Technical description and composition of the SUPRA STV-LC1515WD TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC1515WD
Chassis / Version: V1J08
Panel: TMS156WX1-01TB
Power Supply (PSU): LK1060-005C
PWM Power: LD7575PS
MOSFET Power: FQPF8N60C
MainBoard: CVMV26L-A-20
IC MainBoard: CPU TSUMV26KE-LF, Flash EON EN25F40 TV, EON EN25T80 DVD
Tuner: F21WT-3BAR-E
STV-LC1515WD Specifications
SUPRA STV-LC1515WD
General recommendations for TV LCD repair
Diagnostics of malfunctions and repair of SUPRA with CVMV26L-A-20 chassis, like other electronic devices, is recommended to begin with an external examination of external and internal elements. Based on visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before taking the necessary measurements. Elements with visible damage, for example, capacitors swollen after the electrolyte boils, charred resistors in certain nodes of the circuit, as well as ring cracks in the solders, will help the master guess about the causes and possible consequences of the malfunction.
If SUPRA STV-LC1515WD does not turn on, no indicator lamps on the front panel will light up or blink, therefore, there is a very high probability of a power module malfunction. In some cases, only the processor power regulator may be faulty. When diagnosing and repairing the power supply, first of all, you should replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is broken, you must identify the cause. Often in such cases an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and transistors in the primary circuit.
The reasons for the breakdown of the power switch in switching power supplies (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of a PWM regulator microcircuit or breaks in resistors in its strapping.
If, when SUPRA STV-LC1515WD is turned on, there is no image, or it appears for a second and disappears altogether, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the common power supply. It should be remembered that when the protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repairs, it is imperative to restore all standard converter protection circuits.
Repair or diagnostics of the CVMV26L-A-20 motherboard should begin with checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software). Complicated MB (SSB) repair is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU TSUMV26KE-LF, Flash EON EN25F40 TV, EON EN25T80 DVD elements requires the necessary training and professional skills in repairing modules at the component level. Problems associated with BGA soldering technologies can be diagnosed by the warm-up method.
The SUPRA STV-LC1515WD has no picture when there is a signal, and it is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) TMS156WX1-01TB, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, to repair the backlight, disassembly of the TMS156WX1-01TB LCD panel is required - a painstaking process that requires increased attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But often the main board MainBoard CVMV26L-A-20 turns out to be faulty, a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for the line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within the normal range, then the oscilloscope should track the passage of LVDS signals from the MainBoard CVMV26L-A-20, as well as synchronizing signals from T-CON to loops with drivers.
Attention to the owners! Attempts to repair the SUPRA STV-LC1515WD TV yourself are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1515WD, Main: CVMV26L-A-20, Panel: 720p HD, 1366x768
CVMV26L-A-20
The CVMV26L-A-20 motherboard uses a TSUMV26KE-LF (TSUMV36KE-LF) processor combined with a scaler, SPI FLASH 520Kb ROM and EEPROM 24C02C.
It is advisable to start repairing the MainBoard with checking the voltage converters and linear stabilizers, which are necessary to provide power in operating and standby modes. Check the power supply of the LCD panel 5V or 12V, depending on the type of panel used, it is necessary to measure directly at the LVDS connector. If, with the necessary supply voltages, the TV does not come out of Stand-by mode, does not respond to the remote control and control buttons, you should update the 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).
External view of the power supply
Main features of SUPRA STV-LC1515WD device:
Installed matrix (LCD panel) TMS156WX1-01TB.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC1515WD TV is carried out by the LK1060-005C power module, or its analogs using LD7575PS microcircuits and FQPF8N60C power switches.
MainBoard - the main board (motherboard) is a CVMV26L-A-20 module, using CPU TSUMV26KE-LF chips, Flash EON EN25F40 TV, EON EN25T80 DVD and others.
The F21WT-3BAR-E tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AVIC
Model: TMS156WX1-01TB 4 Compatible model
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Surface: Antiglare
Brightness: 250 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 60%
Response Time: 2/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV SUPRA STV-LC1515WD with LCD, diagonal size 15 "16: 9. Brightness of the screen of 250 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast - the ratio of maximum to minimum brightness is 500: 1. Dynamic contrast ratio of 1000: 1 is achieved by special control of the backlight.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in a graphic resolution of 720p (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping takes place in 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards Supported multimedia file formats: MP3, WMA, MPEG4, VideoCD, SVCD, JPEG.
The power of the sound system of 6 W (2x3 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, S-Video, SCART, RGB, VGA, HDMI. 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.
The power consumed by the TV in operating mode from the network is 40 watts.
Overall dimensions: 395x320x160 mm.
TV weight: 5 kg.
Attention! The SUPRA STV-LC1515WD LCD TV panel is its most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!