Technical description and composition of the TV SUPRA STV-LC1937WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC1937WL
Chassis / Version: CV182L-B
Panel: LM185WH2-TLA1
MainBoard: CV182L-B
IC MainBoard: CPU - MST6E182VG-LF-Z1, Flash - W25Q32BVS
Tuner: CDT3SP512-37
STV-LC1937WL Specifications
SUPRA STV-LC1937WL
General recommendations for TV LCD LED repair
It is advisable to carry out external examination of external and internal elements in a timely manner before the start of operations for their dismantling. In some cases, visible external damage to elements can suggest directions for troubleshooting and localization of a defect even before the necessary measurements are taken at the control points of electronic circuits. Experienced repairers often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external indirect signs.
If the power supply module malfunctions, external manifestations may be different, for example, the SUPRA STV-LC1937WL 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. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to 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 controller microcircuit or breaks in resistors in its strapping.
Sometimes the SUPRA STV-LC1937WL TV has no picture, but there is sound, or the picture appears and disappears immediately. In this case, there is a high probability of malfunction of the LM185WH2-TLA1 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 when there is no backlight, it becomes necessary 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.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source.
If the CV182L-B motherboard is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes it is possible to check the health of the MB only by replacing it.
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU - MST6E182VG-LF-Z1, Flash - W25Q32BVS with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect a malfunction of the tuner CDT3SP512-37, first of all, you need to make sure that there is a supply voltage on the corresponding output of the tuner.
It should be remembered! Attempts to repair the SUPRA STV-LC1937WL TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC1937WL, Main: CV182L-B, Panel: LM185WH2-TLA1
The 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 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 supply of the LCD panel 5V or 12V, 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).
Main features of SUPRA STV-LC1937WL device:
Installed matrix (LED-panel) LM185WH2-TLA1.
The required supply voltage for all nodes of the TV SUPRA STV-LC1937WL provides a switching power supply.
MainBoard - the main board (motherboard) is a CV182L-B module, using CPU chips - MST6E182VG-LF-Z1, Flash - W25Q32BVS and others.
The CDT3SP512-37 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM185WH2-TLA1
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, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 1.1 / 3.9 (Tr / Td)
Frequency: 60Hz
Lamp Type: 3 strings WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC1937WL with LCD LM185WH2-TLA1, diagonal size 19 "(48 cm) 16: 9 format. The required brightness of the screen 240 cd / m² is provided by LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1000: 1. Dynamic contrast ratio of 20,000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the plot.In this model, an LED panel with an end arrangement of backlighting LEDs, Edge LED, is used. Resolution 1366x768 pixels in the standard of graphic decomposition 720p (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 standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, 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, component, SCART, VGA, HDMI, USB. 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.
The power consumed by the TV in operating mode from the network is 35 W.
Overall dimensions: 462x338x152 mm.
Mass of the TV: 2.9 kg.
Attention! The LM185WH2-TLA1 panel of a SUPRA STV-LC1937WL 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.
