Technical description and composition of the SUPRA STV-LC4214F TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC4214F
Chassis / Version: V1K03
Panel: LC420WUE (SC) (V1)
Lamp backlight: Lamps EEFL
T-CON: 6870C-0310C
Inverter (backlight): integrated into PSU
PWM Inverter: ISL6553
Power Supply (PSU): AYL400207
PWM Power: L6553, LD7575PS
MainBoard: JUG7.820.767-2
IC MainBoard: Video TDA9885TS, Sound STA5598W, SDRAM H5PS5162FFR, Flash AT26DF321, EEPROM 24LC32B
Tuner: CDT-3LC4I1-00
STV-LC4214F Specifications
SUPRA STV-LC4214F
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- SUPRA STV-LC4214F TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up or flash.
With such manifestations, a malfunction is most likely found in the AYL400207 power supply module. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is often cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers L6553, LD7575PS, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
A defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open circuit.
Sometimes it is necessary to disable the inverter protection for diagnostic purposes. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the JUG7.820.767-2 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board needs to be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - Video TDA9885TS, Sound STA5598W, SDRAM H5PS5162FFR, Flash AT26DF321, EEPROM 24LC32B and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Before changing the tuner CDT-3LC4I1-00, if it is not possible to tune to TV channels, you should make sure that there are supply voltages, which must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be monitored with an oscilloscope
Attention to TV owners! Attempts to repair SUPRA STV-LC4214F on your own are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC4214F V1K03 , Main: JUG7.820.767-2, Panel: LC420WUE (SC)(V1)
The appearance of the MainBoard JUG7.820.767-2 is shown in the figure below:JUG7.820.767-2
External view of the power supply
Main features of SUPRA STV-LC4214F device:
Installed matrix (LCD panel) LC420WUE (SC) (V1).
Matrix control uses Timing Controller (T-CON) 6870C-0310C.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by the ISL6553 PWM controller.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC4214F TV is carried out by the AYL400207 power supply module, or its analogs using L6553, LD7575PS microcircuits.
MainBoard - the main board (motherboard) is a JUG7.820.767-2 module, using Video TDA9885TS, Sound STA5598W, SDRAM H5PS5162FFR, Flash AT26DF321, EEPROM 24LC32B and others.
The CDT-3LC4I1-00 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUE-SCV1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Without Driver
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V
SUPRA STV-LC4214F LCD TV with LC420WUE LCD, 42 "(107 cm) 16: 9 diagonal. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) fluorescent lighting. Dynamic contrast ratio 6000: 1 is achieved by a special control of the backlight.Capabilities of the TV provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to the standard 1080p (Full HD) .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 media file formats: MP3, MPEG4, JPEG.
Speaker power 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, audio x4, component x2, SCART x2, RGB, VGA, HDMI x3, USB x2. 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 150 watts.
Overall dimensions: 1132x805x208 mm.
TV weight: 24 kg.
Attention! The LC420WUE (SC) (V1) panel of the SUPRA STV-LC4214F LCD TV is the most expensive component.
Avoid hitting the glass and putting pressure on the screen surface to avoid irreversible damage to the LCD panel!