Technical description and composition of the TV SUPRA STV-LC19810WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC19810WL
Chassis / Version: V2L07
Panel: TB190B300-A
LED driver (backlight): integrated into PSU
PWM LED driver: TL494
Power Supply (PSU): HTX-PI240202
PWM Power: PWM SOT23-6 (LD7535 = R7731AGE)
MOSFET Power: 6N60
MainBoard: CV182L-B
IC MainBoard: SPI FLASH W25Q32
Tuner: CDT-3SP512-37
STV-LC19810WL Specifications
SUPRA STV-LC19810WL
General repair guidelines for TV LCD LED
It is advisable to start repairing electronic devices, including the SUPRA STV-LC19810WL TV, with an external examination of its external and internal elements. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in soldering will help the master to guess the causes and possible consequences of the malfunction.
In the case when the STV-LC19810WL does not turn on, does not respond to the remote control and front panel buttons, does not blink lights and does not show any signs of operability, the power module is probably faulty in this case. If it is serviceable with such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. Diagnostics and repair of the general power supply unit should always begin by checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the network rectifier, as well as the large electrolytic capacitor of the filter of the network rectifier.
Mos-Fet switches used in switching power supplies (SMPS) rarely fail without reasons that must be looked for by checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller microcircuit can also cause the breakdown of the power switch of the converter.
If SUPRA STV-LC19810WL has no picture, but there is sound and the TV is controlled from the remote control, there is likely a malfunction in the backlight circuits of the TB190B300-A panel. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
Often, in the absence of backlighting, disassembly of the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of contact connections in the rulers and connectors.
It is impossible to detect a break in the LED line 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.
The motherboard CV182L_B must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power stabilizers of the microcircuit are working, a software update may be necessary.
In some cases, the elements of the MB (SSB) board - SPI FLASH W25Q32 require checking or replacing (if necessary). In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the tuner CDT-3SP512-37, if it is not possible to tune to television channels, make sure that there are supply voltages, including varicap power (30-33V), which must be measured on the corresponding tuner pins.
Remember! Attempts to self-repair by users of the SUPRA STV-LC19810WL TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> HTX-PI240202 Power supply.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC19810WL(V2L07), MAIN CV182L_B, PANEL TB190B300-A
In the event of a failure in the software of the SPI FLASH chip from Winbond, we recommend that you replace it with a new one. Sometimes faulty SPI Winbond microcircuits can be temporarily restored after the soldering station warms up with a hairdryer. This is usually enough to read its contents.
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 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).
The appearance of the power supply
Main features of SUPRA STV-LC19810WL device:
Installed matrix (LED panel) TB190B300-A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a TL494 PWM controller.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC19810WL TV is carried out by the HTX-PI240202 power module, or its analogs using PWM SOT23-6 microcircuits (LD7535 = R7731AGE) and 6N60 power switches.
MainBoard - the main board (motherboard) is a CV182L-B module, using SPI FLASH W25Q32 chips and others.
The CDT-3SP512-37 tuner provides reception of television programs and tuning to channels.
LED TV SUPRA STV-LC19810WL with LCD display TB190B300-A, 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 backlight 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) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal shaping occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, DivX, MKV , JPEG.
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, component, SCART, RGB, VGA, 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, 1360x768.
The power consumed by the TV in the operating mode from the network is 36 watts.
Overall dimensions: 525x370x115 mm.
TV Weight: 5.1 kg.
Attention! The panel TB190B300-A of the SUPRA STV-LC19810WL 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.