Technical description and composition of the SUPRA STV-LC40LT0020F TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC40LT0020F
Chassis / Version: V1S10
Panel: V400HJ6-PE1 C3
LED driver (backlight): integrated into MainBoard
PWM LED driver: SO-16 (OZ9902)
MOSFET LED driver: TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: SOIC-8pin
MOSFET Power: TO-252
MainBoard: 5800-A3M12G-0P10
IC MainBoard: SPI Flash 25Q64
Tuner: LY NoName
STV-LC40LT0020F Specifications
SUPRA STV-LC40LT0020F
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SUPRA STV-LC40LT0020F does not turn on, indicators on the front panel do not light or flash. The TV does not respond to control buttons and the remote control.
A malfunction in such cases should be looked for primarily in the circuit of a switching power supply (SMPS) - a mains voltage converter (AC / DC), which is combined with the MainBoard 5800-A3M12G-0P10 main board in this model. It is necessary to measure its output supply voltages, and in their absence, check the serviceability of the power switches (TO-252) of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, 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 often cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers SO-8, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- No picture, sound, all other TV functions work. When turned on, the image may sometimes appear for a second.
Usually, in such cases, a malfunction is detected in the nodes of the backlight of the LED panel. 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.
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 TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the 5800-A3M12G-0P10 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - SPI Flash 25Q64 with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
Before changing the tuner LY NoName, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Owners and users of the SUPRA STV-LC40LT0020F TV should remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that can lead to the complete non-repairability of the device!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC40LT0020F V1S10, Main: 5800-A3M12G-0P10, Panel: V400HJ6-PE1 C3
The appearance of the MainBoard 5800-A3M12G-0P10 is shown in the figure below:5800-A3M12G-0P10
Main features of SUPRA STV-LC40LT0020F device:
Installed matrix (LED panel) V400HJ6-PE1 C3.
To power the backlight LEDs, a converter combined with the 5800-A3M12G-0P10 main board is used, controlled by the SO-16 PWM controller (OZ9902). 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 SOIC-8pin microcircuits and TO-252 power switches.
MainBoard - the main board (motherboard) is a 5800-A3M12G-0P10 module, using SPI Flash 25Q64 chips and others.
Tuner LY NoName provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: INNOLUX
Model: V400HJ6-PE1 Rev.C2
Type: a-Si TFT-LCD, CELL
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: MVA, Normally Black, Transmissive
Active Area: 878.112x485.352 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 5000: 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-LC40LT0020F with LCD V400HJ6-PE1, diagonal 40 "(102 cm) 16: 9 format. The required screen brightness of 280 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. The display technology of the model uses LED LED backlight. The capabilities of the TV provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD). Supported media file formats : MP3, MPEG4, MKV, JPEG.
Speaker power 12 W (2x6 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, HDMI x2, MHL, USB. A headphone output is provided. The digital tuner is capable of receiving TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
Dimensions: with stand 907x578x230 mm, without stand 907x526x88 mm.
TV weight: with stand: 7 kg, without stand: 6.8 kg.
Attention! Panel V400HJ6-PE1 C3 SUPRA LED TV STV-LC40LT0020F 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.