Technical description and composition of the TV SUPRA STV-LC22T860FL, type of panel and applicable modules. The composition of the modules.SUPRA LED
Model: STV-LC22T860FL
Chassis / Version: HK-T.RT2957P65
Panel: LC215DTCA
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 25Q64BV
Tuner: TDA18275
Technical Specifications STV-LC22T860FL
SUPRA STV-LC22T860FL
General repair guidelines for TV LCD LED
SUPRA STV-LC22T860FL, like other televisions, it is advisable to start repairing from inspection of external and internal elements and modules. Sometimes, according to visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. 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 solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the SUPRA STV-LC22T860FL TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is a failure of the common power module. If it is working properly, it is necessary to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
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-LC22T860FL 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 LC215DTCA backlight LED converter, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It should be remembered that it is not possible to determine the break in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
On the motherboard HK-T.RT2957P65, in the event of a malfunction, you should first check the performance of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU RT2957P65, Flash 25Q64BV with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC22T860FL, Main: HK-T.RT2957P65, Panel: LC215DTCA
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).
Main features of the SUPRA STV-LC22T860FL device:
Installed matrix (LED-panel) LC215DTCA.
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 25Q64BV and others.
The TDA18275 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: PANDA
Model: LC215DTCA
Type: a-Si TFT-LCD, CELL
Diagonal size: 21.5 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 476.64x268.11 mm
Surface: Antiglare, Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.6% (with Polarizer)
Contrast Ratio: 600: 1
Display Colors: 16.7M (8-bit)
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
LED TV SUPRA STV-LC22T860FL with LCD display LC215DTCA, diagonal size 22 "(56 cm) 16: 9 format. The required brightness of the screen 250 cd / m² is provided by LED backlight LED. Dynamic contrast ratio of 60,000: 1 is achieved by special control of the LEDs depending on the illumination of the plot sections, this model uses an LED panel with the end-mounted backlight LEDs - Edge LED. The input high-frequency or video signal is decoded in analogue 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 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), 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, 1280x1024, 1360x768, 1920x1080. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: 560x370x120 mm.
Attention! The LC215DTCA panel of a SUPRA STV-LC22T860FL 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.