Technical description and composition of the SUPRA STV-LC42590F TV, panel type and modules used. The composition of the modules.SUPRA
Model: STV-LC42590F
Chassis / Version: V2L11
Panel: LC420WUN (SC) (A1)
Lamp backlight: EEFL
T-CON: LC420WUN-SCA1 P / N 6870C-0310C
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9976
MOSFET Inverter: 5NK50
Power Supply (PSU): KIP-L180I14C1-01
PWM Power: FAN7530, FSQ0465
MOSFET Power: 18NK50, 8N50
MainBoard: 35016386 KL420S1000-L-SCV1
IC MainBoard: CPU: MST6E182VSA-LF-Z1, SPI FLASH: W25Q32
Tuner: AFT7-W127
STV-LC42590F Specifications
SUPRA STV-LC42590F
General recommendations for TV LCD repair
Possible manifestations of malfunctions
- SUPRA STV-LC42590F TV does not turn on and does not show any signs of operation at all. No response to the remote control and front panel control buttons.
In such cases, you should start looking for a fault in the circuits of the KIP-L180I14C1-01 power supply. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, the serviceability of the power switches (18NK50, 8N50) and rectifier diodes should be checked for a possible breakdown (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.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FAN7530, FSQ0465 are usually checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and disappears immediately
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.
If, when diagnosing a malfunction, it is required to turn off the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are completed, it is imperative to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the motherboard 35016386 should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU: MST6E182VSA-LF-Z1, 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 heating)
Before changing the tuner AFT7-W127, if it is not possible to tune to television 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
Remember! Attempts to self-repair the SUPRA STV-LC42590F TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> SUPRA STV-LC42590F V2L11, Main: 35016386 KL420S1000-L-SCV1, Panel: LC420WUN (SC)(A1)
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> KIP-L180I14C1-01 Power supply
Main features of SUPRA STV-LC42590F device:Matrix (LCD panel) LC420WUN (SC) (A1) is installed.
Matrix control uses the LC420WUN-SCA1 Timing Controller (T-CON).
A converter combined with a power supply is used to power the backlight lamps, it is controlled by an OZ9976 PWM controller. Keys of 5NK50 type are used as power elements of the inverter.
The formation of the necessary supply voltages for all the nodes of the SUPRA STV-LC42590F TV is carried out by the KIP-L180I14C1-01 power module, or its analogs using FAN7530, FSQ0465 microcircuits and power switches of the 18NK50, 8N50 type.
MainBoard - the main board (motherboard) is a 35016386 module, using CPU chips: MST6E182VSA-LF-Z1, SPI FLASH: W25Q32 and others.
The AFT7-W127 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUN-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: 500 cd / m²
Contrast Ratio: 1500: 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 Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V
LCD TV SUPRA STV-LC42590F with LCD LC420WUN, 42 "(107 cm) 16: 9 diagonal. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio of 100,000: 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, WMA, MPEG4, 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 x2, audio x2, component, VGA, HDMI x3, USB x2. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768.
Dimensions: With stand 1005x672x240 mm, Without stand 1005x620x95 mm.
Attention! The LC420WUN (SC) (A1) panel of the SUPRA STV-LC42590F 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!
