Technical description and composition of the SUPRA STV-LC26740WL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC26740WL
Chassis / Version: KL26GT611-B0E-36YTK
Panel: HT260WX2-101
LED driver (backlight): integrated into MainBoard
PWM LED driver: OZ9902C
MOSFET LED driver: 5A 400V, 1.5A 400V
Power Supply (PSU): integrated into MainBoard
PWM Power: FAN6755W
MOSFET Power: 10N60L-B
MainBoard: KL26GT611
IC MainBoard: MT8227, MX25L3206E, STA333W, TDA18273, SY8009A, FR9888
Tuner: TDA18273
Control: IR: 35016976
STV-LC26740WL Specifications
SUPRA STV-LC26740WL
General recommendations for TV LCD LED repair
Repair of the SUPRA STV-LC26740WL TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Often, based on external signs and the nature of damage to elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before taking the necessary measurements at control points. 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.
In the absence of any signs of operability, when SUPRA STV-LC26740WL does not turn on and does not signal anything with indicator 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 secondary rectifier filter and check the fuse and, if it is broken, the cause must be identified. 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.
As a rule, switches in switching power supplies (SMPS) are quite reliable and rarely fail without reasons that should be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM microcircuit is checked by replacing it with a known good one.
If the SUPRA STV-LC26740WL TV has no picture, but there is sound, a malfunction is likely in the LED backlight circuits of the HT260WX2-101 panel. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the PSU (power supply) for an overestimated ESR.
To check the health of the LEDs and contact connections in their power supply circuit, it is necessary to disassemble the panel.
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.In cases where the LED on the front panel indicates standby or operating mode, and the TV does not turn on and does not respond to buttons and the remote control, there is a possibility that the Flash 25Q32 (MX25L3206E) memory chip is faulty. The Flash manufacturer Winbond is often denied. Firmware included.
When repairing the MB board, you need to check its components MT8227, MX25L3206E, STA333W, TDA18273, SY8009A, FR9888, OZ9902C, FAN6755W. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem is sometimes detected by local heating of the chip.
Remember! Attempts to self-repair the SUPRA STV-LC26740WL TV by users without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> SUPRA STV-LC22740WL, STV-LC26740WL, STV-LC42740FL CPU : MT8227
CHASSIS KL26GT611. KONKA KL32GT615U, LED32F3300C, LED42F3300C (CPU MT8227).
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC26740WL (Main Board - KL26GT611)
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC26740WL (Main Board - KL32GT611) V1M03
The appearance of the MainBoard KL26GT611 is shown in the figure below:KL26GT611
Main features of SUPRA STV-LC26740WL device:
Installed matrix (LED panel) HT260WX2-101.
To power the backlight LEDs, a converter is used, combined with the main board KL26GT611, controlled by the OZ9902C PWM controller. The power elements of the LED driver are 5A 400V, 1.5A 400V keys.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using FAN6755W microcircuits and 10N60L-B power switches.
MainBoard - the main board (motherboard) is a KL26GT611 module, using microcircuits MT8227, MX25L3206E, STA333W, TDA18273, SY8009A, FR9888 and others.
The TDA18273 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: BOE
Model: HT260WX2-101
Type: a-Si TFT-LCD, CELL
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 7.05% (with Polarizer)
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LED TV SUPRA STV-LC26740WL with LCD HT260WX2-101, 26 "(66 cm) 16: 9. 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) The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported media file formats: MP3, MKV, JPEG.
Speaker power of 10 W (2x5 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, component, VGA, HDMI x3, USB. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV in operating mode from the network is 45 watts.
Dimensions: With stand 613x423x212 mm, Without stand 613x382x59 mm.
Attention! The panel HT260WX2-101 of the SUPRA STV-LC26740WL LED TV is an expensive and unreliable element.
Do not allow any impacts on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV non-repairable.