Technical description and composition of the SUPRA STV-LC30550WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC30550WL
Chassis / Version: KL29GT616
Panel: V290BJ1-XC01
LED driver (backlight): integrated into MainBoard
PWM LED driver: OCP8121
Power Supply (PSU): integrated into MainBoard
PWM Power: FAN6755
MainBoard: KL29GT616-CMI-78YTK
IC MainBoard: CPU: MT8227, SPI Flash: 25Q32, SOUND: STA333W, IT6633E-P
Tuner: TDA18273 (NXP18273)
STV-LC30550WL Specifications
SUPRA STV-LC30550WL
General recommendations for TV LCD LED repair
Possible manifestations of defects
- SUPRA STV-LC30550WL 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.
In such cases, the common power supply is often faulty - the AC / DC converter of the mains voltage, which is combined with the elements of the KL29GT616 main board. 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 and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, 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 most often cut off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) PWM SOT23-6 are usually checked by replacing them with new ones, or knowingly working.
- 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.
Usually, in such cases, a malfunction is detected in the nodes of the backlight of the LED panel. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
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, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the KL29GT616 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).
Before changing the tuner NoName, if it is not possible to tune to television 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
Attention! Users and owners of STV-LC30550WL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC30550WL, Main: KL29GT616, Panel: V290BJ1
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC30550WL VERSION V1N05, V1M11 Main: KL29GT616, Panel: V290BJ1-XC01
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC30550WL VERSION V1M12 Main: E148158 RH-K4 KB-6150, Panel: V290BJ1-XC01, SPI: 25Q32BV
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC30550WL VERSION V1M10 Main: KL29GT616-CMI-78YTK, Panel: V290BJ1-PE1
Main features of SUPRA STV-LC30550WL device:Installed matrix (LED panel) V290BJ1-XC01.
To power the backlight LEDs, a converter combined with the KL29GT616-CMI-78YTK main board is used, controlled by the OCP8121 PWM controller.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using FAN6755 microcircuits.
MainBoard - the main board (motherboard) is a KL29GT616-CMI-78YTK module, using CPU chips: MT8227, SPI Flash: 25Q32, SOUND: STA333W, IT6633E-P and others.
Tuner TDA18273 (NXP18273) provides reception of television programs and tuning to channels.
SUPRA LED TV STV-LC30550WL with LCD V290BJ1-XC01, diagonal size 30 "(76 cm) 16: 9. The required screen brightness of 250 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 80000: 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.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) The 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, MKV, JPEG.
Speaker power of 10 W (2x5 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, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
Dimensions: With stand 660x440x180 mm, Without stand 660x405x98 mm.
Attention! The panel V290BJ1-XC01 of the SUPRA STV-LC30550WL 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.