Technical description and composition of the SUPRA STV-LC42K790FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC42K790FL
Chassis / Version: T.MS18VG.72
Panel: T420HW09-V2 // T420HVN04.5
LED driver (backlight): integrated into PSU
PWM LED driver: OB2263
MOSFET LED driver: MDF0765
Power Supply (PSU): LKP-PL088 LK-PL420407A
PWM Power: OB2273, FL7930B (FAN7930B)
MainBoard: T.MS18VG.72 T.VST59.A5
IC MainBoard: CPU TSUMV59XE, Flash 25Q32BVSIG
Tuner: CDT-3NP5i1-10
STV-LC42K790FL Specifications
SUPRA STV-LC42K790FL
General recommendations for TV LCD LED repair
Possible malfunctions
- SUPRA STV-LC42K790FL 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.
Often in such cases, the LKP-PL088 power supply module is 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 OB2273, FL7930B (FAN7930B), in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
As a rule, in such cases there is no display backlight. The reason may be in the breakage of the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings connectors,
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, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the T.MS18VG.72 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 - CPU TSUMV59XE, Flash 25Q32BVSIG with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
The malfunction of the CDT-3NP5i1-10 tuner is established after checking the software and all supply voltages at its terminals. The I2C bus data exchange between the tuner and the processor can be monitored with an oscilloscope.
Attention! Users and owners of STV-LC42K790FL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying 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-LC42K790FL, Main: T.MS18VG.72, Panel: 1080p Full HD, 1920x1080
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC42K790FL, Main: T.MS18VG.72 T.VST59.A5, Panel: T420HW09-V2
The appearance of the MainBoard T.VST59.A5 is shown in the figure below:T.VST59.A5
T.MS18VG.72 can be used in TVs:
SUPRA STV-LC32800AWL (Panel HV320WX2-201 (HK315LEDM-BHA4H)), SUPRA STV-LC32520WL (Panel T320XVN02 001 HK315WLEDM-AHJ8H), SUPRA STV-LC32790WL (Panel HK315LEDM-BH81H(HV320WX2-261)), SUPRA STV-LC46500FL (Panel V460HJ1-PE1), SUPRA STV-LC32510WL (Panel 720p HD 1366x768), SUPRA STV-LC39520FL (Panel V390HJ1-P02 HK390LEDM-CH06H), SUPRA STV-LC32K800WL (Panel HV320WX2-201), SUPRA STV-LC42790FL (Panel HK420LEDM-AH17H), SUPRA STV-LC32K790WL (Panel HK315LEDM), SUPRA STV-LC32520AWL (Panel 720p HD 1366x768), SUPRA STV-LC42K790FL (Panel 1080p Full HD 1920x1080), SUPRA STV-LC32800WL (Panel HK315WLEDM-BHA4A).
External view of the power supply
Main features of SUPRA STV-LC42K790FL device:
Installed matrix (LED panel) T420HW09-V2 or T420HVN04.5.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by the OB2263 PWM controller. The keys of the MDF0765 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC42K790FL TV is carried out by the LKP-PL088 power module, or its analogs using OB2273, FL7930B (FAN7930B) microcircuits.
MainBoard - the main board (motherboard) is a T.MS18VG.72 module, using CPU TSUMV59XE, Flash 25Q32BVSIG and others.
Tuner CDT-3NP5i1-10 provides reception of television programs and tuning to channels ..................
SUPRA LED TV STV-LC42K790FL with LCD T420HW09-V2, 42 "(107 cm) 16: 9 diagonal. The required screen brightness of 350 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 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, 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, 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, 1920x1080.
Dimensions: With stand 970x655x275 mm, Without stand 970x595x55 mm.
TV weight: 12.7 kg.
Attention! SUPRA STV-LC42K790FL LED TV panel T420HW09-V2 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.