Technical description and composition of the SUPRA STV-LC42T910FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC42T910FL
Chassis / Version: V1N12
Panel: ELED42-E68 420HVD02.2 XR
T-CON: FT-5542T28C14
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
MOSFET LED driver: B18N20D
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: HK-T.RT2957P60
IC MainBoard: CPU: RTD2957M, SPI FLASH: 25Q64FVSIG,
Tuner: D2837ER
STV-LC42T910FL Specifications
SUPRA STV-LC42T910FL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- TV SUPRA STV-LC42T910FL does not turn on and does not show any signs of turning on, does not respond to control buttons and to the remote control.
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 HK-T.RT2957P60. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (TO-252) and the rectifier diodes of the converters for a possible short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks 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 that can disable it in the 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 and all other functions work. Sometimes, when turned on, the image appears and disappears for a second.
In such cases, the most likely malfunction of the LED panel backlighting elements. The reason can sometimes be in the power supply of the LEDs, but more often in their malfunction (breakdown or breakage), sometimes in the violation of the contact connections of the LED strips.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the HK-T.RT2957P60 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). Repair of the board and replacement of CPU: RTD2957M, SPI FLASH: W25Q64 microcircuits are made with the necessary equipment and the corresponding element base. Malfunctions associated with the use of BGA soldering technologies can be localized by warming up.
Once again, we remind TV users: do not attempt to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC42T910FL, Main: HK-T.RT2957P60, Panel: 1080p Full HD, 1920x1080.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC42T910FL V1N12, Main: HK-T.RT2957P60, Panel: ELED42-E68
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-LC42T910FL device:
Installed matrix (LED-panel) ELED42-E68 420HVD02.2 XR.
Matrix control uses Timing Controller (T-CON) FT-5542T28C14.
To power the backlight LEDs, a converter combined with the HK-T.RT2957P60 main board is used, controlled by the OB3350CP PWM controller. The keys of the B18N20D type 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 PWM SOT23-6 microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a HK-T.RT2957P60 module, using CPU chips: RTD2957M, SPI FLASH: 25Q64FVSIG, and others.
The D2837ER tuner provides television reception and channel tuning.
SUPRA LED TV STV-LC42T910FL with LCD ELED42-E68, 42 "(107 cm) 16: 9 diagonal. The required screen brightness of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 120,000: 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 movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution in 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, 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.
Overall dimensions: 1040x665x160 mm.
Attention! The panel ELED42-E68 420HVD02.2 XR LED TV SUPRA STV-LC42T910FL 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 unrepairable.