Technical description and composition of the SUPRA STV-LC19571WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC19571WL
Chassis / Version: JUG7.820.1199-3
Panel: 720p HD, 1366x768
MainBoard: JUG7.820.1199-3
IC MainBoard: Flash 25Q32
Tuner: CDT-3FP212-34
Technical Specifications STV-LC19571WL
SUPRA STV-LC19571WL
General recommendations for TV LCD LED repair
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should inspect all the internal components of the SUPRA STV-LC19571WL TV, as well as the external elements of the case. Visible damage to elements can sometimes indicate the direction of the search for a defect even before the necessary measurements are taken. In some cases, faulty elements can be seen with the naked eye, for example, carbonized resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldering of the terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In the absence of any signs of operability, when SUPRA STV-LC19571WL does not turn on and does not signal anything with control lamps on the panel, there is a possibility of a malfunction of the TV power supply module. With the same manifestations, the power regulator of the control processor on the motherboard 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.
It should be borne in mind that in the practice of repair, it is extremely rare for key transistors in switching power supplies (SMPS) to fail without reasons that should be looked for by checking other components, for example, a key breakdown can provoke faulty elements of damper circuits, or dried electrolytic capacitors or broken primary resistors power supply circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
If the SUPRA STV-LC19571WL has no picture, but there is sound and the TV is controlled from the remote control, a malfunction is likely in the backlight circuits of the 720p HD, 1366x768 panel. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when the TV is turned on, an image appears and immediately disappears. First of all, you need to make sure that the electrolytic capacitors of the rectifier filter supplying the LED driver are in good working order, and check the LEDs by connecting those that are known to be working for diagnostics.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
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.
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).
In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its Flash 25Q32 chips and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
If you suspect a malfunction of the CDT-3FP212-34 tuner, first of all, you need to make sure that there is a supply voltage at the corresponding output of the tuner.
Attention! For users and owners of STV-LC19571WL TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC19571WL, Main: JUG7.820.1199-3, Panel: 720p HD, 1366x768
The appearance of the MainBoard JUG7.820.1199-3 is shown in the figure below:JUG7.820.1199-3
Main features of SUPRA STV-LC19571WL device:
Installed matrix (LED panel) 720p HD, 1366x768.
The required supply voltage for all nodes of the TV SUPRA STV-LC19571WL provides a switching power supply.
MainBoard - the main board (motherboard) is a JUG7.820.1199-3 module, using Flash 25Q32 chips and others.
The tuner CDT-3FP212-34 provides the reception of television programs and tuning to channels.
LED TV SUPRA STV-LC19571WL with LCD, diagonal 19 "(48 cm) in 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 600: 1 Dynamic contrast ratio of 20,000: 1 is achieved by special control of the LEDs depending on the lighting in the plot. in the standard of graphic decomposition 720p (HD Ready) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported file formats multimedia: MP3, WMA, JPEG.
The power of the sound system 4 W (2x2 W) provide two speakers. It uses the NICAM stereo signal processing system and Sound Surround.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, 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 30 W.
Overall dimensions: 513x394x110 mm.
TV weight: 4.3 kg.
Attention! SUPRA STV-LC19571WL LED TV panel 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.