Technical description and composition of the TV SUPRA STV-LC1925WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC1925WL
Chassis / Version: V4L02
Panel: MT185GW01 V.1 // CV182L-B // M216H1-L01
T-CON: MT185GW01V1 C1-B
LED driver (backlight): HTX-LP261202
PWM LED driver: MP3389EF
Power Supply (PSU): Adapter 12V 5A
MainBoard: CV182L-B // CVMV26L-B-20
IC MainBoard: TSUMV26KU-LF, F40-100GCP, PWA1517P, 25f40
Tuner: CDT-3SP512-37
Technical Specifications STV-LC1925WL
SUPRA STV-LC1925WL
General repair guidelines for TV LCD LED
Repair of the SUPRA STV-LC1925WL TV should begin with a fault diagnosis, which involves a careful inspection of the external and internal elements of the device. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the HTX-P240202 power supply module fails, the external manifestations may be different, for example, SUPRA STV-LC1925WL does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the filters of the secondary rectifiers (if any), you must first check the mains fuse. When it is broken, the power elements of the transistors and diodes of the rectifier bridge should be checked for avalanche (thermal) breakdown.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If the SUPRA STV-LC1925WL TV does not have an image, but there is sound, a malfunction in the LED backlight circuits is likely. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It is impossible to detect a break in the line of LEDs without disassembling the panel with a simple multimeter. LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
Repair of the CV182L-B motherboard must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
If it is not possible to replace the MB board (SSB), you must check the health of its elements - W25G32BV, YD1517P. Defective components should be replaced.
The malfunction of the CDT-3SP512-37 tuner is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
We recommend the owners of the STV-LC1925WL TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1925WL (Main Board - CVMV26L-B-20)
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1925WL VER.V4L02 CV182L-B W25G32BV
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analogue OB3362VP (28 pin), it is necessary to proportionally increase the total resistance of the resistors from pin 9 (ISET) to the chassis. The maximum current in each of the 12 channels (in milliamps) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. With a parallel connection of channels, the currents are added up.
Repair MainBoardThe appearance of the MainBoard CV182L-B is shown in the figure below:
The CV182L-B motherboard uses the MST6M182VG processor, combined with a scaler and installed using the BGA technology.
It is advisable to start this type of MainBoard repair by checking the voltage converters and linear stabilizers necessary to provide power to the processor nodes: 1.2V, 2.5V, 3.3V. Check the power of the 5V or 12V LCD panel, depending on the type of panel used, it is advisable 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, the SPI Flash software should be updated.
CV182L-B can be used in TVs:
FUSION FLTV-22T9 (Panel TB215WU3), SUPRA STV-LC1925WL (Panel MT185GW01 V.1), SUPRA STV-LC19810WL (Panel TB190B300-A), SUPRA STV-LC1625WLD (Panel B156HW02), SUPRA STV-LC1937WL (Panel LM185WH2-TLA1).
Key Features of SUPRA STV-LC1925WL:
Installed matrix (LED-panel) MT185GW01 V.1 or CV182L-B or M216H1-L01.
The matrix control uses the Timing Controller (T-CON) MT185GW01V1.
The LED driver HTX-LP261202 is used to power the backlight LEDs, it is controlled by the MP3389EF PWM controller.
To power all the internal nodes of the SUPRA STV-LC1925WL TV, an external adapter type 12V 5A is used.
MainBoard - the main board (motherboard) is a CV182L-B module, using TSUMV26KU-LF, F40-100GCP, PWA1517P, 25f40 and other microcircuits.
The tuner CDT-3SP512-37 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: INNOLUX
Model: MT185GW01 V.1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 1.5 / 3.5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S3Px2CN WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC1925WL with LCD display MT185GW01, diagonal size 19 "(48 cm) 16:10 format. The required brightness of the screen is 300 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1500: 1. Dynamic contrast ratio of 20,000: 1 is achieved by special control of the LEDs depending on the illuminance of sections in the plot.The model’s display technology uses LED LED backlighting.You can watch broadcasts and movies and images in high quality HD at a resolution of 1440x900 pixels in the standard 720p graphic resolution (HD Ready). 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. Supported media file formats: MP3, JPEG. Stereo audio implemented by two built-in speakers. Audio NICAM STEREO.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, 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: 459x338x175 mm.
TV Weight: 3.6 kg.
Attention! The MT185GW01 V.1 panel of a SUPRA STV-LC1925WL LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.