Technical description and composition of the TV SUPRA STV-LC2422W, type of panel and applicable modules. The composition of the modules.SUPRA
Model: STV-LC2422W
Chassis / Version: CVMV26L-A-20
Panel: M236M1-L01
Inverter (backlight): with integrated PSU
PWM Inverter: OP3302CP
MOSFET Inverter: ME4946
Power Supply (PSU): LK-PI220417-039E
PWM Power: GR8876A
MainBoard: CVMV26L-A-20
IC MainBoard: CPU TSUMV26KE-LF, Flash K24C32
Tuner: F21WT-3BAR-E
Technical Specifications STV-LC2422W
SUPRA STV-LC2422W
General repair guidelines for TV LCD
Possible manifestations of defects
- The SUPRA STV-LC2422W 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.
In such cases, the LK-PI220417-039E power supply is usually 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip GR8876A can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after their completion, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The indicator blinks or lights up constantly, the TV does not turn on, 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). Board repair and replacement of CPU chips TSUMV26KE-LF, Flash K24C32 are carried out with the necessary equipment, and the corresponding element base. Faults associated with the use of BGA processor soldering technology can be localized by the heating method.
Before changing the F21WT-3BAR-E tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
TV users and owners must remember that attempts to self-repair a SUPRA STV-LC2422W TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC2422W, Main: CVMV26L-A-20, Panel: M236M1-L01
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-LC2422W device:
Installed matrix (LCD panel) M236M1-L01.
To power the backlight, a converter is used, combined with a power supply, controlled by the OP3302CP PWM controller. As power elements of the inverter, keys of the type ME4946 are used.
The necessary supply voltages for all nodes of the TV SUPRA STV-LC2422W are generated by the power module LK-PI220417-039E, or its analogs using GR8876A microcircuits.
MainBoard - the main board (motherboard) is a CVMV26L-A-20 module, using CPU chips TSUMV26KE-LF, Flash K24C32 and others.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
LCD TV SUPRA STV-LC2422W with LCD M236H1, diagonal size 24 "(60 cm), 16: 9 format. The brightness of the screen is 300 cd / m² with fluorescent lights CCFL (EEFL). 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. TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
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. 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 M236H1-L01 REV.C2 panel of a SUPRA STV-LC2422W 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!
