Technical description and composition of the TV SUPRA STV-LC1944WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC1944WL
Chassis / Version: V2K12
Panel: V185B1-LE1 Rev. C1
MainBoard: MS6M181.7A (11203)
IC MainBoard: CPU: MST6E181VS-LF-Z1, FLASH: MX25L3205D (U11)
Tuner: CDT-3SP5I2-36
STV-LC1944WL Specifications
SUPRA STV-LC1944WL
General recommendations for TV LCD LED repair
SUPRA STV-LC1944WL TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before starting the necessary measurements. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the power supply module malfunctions, external manifestations may be different, for example, the SUPRA STV-LC1944WL does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the regulator (converter) of the control processor power supply may be faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the mains rectifier filter.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is checked by replacing it with a known good one.
Sometimes the SUPRA STV-LC1944WL TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the V185B1-LE1 Rev. C1 panel backlight LED converter, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the LED driver itself, including the power supply unit (power supply unit).
In most cases of lack of backlight, there is a need to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
It is impossible to check the LED bars for a break without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
When repairing an MB board, you need to check its CPU components: MST6E181VS-LF-Z1, FLASH: MX25L3205D (U11). Defective elements must be replaced. If BGA chips are installed, their failure is usually localized by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the varicaps of the tuner CDT-3SP5I2-36, which is usually within 30-33V, as well as other supply voltages at the terminals of the tuner.
Remember! Attempts to self-repair the SUPRA STV-LC1944WL TV by users without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> Supra STV-LC1944WL (V2K12), Main MS6M181.7A(11203), Panel V185B1-LE1
The appearance of the MainBoard MS6M181.7A is shown in the figure below:MS6M181.7A
MS6M181.7A can be used in TVs:
AKAI LEA-19V07P (Panel M185B3-LC1), AKAI LEA-22V07P (Panel M215HGE-L10 Rev.C1), ERISSON 22LEE01 (Panel CLAA215FA04), ERISSON 16LEE01 (Panel 720p HD 1366x768), FUSION FLTV-D22H11 (Panel LQ215M1LGN2), HYUNDAI H-LED19V13 (Panel CX185LEDM ), HYUNDAI H-LEDVD22V6 (Panel ECG215B3-L01), HYUNDAI H-LED15V7 (Panel N156B6-L0B Rev. C1 / Rev. C2), HYUNDAI H-LEDVD24V10 (Panel M236H3-LA2), RUBIN RB-19S2U (Panel HT185WX1-100), RUBIN RB-22S2UF (Panel LE2360A-V02), RUBIN RB-22S2UFD (Panel 22 "), RUBIN RB-24S2UFD (Panel V236H1-P01), SUPRA STV-LC1944WL (Panel V185B1-LE1 Rev.C1).
Main features of the SUPRA STV-LC1944WL device:
Installed matrix (LED-panel) V185B1-LE1 Rev.C1.
The necessary supply voltages for all nodes of the SUPRA STV-LC1944WL TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is an MS6M181.7A module, using CPU chips: MST6E181VS-LF-Z1, FLASH: MX25L3205D (U11) and others.
The CDT-3SP5I2-36 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: V185B1-LE1
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 (8-bit), CIE1931 70%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 13S8P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC1944WL with LCD display V185B1-LE1, diagonal size 19 "(48 cm) 16: 9 format. The required brightness of the screen 250 cd / m² is provided by LED backlight LED. Dynamic contrast ratio of 20,000: 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.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping takes place in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The NICAM STEREO audio processing system is used.
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. A headphone output 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.
Dimensions: With stand 644x460x165 mm, Without stand 378x289x97 mm.
Attention! The SUPRA STV-LC1944WL LED TV panel V185B1-LE1 Rev. C1 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.