV, JPEG.
Speaker power of 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, audio x2, component, SCART, VGA, HDMI x3, USB. 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, 1280x1024, 1360x768, 1920x1080. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Dimensions: With stand 932x603x230 mm, Without stand 932x560x88 mm.
Attention! Panel 14Y_40VNBSR2LV0.1 LED TV SUPRA STV-LC40T400FL 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.