Technical description and composition of the SUPRA STV-LC27270FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC27270FL
Chassis / Version: V1L10
Panel: M270H3-L05
MainBoard: CV181H-X
IC MainBoard: CPU: MST6M181VS-LF-Z1; SOUND: TPA3110LD2; SPI FLASH W25Q32; SOUND: TPA3110LD2
Tuner: CDT-3SP512-37
Control: Login to service: INPUT 2580
STV-LC27270FL Specifications
SUPRA STV-LC27270FL
General recommendations for TV LCD LED repair
SUPRA STV-LC27270FL TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Many visible changes in the state of elements make it possible to determine the further direction of troubleshooting and localization of the defect. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred layer of paint on the resistors - all this for the repairman can be a significant clue in assumptions about the causes and consequences of a malfunction.
If the power supply module is faulty, external manifestations may be different, for example, SUPRA STV-LC27270FL does not turn on at all and there is no indication of control lamps on the front panel. With the same symptoms, the regulator (converter) of the control processor power supply may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, the power elements of the transistors and diodes of the rectifier bridge should be checked for avalanche (thermal) breakdown.
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, when turning on the TV, the image appears and immediately disappears, or is absent initially when turned on, but there is sound and other functions work, there is a high probability of a malfunction of the LED driver (the power converter for the backlight LEDs of the M270H3-L05 panel). In such cases, the common power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
In most cases when there is no backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or more LEDs do not work in one line, therefore, they are punctured and should be replaced.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
In cases of attempts to repair the CV181H-X motherboard, it is necessary to check the operability of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - SPI FLASH W25Q32 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its pins with the board (indicated by warming up).
The malfunction of the CDT-3SP512-37 tuner is established after checking the software and all supply voltages at its terminals, including the supply voltage of the varicaps (30-33V).
Attention! Users and owners of STV-LC27270FL TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC27270FL (V1L10), Main CV181H-X, Panel: M270H3-L05
If a failure occurs in the SPI FLASH software produced by Winbond, we recommend changing the microcircuit to a new one. Often unreadable Winbond microcircuits can temporarily restore their functionality after a strong temperature effect, for example, warming up with a soldering station or a lighter. Sometimes this is enough to read its regular contents.
Additional MainBoard RepairThe appearance of the MainBoard CV181H-X is shown in the figure below:
The CV181H-X motherboard uses the MST6M181VG processor, combined with a scaler and installed using the BGA technology.
It is advisable to start repairing this MainBoard with checking the linear stabilizers and voltage converters required to provide power to the processor units: 1.2V, 2.5V, 3.3V. If there is no image, but the display backlight is in good condition, it is necessary to check the power supply of the LCD panel 5V or 12V, depending on the type of panel used, which is advisable to measure directly on the LVDS connector. If, with the necessary supply voltages, the TV does not come out of Stand-by mode, does not respond to the remote control and control buttons, you should update the SPI Flash software.
CV181H-X can be used in TVs:
IZUMI TLE32H330B (Panel T320XVN01.0), MYSTERY MTV-3210W (Panel LC320WXE SBV2), SUPRA STV-LC27270FL (Panel M270H3-L05).
Main features of SUPRA STV-LC27270FL device:
Installed matrix (LED panel) M270H3-L05.
The necessary supply voltages for all nodes of the SUPRA STV-LC27270FL TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a CV181H-X module, using CPU chips: MST6M181VS-LF-Z1; SOUND: TPA3110LD2; SPI FLASH W25Q32; SOUND: TPA3110LD2 and others.
The CDT-3SP512-37 tuner provides reception of television programs and tuning to channels.
Information from an alternative source:
SUPRA STV-LC27270FL Version V1L1
Panel type (matrix): M270H3-L05 REV. C2
Motherboard: CV181H-X, 25Q32FVSIG, IT6633E-P, SGM330A, TPA3110LD2, Tuner: CDT-3SP512-37
PSU & Invertor: ZD-95 (G) F CQC04001011196 LK-PL270601G, OB3350CP, GR8876A, ME15N10-6
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: M270H3-L05
Type: a-Si TFT-LCD, Panel
Diagonal size: 27.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 597.888x336.312 mm
Surface: Glare (Haze 0%), Hard coating (3H), Reflection 5.0% (Max.)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 0.8 / 2.6) (Tr / Td)
Frequency: 60Hz
Lamp Type: 12S6Px4CN WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
SUPRA LED TV STV-LC27270FL with LCD M270H3-L05, 27 "(69 cm) 16: 9. The required brightness of the screen of 300 cd / m² is provided by LED backlight. Dynamic contrast ratio of 50,000: 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 backlighting LEDs - Edge LED.The TV capabilities provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution in 1080p (Full HD ) .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, MKV, JPEG.
Speaker power of 16 W (2x8 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, 1280x1024, 1360x768, 1920x1080.
Overall dimensions: 654x460x200 mm.
TV weight: 5.7 kg.
Attention! SUPRA STV-LC27270FL LED TV panel M270H3-L05 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.