Technical description and composition of the SUPRA STV-LC42T400FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC42T400FL
Chassis / Version: V1N07
Panel: V420HJ-P01 Rev. C2
LED backlight: 303XK420031
T-CON: V420HJ2-XR01
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-220
MainBoard: HK-T.SP9202P53
IC MainBoard: SPI Flash 25Q32
Control: IR: DLED315-18 V4.0
STV-LC42T400FL Specifications
SUPRA STV-LC42T400FL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SUPRA STV-LC42T400FL does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
In such cases, the AC / DC converter of the mains voltage, which is combined with the main board HK-T.SP9202P53, is often faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), the serviceability of the power switches of the converters and rectifier diodes should be checked for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually 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, 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.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
The malfunction in most of these cases is found in the nodes and elements of the LED panel 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.
To check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- The TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the HK-T.SP9202P53 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - SPI Flash 25Q32, which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (indicated by warming up).
We remind users again! Attempts to repair the SUPRA STV-LC42T400FL TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard HK-T.SP9202P53 is shown in the figure below:HK-T.SP9202P53
Main features of SUPRA STV-LC42T400FL device:
Installed matrix (LED panel) V420HJ-P01 Rev. C2.
Matrix control uses Timing Controller (T-CON) V420HJ2-XR01.
A converter combined with a power supply is used to power the backlight LEDs, and is 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 SOT23-6 PWM microcircuits and TO-220 type power switches.
MainBoard - the main board (motherboard) is a HK-T.SP9202P53 module, using SPI Flash 25Q32 chips and others.
SUPRA LED TV STV-LC42T400FL with LCD V420HJ-P01, 42 "(107 cm) 16: 9 diagonal. 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 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 973x640x230 mm, Without stand 973x588x95 mm.
TV weight: 11 kg.
Attention! SUPRA STV-LC42T400FL LED TV panel V420HJ-P01 Rev.C2 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 ................