Technical description and composition of the TV SUPRA STV-LC2422WD, type of panel and applicable modules. The composition of the modules.SUPRA
Model: STV-LC2422WD
Chassis / Version: CVMV26L-A-20
Panel: Panel
Inverter (backlight): integrated into PSU
PWM Inverter: OP3302CP
Power Supply (PSU): LK-PI220417-039E
PWM Power: GR8876A
MOSFET Power: GR8876A
MainBoard: CVMV26L-A-20
IC MainBoard: CPU: TSUMV26KE-LF, FLASH F40-100GCP, EEPROM: K24C32
Tuner: F21WT-3BAR-E
Technical Specifications STV-LC2422WD
SUPRA STV-LC2422WD
General repair guidelines for TV LCD
Possible malfunctions
- The SUPRA STV-LC2422WD TV does not turn on. There is no reaction to the remote control and to the control buttons from the front panel. Indicator lights do not light or flash.
With such manifestations, in most cases, the LK-PI220417-039E power module is faulty. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode, or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) GR8876A. It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the CVMV26L-A-20 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: TSUMV26KE-LF, FLASH F40-100GCP, EEPROM: K24C32 and replace failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If a tuner F21WT-3BAR-E is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary levels of supply voltage and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Once again, remind users! Attempts to self-repair a SUPRA STV-LC2422WD TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard CVMV26L-A-20 is shown in the figure below:CVMV26L-A-20
The CVMV26L-A-20 motherboard uses the TSUMV26KE-LF processor (TSUMV36KE-LF), combined with a scaler, SPI FLASH 520Kb ROM and EEPROM 24C02C.
It is advisable to start the MainBoard repair by checking the voltage converters and linear stabilizers necessary to provide power in the operating and standby modes. Check the power supply of the 5V or 12V LCD panel, depending on the type of panel used, it is necessary to measure directly on the LVDS connector. If, in the presence of the necessary supply voltage, the TV does not exit Stand-by mode, does not respond to the remote control and control buttons, update SPI Flash software.
CVMV26L-A-20 can be used in TVs:
SUPRA STV-LC1926WD (Panel M185XW01 V0), SUPRA STV-LC1922WD (Panel MT185GW01 V.0), SUPRA STV-LC2222WD (Panel CLAA215FA), SUPRA STV-LC2622WD (Panel MT215DW01), SUPRA STV-LC1626WD (Panel 720p HD 1600x900), SUPRA STV-LC2417F STV-LC2417FD (Panel M236H1-P01), SUPRA STV-LC1515WD (Panel 720p HD 1366x768), SUPRA STV-LC2422W (Panel M236M1-L01), SUPRA STV-LC2422WD (Panel Panel), THOMSON T24C99H CVMV26L-A (Panel M236H1-L01 Rev.C2).
The appearance of the power supply
Main features of the SUPRA STV-LC2422WD device:
Installed matrix (LCD-panel) Panel.
To power the backlight, a converter is used, combined with a power supply, controlled by the OP3302CP PWM controller.
The necessary supply voltages for all nodes of the TV SUPRA STV-LC2422WD are formed by the power module LK-PI220417-039E, or its analogs using microchips GR8876A and power switches of the GR8876A type.
MainBoard - the main board (motherboard) is a CVMV26L-A-20 module, using CPU chips: TSUMV26KE-LF, FLASH F40-100GCP, EEPROM: K24C32 and others.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
SUPRA STV-LC2422WD LCD TV with 24 "(60 cm) LCD display in 16: 9 format. 300 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Contrast - the ratio of maximum brightness to minimum is 1000: 1 Dynamic contrast ratio of 2000: 1 is achieved by special control of the backlight operation.The TV features include viewing programs and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog PAL systems , SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, VideoCD, SVCD, JPEG.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, S-Video, SCART, VGA, HDMI, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV in the operating mode from the network is 60 watts.
Overall dimensions: 660x500x180 mm.
The mass of the TV: 9.3 kg.
Attention! The LCD panel of a SUPRA STV-LC2422WD LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen surface to avoid permanent damage to the LCD panel!