Technical description and composition of the SUPRA STV-LC4295FL TV, panel type and modules used. The composition of the modules.SUPRA LED
Model: STV-LC4295FL
Chassis / Version: MSD209
Panel: LC420EUD SCA1
LED backlight: Edge LED
LED driver (backlight): 6917L-0022A 3PHGC10002A-R
Power Supply (PSU): KPS-L180C3-01
PWM Power: FSFM300, FAN7530, FSFR1700
MOSFET Power: 2SK4108
MainBoard: MSD209 * 35014730
IC MainBoard: Flash S25FL128PIF, Audio MSH9000-LF
Tuner: TDTC-G311D
STV-LC4295FL Specifications
SUPRA STV-LC4295FL
General recommendations for TV LCD LED repair
Repair of electronic devices, including the SUPRA STV-LC4295FL TV, is advisable to start with an external inspection of its external and internal elements. Sometimes, based on the 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 begin. 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.
In the case when the STV-LC4295FL does not turn on, does not respond to the remote control and front panel buttons, does not blink lights and does not show any signs of operability, the KPS + L180C3-01 power supply module is probably faulty in this case. If it is working properly with such manifestations, it is necessary to check the processor power regulator (converter) on the motherboard. When repairing the power supply, it is advisable to start diagnostics with checking the mains fuse and electrolytic capacitors of the filters of the converter's secondary rectifiers. In the event of a break in the fuse, the cause should be sought in the power semiconductor elements of the pulse converter of the main power supply unit. It is necessary first of all to check the diodes of the rectifier bridge of the mains voltage and the power switch (s) of the converter.
It should be remembered that in the practice of repair, usually power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the reason that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dry electrolytic capacitors or broken resistors in the primary circuit, or the PWM controller microcircuit itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If SUPRA STV-LC4295FL has no picture, but there is sound and the TV is controlled from the remote control, there is likely a malfunction in the backlight circuits of the LC420EUD SCA1 panel. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when the TV is turned on, an image appears and immediately disappears. First of all, it is necessary to make sure that the electrolytic capacitors of the rectifier filter supplying the LED driver are in good working order, and check the LEDs by connecting those that are known to be working for diagnostics.
A malfunction in the backlight circuits often occurs due to an open circuit in the power supply circuit of the LED lines. It is required to disassemble the panel and check the LEDs themselves, the ration of their outputs, as well as the reliability of the connections in the connectors and the ration of the connector pins.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes.
The MSD209 motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or is on continuously. In such cases, if the converters or power regulators of the microcircuits are working, it may be necessary to update the software.
In some cases it is necessary to check or replace (if necessary) elements of the MB (SSB) board - Flash S25FL128PIF, Audio MSH9000-LF. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
Before replacing the TDTC-G311D tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals.
Attention to the owners! Attempts to repair the SUPRA STV-LC4295FL TV yourself are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> EEPROM SUPRA STV-LC4295FL, Main: MSD209 35014730, Panel: LC420EUD SCA1
The appearance of the MainBoard MSD209 is shown in the figure below:MSD209
External view of the power supply
Main features of SUPRA STV-LC4295FL device:
Installed matrix (LED panel) LC420EUD SCA1.
The LED driver 6917L-0022A is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC4295FL TV is carried out by the KPS-L180C3-01 power module, or its analogs using FSFM300, FAN7530, FSFR1700 microcircuits and 2SK4108 power switches.
MainBoard - the main board (motherboard) is an MSD209 module, using Flash S25FL128PIF, Audio MSH9000-LF and others.
Tuner TDTC-G311D provides reception of TV programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUD-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 5 (G to G), 8 (MPRT)
Frequency: 120Hz + 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 8/10-bit), 100 pins
Voltage: 12.0V
LED TV SUPRA STV-LC4295FL with LCD LC420EUD, 42 "(107 cm) diagonal 16: 9. The required brightness of the screen of 450 cd / m2 is provided by LED backlighting. Dynamic contrast ratio of 80,000: 1 is achieved by special control of LED operation depending on the illumination of the areas in the scene.This model uses an LED-panel with an edge LED backlighting - Edge LED.Possibilities of the TV provide viewing of broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphics decomposition at 1080p (Full HD). The 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 multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 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 x2, audio x3, component, VGA, HDMI x4, USB x2. 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. The digital tuner is capable of receiving TV channels in DVB-T MPEG4 standards.
The power consumed by the TV in operating mode from the network is 135 watts.
Dimensions: With stand 1015x695x255 mm, Without stand 1015x637x47 mm.
Attention! The LC420EUD SCA1 panel of the SUPRA STV-LC4295FL 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 unrepairable ................................ .........