Technical description and composition of the TV SUPRA STV-LC19T860WL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC19T860WL
Chassis / Version: HK-T.RT2957P65
Panel: LC185TT6A
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: HK-T.RT2957P65
IC MainBoard: CPU RT2957P65, Flash 25Q64
Tuner: TDA18275
Technical Specifications STV-LC19T860WL
SUPRA STV-LC19T860WL
General repair guidelines for TV LCD LED
Possible malfunctions
- The SUPRA STV-LC19T860WL TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In this case, first of all, you should check the operability of the main power source - AC / DC network voltage converter, all of whose elements are located on the MainBoard HK-T.RT2957P65 board. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM SOT23-6 PWM controllers, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights up constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard HK-T.RT2957P65 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements of the CPU RT2957P65, Flash 25Q64 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Once again, remind users! Attempts to self-repair a TV SUPRA STV-LC19T860WL without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC19T860WL, Main: HK-T.RT2957P65, Panel: LC185TT6A
The appearance of the MainBoard HK-T.RT2957P65 is shown in the figure below:HK-T.RT2957P65
HK-T.RT2957P65 can be used in TVs:
SUPRA STV-LC19T860WL (Panel LC185TT6A), SUPRA STV-LC22T860FL (Panel LC215DTCA).
Key Features of SUPRA STV-LC19T860WL:
The matrix (LED panel) LC185TT6A is installed.
To power the backlight LEDs, a converter is used, combined with the main board HK-T.RT2957P65.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is an HK-T.RT2957P65 module, using CPU chips RT2957P65, Flash 25Q64 and others.
The TDA18275 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: PANDA
Model: LC185TT6A
Type: a-Si TFT-LCD, CELL
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)
Glass Depth: 0.50 + 0.50 mm
Contrast Ratio: 600: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC19T860WL with LCD display LC185TT6A, diagonal size 18.5 "(47 cm), 16: 9 format. This model uses a LED panel with an end-mounted LED backlight - Edge LED. You can watch programs and movies and images in high quality HD at a resolution of 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. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound system 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, 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, 1360x768. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: With stand 1235x758x284 mm, Without stand 713x435x86 mm.
TV Weight: 6 kg.
Attention! The LC185TT6A panel of a SUPRA STV-LC19T860WL 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.
