Technical description and composition of the SUPRA STV-LC40T910FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40T910FL
Chassis / Version: HK-T.RT2957P60
Panel: LSC400HM10-L01
T-CON: 14Y_EF11_TA2C2LV0.1
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: HK-T.RT2957P60
IC MainBoard: CPU: RTD2957M, FLASH: W25Q64
Control: Service Mode: Menu-1-1-4-7
STV-LC40T910FL Specifications
SUPRA STV-LC40T910FL
General recommendations for TV LCD LED repair
Possible malfunctions
- SUPRA STV-LC40T910FL TV does not turn on, does not respond to the remote control and control panel buttons, indicators are off or flashing.
In such cases, the AC / DC mains voltage converter, which is combined with the main board HK-T.RT2957P60, often fails. It is necessary to measure the secondary output supply voltages, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of breakdowns in the secondary circuits, the converter can operate in an emergency mode in a short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can disable it in the key mode, or provoke an excess of the maximum current or voltage values. These can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch can also be PWM (PWM). It is checked only by replacing it with a known good one.
- There is no picture, there is sound, it reacts to the remote control, the channels are switched. In some cases, the image appears when turned on and disappears immediately.
In such cases, the most likely malfunction of the LED panel backlighting elements. 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.
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. By opening the panel, you can check each LED separately. Typically, Chinese multimeters light up one 3-volt LED slightly if the probes are connected to it in the forward direction. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or broken into the K / Z.
- The TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the HK-T.RT2957P60 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). When repairing an MB board, you need to check its components CPU: RTD2957M, FLASH: 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.
Attention! Users and owners of STV-LC40T910FL 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 may lead to the complete non-repairability of the device.
The appearance of the MainBoard HK-T.RT2957P60 is shown in the figure below:HK-T.RT2957P60
HK-T.RT2957P60 can be used in TVs:
SUPRA STV-LC42T910FL (Panel 1080p Full HD 1920x1080), SUPRA STV-LC40T910FL (Panel LSC400HM10-L01).
Main features of SUPRA STV-LC40T910FL device:
Installed matrix (LED panel) LSC400HM10-L01.
Matrix management uses the Timing Controller (T-CON) 14Y_EF11_TA2C2LV0.1.
A converter combined with the HK-T.RT2957P60 main board is used to power the backlight LEDs.
The power module is combined with the MainBoard and is made according to the AC / DC flyback converter circuit.
MainBoard - the main board (motherboard) is an HK-T.RT2957P60 module, using CPU: RTD2957M, FLASH: W25Q64 and others.
SUPRA LED TV STV-LC40T910FL with LCD LSC400HM10-L01, diagonal size 40 "(102 cm) 16: 9. 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 the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, 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. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, 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.
Overall dimensions: 980x590x160 mm.
Attention! The panel LSC400HM10-L01 of the SUPRA STV-LC40T910FL 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.