Technical description and composition of the SUPRA STV-LC39950FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC39950FL
Chassis / Version: V1M02
Panel: V390HJ1-P02
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: SOIC-7pin
MOSFET Power: TO-252
MainBoard: 35017414 REV-01
IC MainBoard: CPU: MT8227AAKU (BMSL), SPI FLASH: W25Q32
STV-LC39950FL Specifications
SUPRA STV-LC39950FL
General recommendations for TV LCD LED repair
Possible malfunctions
- SUPRA STV-LC39950FL TV does not turn on, does not respond to the remote control and control panel buttons, does not light up or blink indicators.
In this case, first of all, you should check the operability of the main power source - the AC / DC mains voltage converter, all the elements of which are located on the MainBoard 35017414. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches in the converters for a short circuit (TO-252) and rectifier diodes.
In case of breakdowns in the secondary circuits, the converter can operate in a short-circuit mode, and in case of a short circuit in the elements of the primary circuit, the mains fuse is usually 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 regulators (PWM) SOIC-7pin, if they have no visible damage to the case and an outright 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.
Most likely in these cases is a malfunction of the LED backlight. Often the cause of a malfunction is the lack of current in the LED circuit, for example, their open or short circuit, or a violation of the contact connections of the connectors.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
- 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 motherboard 35017414 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 - CPU: MT8227AAKU (BMSL), SPI FLASH: W25Q32. Defective components must be replaced.
Remember! Attempts to self-repair the SUPRA STV-LC39950FL TV, in the absence of the necessary qualifications and experience, are strictly not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC39950FL V1M02, Main: 35017414 REV-01, Panel: V390HJ1-P02
The appearance of MainBoard 35017414 is shown in the figure below:35017414
Main features of SUPRA STV-LC39950FL device:
Installed matrix (LED panel) V390HJ1-P02.
To power the backlight LEDs, a converter combined with the main board 35017414 is used.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using SOIC-7pin microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a 35017414 module, using CPU chips: MT8227AAKU (BMSL), SPI FLASH: W25Q32 and others.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V390HJ1-P02
Type: a-Si TFT-LCD, CELL
Diagonal size: 39 inch
Resolution: 1920x1080, FHD
Display Mode: MVA, Normally Black, Transmissive
Active Area: 853.92x480.33 mm
Surface: Antiglare (Haze 3.5%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.8% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
SUPRA LED TV STV-LC39950FL with LCD V390HJ1-P02, diagonal 39 "(99 cm) in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 100,000: 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 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 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, 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.
The power consumed by the TV in operating mode from the network is 70 watts.
Dimensions: With stand 900x597x240 mm, Without stand 900x542x75 mm.
Attention! SUPRA STV-LC39950FL LED TV panel V390HJ1-P02 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.